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CCNA It Infrastructure Questions

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1

Multi-Selectmedium

A technician is selecting a storage solution for a home server that requires fast access speeds and redundancy against a single drive failure. Which TWO technologies should be considered?

Select 2 answers

A.SSD

B.Cloud storage

C.HDD

D.RAID 1

E.RAID 0

AnswersA, D

SSDs offer fast read/write speeds compared to HDDs.

Why this answer

SSD (Solid State Drive) provides fast access speeds due to its use of NAND flash memory, which eliminates mechanical seek times and rotational latency found in HDDs. This makes it ideal for a home server requiring rapid data retrieval. RAID 1 (mirroring) writes identical data to two drives, offering redundancy against a single drive failure by allowing the system to continue operating if one drive fails.

Exam trap

The trap here is that candidates often confuse RAID 0 with RAID 1, mistakenly thinking RAID 0 provides redundancy because it improves performance, or they overlook that SSDs are necessary for fast access speeds, assuming HDDs are sufficient for a home server.

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2

MCQhard

A network technician observes that a DHCP server is not issuing IP addresses to clients. The DHCP server is running on a Windows Server with a static IP of 192.168.1.10. Clients are on the same subnet. Which of the following should the technician check FIRST?

A.Whether the DHCP Server service is running

B.Whether the DHCP scope is full

C.Whether a router is forwarding DHCP broadcasts

D.Whether the clients have a wireless connection

AnswerA

The DHCP service must be active to lease IP addresses.

Why this answer

The most fundamental check when a DHCP server fails to issue IP addresses is whether the DHCP Server service itself is running. If the service is stopped, the server cannot respond to any DHCP Discover messages, regardless of scope configuration or network topology. Since the clients are on the same subnet, no router forwarding is required, making service status the logical first step.

Exam trap

The trap here is that candidates jump to scope exhaustion or router configuration issues, forgetting that the most basic service-level check is the first step in any troubleshooting methodology.

How to eliminate wrong answers

Option B is wrong because a full DHCP scope would prevent new leases but the server would still respond with a DHCPNAK; the service must be running to send any response. Option C is wrong because clients are on the same subnet as the DHCP server, so DHCP broadcasts do not need to cross a router; checking router forwarding is irrelevant here. Option D is wrong because the question states clients are on the same subnet and does not mention wireless issues; a wireless connection problem would manifest as no link, not a DHCP-specific failure.

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3

MCQeasy

A small office has five desktop computers that need to be connected to share files and a printer. Which network device should be used to create a local area network?

A.Hub

B.Switch

C.Modem

D.Router

AnswerB

Switches forward data based on MAC addresses, ideal for creating a local network.

Why this answer

A switch is the correct device because it operates at Layer 2 of the OSI model, using MAC addresses to forward frames only to the specific port where the destination device is connected. This creates a dedicated, collision-free path between any two communicating devices, which is essential for a small office LAN where five computers need to share files and a printer efficiently.

Exam trap

The trap here is that candidates often confuse a hub with a switch because both have multiple Ethernet ports, but the hub's lack of intelligence and shared collision domain makes it obsolete for any practical LAN beyond legacy or lab use.

How to eliminate wrong answers

Option A is wrong because a hub operates at Layer 1, simply repeating electrical signals out all ports, which forces all devices to share the same collision domain and halves throughput under load — it is not suitable for a modern LAN. Option C is wrong because a modem (modulator-demodulator) converts digital signals to analog for transmission over telephone or cable lines; it connects a LAN to a WAN (e.g., the internet) but does not create the internal LAN itself. Option D is wrong because a router operates at Layer 3, forwarding packets based on IP addresses and typically connecting different networks; while it can include a built-in switch, a standalone router is overkill and not the primary device for creating a single local network segment.

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4

MCQeasy

A user reports that their computer cannot access the internet, but it can reach other devices on the local network. Which of the following is the MOST likely cause?

A.Incorrect DNS server address

B.Faulty network cable

C.Misconfigured default gateway

D.Local firewall blocking all outbound traffic

AnswerC

Default gateway routes traffic outside the local subnet; a misconfiguration blocks internet access.

Why this answer

The default gateway is the router interface that connects the local network to external networks, such as the internet. If the default gateway is misconfigured (e.g., wrong IP address or subnet mask), the computer can still communicate with devices on the same subnet using ARP and Layer 2 switching, but it cannot route packets to external destinations because it has no valid next-hop address. This directly explains why local access works but internet access fails.

Exam trap

The trap here is that candidates often confuse DNS issues with routing issues, assuming that 'cannot access the internet' automatically means DNS is broken, but the key clue is that local network access still works, which isolates the problem to Layer 3 routing (default gateway) rather than Layer 2 or application-layer issues.

How to eliminate wrong answers

Option A is wrong because an incorrect DNS server address would prevent domain name resolution (e.g., cannot browse by name), but the user could still access the internet by IP address; the question states 'cannot access the internet' generally, not just by name. Option B is wrong because a faulty network cable would cause a complete loss of connectivity, including to other local devices, not just internet access. Option D is wrong because a local firewall blocking all outbound traffic would prevent all outbound connections, including to local devices, unless specifically configured to allow local traffic, which is atypical for a blanket block rule.

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5

MCQeasy

A user reports that their laptop cannot connect to the office Wi-Fi. Other devices connect fine. The technician checks the wireless adapter status in Device Manager and sees a yellow exclamation mark. The technician attempts to update the driver but receives an error that the best driver is already installed. What should the technician do next?

A.Run the Windows Network Troubleshooter

B.Roll back the driver to a previous version

C.Replace the wireless adapter

D.Disable and re-enable the wireless adapter

AnswerB

Rolling back can revert a problematic driver update and restore functionality.

Why this answer

The yellow exclamation mark in Device Manager indicates a driver problem. Since updating the driver fails with 'best driver already installed,' the issue is likely a faulty or incompatible driver version. Rolling back the driver restores the previous working version, which is the correct next step before considering hardware replacement.

Exam trap

The trap here is that candidates assume 'best driver already installed' means the driver is fine, but the yellow exclamation mark explicitly contradicts that, and they overlook the rollback option in favor of generic troubleshooting or hardware replacement.

How to eliminate wrong answers

Option A is wrong because the Windows Network Troubleshooter is a generic tool that cannot resolve driver-level issues indicated by a yellow exclamation mark; it only checks basic connectivity and configuration. Option C is wrong because replacing the wireless adapter is premature; a driver rollback or reinstall should be attempted first, as the adapter may be functional with the correct driver. Option D is wrong because disabling and re-enabling the adapter only resets the software state, not the driver itself, and will not fix a corrupted or incompatible driver.

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6

MCQhard

A company's server room is experiencing intermittent overheating. The administrator notices that the perforated floor tiles are blocked by equipment. What is the most likely consequence of this obstruction?

A.Reduced cooling efficiency and hot spots

B.Increased electrical load on the UPS

C.Increased humidity levels

D.Reduced battery backup time

AnswerA

Perforated tiles deliver cold air; blocking them creates hot spots and reduces cooling.

Why this answer

Blocking perforated floor tiles restricts the flow of cold air from the raised-floor plenum into the server room. This reduces the overall cooling efficiency of the HVAC system and creates localized hot spots around the obstructed tiles, which can lead to equipment overheating and failure.

Exam trap

The trap here is that candidates may confuse airflow obstruction with electrical or power-related issues, but the direct consequence is always thermal—reduced cooling and hot spots—not changes to the UPS or battery system.

How to eliminate wrong answers

Option B is wrong because an increased electrical load on the UPS would result from adding more equipment or increasing power draw, not from obstructing airflow. Option C is wrong because blocked floor tiles reduce airflow, which typically lowers humidity levels (as cold air carries less moisture) or has no direct effect on humidity; increased humidity is more often caused by poor sealing or HVAC malfunction. Option D is wrong because reduced battery backup time is a function of battery age, load, or capacity, not of airflow obstruction in the server room.

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7

MCQeasy

Refer to the exhibit. A user cannot access the internet. What is the most likely issue based on the configuration shown?

A.The default gateway is missing

B.The DNS server is not configured

C.The IP address is invalid

D.The subnet mask is incorrect

AnswerA

Without a default gateway, the device cannot communicate outside its subnet.

Why this answer

The exhibit shows an IP address of 192.168.1.10 with a subnet mask of 255.255.255.0, but no default gateway is configured. Without a default gateway, the device can communicate within its local subnet (192.168.1.0/24) but cannot route traffic to any external network, including the internet. The default gateway is the router's IP address that provides the next-hop path for all off-subnet traffic.

Exam trap

CompTIA often tests the misconception that a missing DNS server prevents internet access entirely, but the real issue is the lack of a default gateway for routing traffic beyond the local subnet.

How to eliminate wrong answers

Option B is wrong because DNS is used for name resolution, not for routing; even without DNS, the user could access the internet by IP address. Option C is wrong because 192.168.1.10 is a valid private IP address within the 192.168.0.0/16 range. Option D is wrong because 255.255.255.0 is the correct subnet mask for a /24 network, matching the IP address 192.168.1.10.

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8

MCQhard

A technician notices that a switch interface is showing many CRC errors. What is the most likely cause?

A.Duplex mismatch

B.Faulty cable

C.Incorrect IP configuration

D.MAC address flooding

AnswerB

CRC errors are often due to damaged cables, poor connections, or electromagnetic interference.

Why this answer

CRC errors indicate that frames received on the interface have failed the cyclic redundancy check, meaning the data has been corrupted during transmission. A faulty cable is the most common cause of such corruption because it can introduce electrical interference, signal degradation, or physical breaks that alter the bits in the frame. While duplex mismatch can cause CRC errors in some cases, a faulty cable is the primary suspect when CRC errors are present.

Exam trap

The trap here is that candidates often associate CRC errors with duplex mismatch because both can appear under high-traffic conditions, but Cisco specifically tests that CRC errors point to physical-layer issues like cabling, while duplex mismatch manifests as late collisions and runts.

How to eliminate wrong answers

Option A is wrong because a duplex mismatch typically causes late collisions and FCS errors, not CRC errors; CRC errors are more directly linked to physical-layer issues like cable faults. Option C is wrong because incorrect IP configuration affects network-layer communication (e.g., routing, addressing) and does not cause physical-layer frame corruption that results in CRC errors. Option D is wrong because MAC address flooding is a security attack that fills the switch's MAC address table, causing frames to be flooded out all ports, but it does not corrupt the frame's data integrity and thus does not produce CRC errors.

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9

MCQhard

After a network upgrade, a user reports that their computer intermittently loses network connectivity. The link light remains on, but the activity light flashes rapidly and irregularly. What is the most likely cause?

A.IP address conflict

B.Bad Ethernet cable

C.Driver corruption

D.Faulty NIC

AnswerB

A bad cable can cause intermittent connectivity and rapid error flashes.

Why this answer

The intermittent connectivity with the link light on but the activity light flashing rapidly and irregularly is a classic symptom of a faulty or marginal Ethernet cable. A bad cable can cause excessive collisions or frame errors, leading to retransmissions that manifest as rapid, irregular activity light flashing while the physical link (link light) remains established. This is distinct from issues like IP conflicts or driver corruption, which typically do not produce this specific link/activity light behavior.

Exam trap

The trap here is that candidates often confuse physical layer symptoms (bad cable) with Layer 2 or Layer 3 issues (IP conflict, driver corruption), assuming that intermittent connectivity must be a software or configuration problem rather than a hardware fault.

How to eliminate wrong answers

Option A is wrong because an IP address conflict would cause complete loss of network access or intermittent connectivity, but it would not cause the activity light to flash rapidly and irregularly while the link light remains on; IP conflicts are a Layer 3 issue and do not affect physical layer indicators. Option C is wrong because driver corruption typically results in the NIC not being recognized or failing to establish a link at all, often with the link light off or flickering erratically, not with a steady link light and rapid activity flashing. Option D is wrong because a faulty NIC usually causes the link light to be off or unstable, or the NIC may fail to initialize entirely; a faulty NIC would not maintain a steady link light while producing rapid, irregular activity flashes.

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10

MCQhard

A technician is troubleshooting a network issue where a client cannot reach a server on a different subnet. The client's IP is 192.168.1.10/24, and the server's IP is 10.0.0.50/24. The client can ping its default gateway. Which device is most likely misconfigured?

A.The client's DNS settings

B.The router between subnets

C.The server's firewall

D.The switch

AnswerB

The router must have a route to the server's subnet; without it, traffic cannot be forwarded.

Why this answer

The client can ping its default gateway, indicating that its local subnet (192.168.1.0/24) connectivity and the gateway's interface are working. However, the client cannot reach a server on a different subnet (10.0.0.0/24). This points to a routing issue: the router between the subnets is likely misconfigured—either missing a route to the 10.0.0.0/24 network or not performing inter-VLAN routing correctly.

Without proper routing, the router drops or fails to forward packets destined for the server's subnet.

Exam trap

CompTIA often tests the misconception that a client's inability to reach a different subnet is due to DNS or the server's firewall, but the key clue is that the client can ping its default gateway, isolating the problem to Layer 3 routing between subnets.

How to eliminate wrong answers

Option A is wrong because DNS settings resolve hostnames to IP addresses, but the client already knows the server's IP (10.0.0.50) and can ping the gateway, so DNS is irrelevant to the subnet reachability issue. Option C is wrong because the server's firewall would only block traffic if packets reached the server; the client cannot even get past the router, so the firewall is not the first point of failure. Option D is wrong because a switch operates at Layer 2 and forwards frames within the same subnet; the client can ping its gateway, proving the switch is correctly forwarding traffic on the local VLAN.

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11

MCQeasy

A small office uses a single ISP-provided modem/router combination device. Employees need to connect their desktops and printers to the network. Which of the following devices would allow them to connect multiple wired devices and also extend wireless coverage?

A.Wireless access point

B.Modem

C.Switch

D.Hub

AnswerA

A wireless access point can extend wireless coverage and often includes a built-in switch for wired connections.

Why this answer

A wireless access point (WAP) connects to the ISP modem/router via Ethernet and bridges the wired LAN to a wireless network, allowing both wired and wireless clients to communicate. In this scenario, the WAP adds additional Ethernet ports for desktops and printers while also extending Wi-Fi coverage beyond the built-in router's range.

Exam trap

The trap here is that candidates confuse a wireless access point with a wireless router, but the question specifies the ISP already provides a modem/router combo, so the correct device is a standalone WAP that adds ports and Wi-Fi without routing functions.

How to eliminate wrong answers

Option B (Modem) is wrong because a modem only converts signals between the ISP and the local network; it typically has a single Ethernet port and does not provide additional wired ports or wireless coverage. Option C (Switch) is wrong because a switch expands the number of wired Ethernet ports but does not include any wireless functionality to extend Wi-Fi coverage. Option D (Hub) is wrong because a hub is a legacy device that repeats all traffic to every port, lacks wireless capability, and is inefficient for modern networks due to collision domains.

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12

MCQeasy

Refer to the exhibit. This JSON policy is associated with an IAM user. Which of the following actions is the user permitted to perform?

A.Download files from example-bucket

B.Upload files to example-bucket

C.Delete files from example-bucket

D.List the contents of example-bucket

AnswerA

s3:GetObject allows downloading.

Why this answer

The JSON policy grants the s3:GetObject action on the arn:aws:s3:::example-bucket/* resource, which allows the user to retrieve (download) objects from the specified S3 bucket. The Effect is set to 'Allow', so the policy explicitly permits this action. No other actions are listed in the Statement, so only downloads are permitted.

Exam trap

The trap here is that candidates often assume that being able to download files implies the ability to list or upload, but AWS IAM policies require explicit permissions for each distinct action, and the absence of s3:ListBucket or s3:PutObject means those actions are denied by default.

How to eliminate wrong answers

Option B is wrong because the policy does not include s3:PutObject, which is required to upload files to an S3 bucket. Option C is wrong because the policy does not include s3:DeleteObject, which is necessary to delete files from an S3 bucket. Option D is wrong because the policy does not include s3:ListBucket, which is needed to list the contents of a bucket (the ListObjects operation).

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13

Multi-Selectmedium

Which TWO of the following are appropriate steps when troubleshooting a user's inability to access the internet? (Select TWO.)

Select 2 answers

A.Check the IP address configuration

B.Restart the computer

C.Ping the default gateway

D.Replace the network cable

E.Power cycle the router

AnswersA, C

Verifies if the workstation has a valid IP.

Why this answer

Option A is correct because checking the IP address configuration is a fundamental first step in troubleshooting network connectivity. A misconfigured IP address, such as an Automatic Private IP Addressing (APIPA) address in the 169.254.x.x range, indicates that the device failed to obtain a valid IP from a DHCP server, which would prevent internet access. Verifying the IP configuration with commands like `ipconfig` (Windows) or `ifconfig` (Linux/macOS) helps identify if the device has a proper IP, subnet mask, and default gateway.

Exam trap

The trap here is that candidates often confuse general troubleshooting steps (like restarting the computer or power cycling the router) with the specific, targeted diagnostic steps required to isolate a network connectivity issue, leading them to select broad actions instead of precise checks like verifying the IP configuration or pinging the default gateway.

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14

Matchingmedium

Match each cable type to its typical use.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts

Matches

Ethernet networks up to 1 Gbps

Ethernet networks up to 10 Gbps

Long distance, high speed

Cable TV and broadband internet

Why these pairings

Common cable types and their applications.

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15

MCQmedium

A user can access the internet and other computers on the network but cannot print to a network printer that is on the same subnet. The printer's IP is 192.168.1.100. What is the most likely cause?

A.The router is not forwarding print jobs

B.The user's computer has a wrong subnet mask

C.The printer's DNS is misconfigured

D.The printer is powered off

AnswerD

A powered-off printer is unreachable, while other network functions work.

Why this answer

Option D is correct because if the printer is powered off, it cannot respond to print jobs, yet the user can still access the internet and other computers on the network since those services are independent of the printer. The printer's IP address (192.168.1.100) being on the same subnet means that connectivity to it relies solely on the printer being powered on and operational at Layer 2 (Ethernet) and Layer 3 (IP). A powered-off printer will not respond to ARP requests or TCP connections, causing print jobs to fail while other network functions remain unaffected.

Exam trap

The trap here is that candidates often assume a network configuration issue (like DNS or subnet mask) is the cause, overlooking the simplest physical-layer problem—a powered-off device—which is a common CompTIA troubleshooting focus.

How to eliminate wrong answers

Option A is wrong because the router is not involved in forwarding print jobs within the same subnet; print traffic between devices on the same subnet is switched at Layer 2, not routed. Option B is wrong because a wrong subnet mask would prevent the user from accessing other computers on the same subnet and likely the internet, as it would cause incorrect routing decisions for local vs. remote destinations. Option C is wrong because DNS is used for name resolution, not for direct IP-based printing; since the printer's IP is known (192.168.1.100), DNS misconfiguration would not prevent a direct TCP/IP print connection.

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16

MCQeasy

A user is trying to print but receives the error shown in the exhibit. Which of the following is the MOST likely cause?

A.Corrupt printer driver

B.Printer is powered off or disconnected from the network

C.Paper jam in the printer

D.Low toner level

AnswerB

An offline status indicates the printer is not reachable.

Why this answer

The error shown in the exhibit (e.g., 'Printer not responding' or 'Offline') typically indicates the printer is powered off or disconnected from the network. When a printer is unreachable on the TCP/IP network, the print spooler cannot establish a connection to the printer's IP address or hostname, resulting in this error. This is the most common cause before investigating software or consumable issues.

Exam trap

The trap here is that candidates often jump to software or consumable issues (driver, jam, toner) first, but the most basic and frequent cause of a 'not responding' error is the printer being physically off or disconnected from the network.

How to eliminate wrong answers

Option A is wrong because a corrupt printer driver would typically cause print job failures, garbled output, or driver-specific error messages, not a generic 'printer not responding' error that indicates a connectivity issue. Option C is wrong because a paper jam is a hardware error that usually triggers a specific on-printer message or a 'Paper Jam' error in the print queue, not a network connectivity error. Option D is wrong because low toner level would produce a warning about print quality or a 'Low Toner' alert, but the printer would still be online and responsive to network requests.

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17

MCQeasy

A user wants to securely access company resources from a remote location over the internet. Which technology should be used?

AnswerD

VPN encrypts all traffic between the remote user and the corporate network.

Why this answer

A VPN (Virtual Private Network) creates an encrypted tunnel between the user's device and the company's network over the internet, ensuring confidentiality and integrity of data. This allows remote users to securely access internal resources as if they were directly connected to the corporate LAN. Technologies like IPsec or TLS are commonly used to establish this secure connection.

Exam trap

The trap here is that candidates often confuse SSH with a general remote access solution because it provides encryption, but SSH only secures a single terminal session, not full network-layer access to all company resources.

How to eliminate wrong answers

Option A is wrong because HTTP is an unencrypted application-layer protocol used for web browsing, not for secure remote access to company resources. Option B is wrong because SSH provides encrypted remote shell access to individual servers, but it does not create a network-layer tunnel to access multiple company resources across the entire internal network. Option C is wrong because FTP is an unencrypted file transfer protocol that transmits credentials and data in plaintext, lacking the security and network access capabilities required for remote resource access.

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18

Multi-Selecthard

Which THREE of the following are common types of network topologies? (Choose three.)

Select 3 answers

A.Circle

B.Star

C.Bus

D.Ring

E.Square

AnswersB, C, D

Star topology has a central hub.

Why this answer

Star, bus, and ring are three of the most common physical network topologies defined in networking standards. In a star topology, all devices connect to a central switch or hub, which manages traffic and isolates failures to individual links. Bus topology uses a single backbone cable with terminators at both ends, while ring topology passes data sequentially from one node to the next using a token-passing mechanism (e.g., Token Ring per IEEE 802.5).

Exam trap

The trap here is that candidates confuse 'circle' with 'ring' topology, but 'circle' is a non-standard term, while 'ring' is the correct CompTIA-recognized topology name; similarly, 'square' is a distractor with no technical basis in networking.

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19

MCQeasy

A technician is installing a new network in a home office. The devices are spaced far apart, and the technician needs to make long runs of cable. Which of the following cable types is BEST suited for this scenario to minimize signal loss?

A.Cat5e UTP

B.Cat6 UTP

C.Coaxial cable

D.Fiber optic cable

AnswerD

Fiber supports much longer distances (kilometers) without signal degradation.

Why this answer

Fiber optic cable uses light pulses to transmit data, which is immune to electromagnetic interference and can carry signals over much longer distances (often kilometers) without significant attenuation. In a home office with long cable runs, fiber optic cable is the best choice to minimize signal loss compared to copper-based cables.

Exam trap

The trap here is that candidates often choose Cat6 UTP because it is a common, high-performance copper cable, overlooking the fact that all copper twisted-pair cables share the same 100-meter distance limitation and are not designed to minimize signal loss over very long runs.

How to eliminate wrong answers

Option A is wrong because Cat5e UTP is a copper twisted-pair cable that suffers from signal degradation (attenuation) over long runs, typically limited to 100 meters, and is more susceptible to EMI. Option B is wrong because Cat6 UTP, while offering higher bandwidth than Cat5e, still has the same 100-meter distance limitation for reliable signal integrity and is not designed for minimizing signal loss over extended distances. Option C is wrong because coaxial cable, though better shielded than UTP, still uses copper conductors and experiences signal loss over long runs, typically requiring amplifiers or repeaters beyond a few hundred feet, and is not optimized for modern high-speed data networks in a home office.

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20

MCQmedium

Refer to the exhibit. A user reports that they cannot access the internet. Based on the output, which of the following is the MOST likely issue?

A.The router at 192.168.1.1 is down

B.The subnet mask is incorrect

C.The IP address is invalid

D.The DNS suffix is missing

AnswerA

Default gateway unreachable would cause no internet.

Why this answer

The default gateway 192.168.1.1 is unreachable, as shown by the 100% packet loss in the ping output. Without a functional gateway, traffic cannot be routed from the local subnet to external networks, so internet access fails even if the local IP configuration is valid.

Exam trap

Cisco often tests the distinction between local connectivity (IP/subnet valid) and gateway reachability; the trap here is that candidates see a valid IP and subnet and assume the problem is DNS-related, ignoring the failed ping to the default gateway.

How to eliminate wrong answers

Option B is wrong because the subnet mask 255.255.255.0 is standard for a /24 network and matches the IP address 192.168.1.100, so it is not incorrect. Option C is wrong because 192.168.1.100 is a valid private IP address within the 192.168.1.0/24 range and is not invalid. Option D is wrong because a missing DNS suffix would prevent name resolution but would not block internet access if the user uses an IP address; the ping to the gateway fails, indicating a connectivity issue, not a DNS problem.

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21

MCQeasy

A user wants to connect a laptop to a corporate wireless network. What internal component must be present in the laptop?

A.Wireless NIC

B.Cellular modem

C.Infrared port

D.Bluetooth adapter

AnswerA

A wireless NIC enables the laptop to connect to Wi-Fi networks.

Why this answer

A Wireless NIC (Network Interface Card) is the internal component required for a laptop to connect to a corporate wireless network. It contains a radio transceiver that communicates with wireless access points using IEEE 802.11 standards (e.g., 802.11ax), handling frame encapsulation, authentication, and encryption such as WPA3. Without a wireless NIC, the laptop has no physical layer capability to transmit or receive Wi-Fi signals.

Exam trap

The trap here is that candidates confuse Bluetooth and Wi-Fi because both use 2.4 GHz radio frequencies, but Bluetooth is designed for short-range device pairing (e.g., keyboards, mice) and cannot authenticate to a corporate wireless network using 802.1X or WPA3-Enterprise.

How to eliminate wrong answers

Option B (Cellular modem) is wrong because it connects to mobile networks (e.g., 4G LTE, 5G NR) using cellular protocols, not to corporate Wi-Fi infrastructure which relies on IEEE 802.11 standards. Option C (Infrared port) is wrong because it uses IrDA (Infrared Data Association) for short-range, line-of-sight communication at speeds up to 4 Mbps, and cannot connect to standard wireless networks. Option D (Bluetooth adapter) is wrong because it operates on the 2.4 GHz ISM band using Bluetooth protocols (e.g., BR/EDR or BLE) for personal area networking, not for connecting to corporate wireless LANs which require 802.11-compliant hardware.

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22

MCQeasy

Refer to the exhibit. Which of the following components would be used to physically connect the desktop computer to the network?

A.Laptop

B.Network printer

C.Switch

D.Router

AnswerC

Switch connects wired devices in a LAN.

Why this answer

A switch is the correct component because it operates at Layer 2 of the OSI model, using MAC addresses to forward frames between devices on the same local area network (LAN). The desktop computer's Ethernet NIC connects via a twisted-pair cable to a switch port, which provides the physical and data-link layer connectivity required for network communication.

Exam trap

The trap here is that candidates often confuse the router as the primary connection point for all devices, but the router's LAN interface connects to a switch (or switch module) which actually provides the physical ports for end-user devices like desktop computers.

How to eliminate wrong answers

Option A is wrong because a laptop is an end-user computing device, not a network infrastructure component used to physically connect other devices; it would itself connect to the network via a switch or access point. Option B is wrong because a network printer is a peripheral device that connects to the network to provide printing services, not a device that provides physical connectivity for other hosts. Option D is wrong because a router operates at Layer 3 to route traffic between different networks (subnets or VLANs), but the immediate physical connection for a desktop on the same LAN is provided by a switch, not a router.

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23

MCQmedium

A company stores sensitive data and wants to ensure that if a hard drive is stolen, the data cannot be read. Which security measure should be implemented?

A.RAID 1

B.Full disk encryption

C.Antivirus software

D.Strong passwords

AnswerB

Encryption scrambles data so it cannot be read without the key.

Why this answer

Full disk encryption (FDE) encrypts the entire contents of a hard drive, including the operating system, applications, and all data, using algorithms such as AES-256. If the drive is stolen, the data remains unreadable without the decryption key or passphrase, even if the drive is physically removed and attached to another system. This directly addresses the requirement of protecting data at rest on a stolen drive.

Exam trap

The trap here is that candidates confuse data-at-rest protection (encryption) with access control (passwords) or redundancy (RAID), mistakenly thinking that strong passwords or RAID alone can prevent data exposure from a stolen drive.

How to eliminate wrong answers

Option A is wrong because RAID 1 (mirroring) provides fault tolerance by duplicating data across two or more drives, but it does not encrypt the data; a stolen drive from a RAID 1 array still contains readable data. Option C is wrong because antivirus software detects and removes malicious software but does not protect data confidentiality if the drive is physically stolen; it operates at the application layer, not on encrypted storage. Option D is wrong because strong passwords protect access to the operating system or user accounts, but they do not encrypt the drive; an attacker can bypass the password by removing the drive and reading its contents directly via a different system.

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24

MCQeasy

A small business with 50 employees currently hosts its email and file-sharing server on-premises on a single physical server. The server is experiencing frequent hardware failures, causing downtime and data loss. The owner wants a solution that improves reliability, scalability, and reduces the need for in-house maintenance. The company has a limited IT budget and wants to avoid large upfront hardware costs. The owner is concerned about data security and compliance but is open to cloud solutions. As an IT consultant, which of the following would be the best recommendation?

A.Implement a regular backup strategy

B.Migrate to a public cloud IaaS solution

C.Purchase a more powerful on-premises server

D.Move to a peer-to-peer network

AnswerB

IaaS offers scalable, reliable infrastructure with pay-as-you-go pricing, reducing the need for in-house hardware maintenance.

Why this answer

Option A is correct because migrating to a public cloud IaaS solution provides scalability, high availability, and reduces maintenance overhead without large upfront costs. Option B is incorrect because purchasing a more powerful server does not eliminate the hardware failure risk; it only delays the problem. Option C is incorrect because backup alone does not prevent downtime; it only enables recovery after an outage.

Option D is incorrect because a peer-to-peer network lacks centralized management and reliability, making it unsuitable for a 50-user business.

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25

MCQhard

A company's IT department received multiple complaints from employees working on the third floor of an office building. They report that their wireless connections drop frequently and internet access is very slow. The network administrator performs a site survey and discovers that there are over 20 wireless access points (APs) in the vicinity, most operating on channels 1, 6, and 11. The company's AP is a dual-band 802.11ac device currently configured to use the 2.4 GHz band on channel 6. The administrator also notes that the company's AP is placed on a metal shelf near an elevator shaft. Which of the following actions should the administrator take to most significantly improve the wireless performance?

A.Change the AP to use the 5 GHz band

B.Relocate the AP away from the metal shelf and elevator

C.Increase the AP's transmission power

D.Change the AP channel to 1

AnswerA

The 5 GHz band has more channels and less congestion, significantly improving performance.

Why this answer

The 2.4 GHz band is heavily congested with over 20 APs on channels 1, 6, and 11, causing co-channel interference and frequent drops. Switching to the 5 GHz band on the dual-band 802.11ac AP provides many more non-overlapping channels (up to 23 with DFS) and significantly less interference, directly addressing the root cause of the slow and unreliable connections.

Exam trap

The trap here is that candidates often focus on physical placement or channel changes within the 2.4 GHz band, overlooking that the fundamental solution in a high-density, interference-saturated environment is to shift to the 5 GHz band, which offers far more spectrum and less congestion.

How to eliminate wrong answers

Option B is wrong because while relocating away from metal and an elevator shaft reduces physical obstructions and multipath interference, it does not solve the primary issue of extreme co-channel interference from 20+ APs on the 2.4 GHz band. Option C is wrong because increasing transmission power on a congested channel (6) would actually worsen interference for other APs and could cause more collisions and retransmissions, degrading performance further. Option D is wrong because changing to channel 1 still keeps the AP in the crowded 2.4 GHz band where all three non-overlapping channels (1, 6, 11) are saturated with over 20 APs, providing no meaningful relief from co-channel interference.

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26

MCQmedium

A user cannot connect to the internet. The network uses DHCP. Based on the exhibit, what is the most likely cause?

A.IP address conflict

B.Incorrect subnet mask

C.No default gateway configured

D.DHCP server is not responding

AnswerD

APIPA occurs when a DHCP server is unavailable, so the DHCP server is likely not responding.

Why this answer

The exhibit shows an APIPA address (169.254.x.x), which indicates that the client failed to obtain a DHCP lease. Since the network uses DHCP, the most likely cause is that the DHCP server is not responding, preventing the client from receiving a valid IP configuration.

Exam trap

The trap here is that candidates may confuse APIPA with a DHCP server issue versus a gateway or subnet problem, but APIPA specifically indicates DHCP server unresponsiveness, not misconfiguration of existing IP settings.

How to eliminate wrong answers

Option A is wrong because an IP address conflict would typically result in a different error message or behavior, not an APIPA address; the client would still have a valid IP from DHCP but with a duplicate address. Option B is wrong because an incorrect subnet mask would not cause the client to self-assign an APIPA address; it would still use the DHCP-assigned IP but with wrong subnetting. Option C is wrong because a missing default gateway would not prevent DHCP lease acquisition; the client would still get an IP address from DHCP but lack a gateway for external traffic.

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27

Multi-Selectmedium

Which TWO of the following are benefits of using virtual machines? (Choose two.)

Select 2 answers

A.They require less software to operate

B.They can be easily migrated between host systems

C.Multiple operating systems can run on a single physical machine

D.They provide inherent security from all threats

E.Virtual machines always run faster than physical machines

AnswersB, C

Migration is a benefit.

Why this answer

Option B is correct because virtual machines are encapsulated into files (such as .vmdk or .vhdx), which include the entire guest OS, applications, and configuration. This encapsulation allows them to be easily migrated between host systems using technologies like vMotion or live migration, enabling load balancing, hardware maintenance, and disaster recovery without downtime.

Exam trap

CompTIA often tests the misconception that virtualization eliminates all security risks or always improves performance, when in reality it introduces new attack surfaces and incurs overhead.

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28

MCQhard

Refer to the exhibit. A technician is troubleshooting connectivity from a PC connected to the 192.168.1.0/24 network. The PC cannot reach the 10.0.0.0/24 network. What is the most likely cause?

A.Incorrect subnet mask on the PC

B.Missing route to 10.0.0.0/24

C.Faulty cable on GigabitEthernet0/1

D.GigabitEthernet0/0 is disabled

AnswerD

The interface is administratively down.

Why this answer

The PC on 192.168.1.0/24 cannot reach 10.0.0.0/24 because GigabitEthernet0/0 is disabled, which is the interface that provides the default gateway or the path to the router. Without an active interface on the local subnet, the PC cannot send any frames to the router, and no traffic can leave the local network. Even if routes exist, a disabled interface prevents all Layer 1 and Layer 2 communication, making connectivity impossible.

Exam trap

CompTIA often tests the concept that a disabled interface on the local subnet is the most fundamental cause of connectivity failure, tricking candidates into focusing on routing or cabling issues on the remote side instead of verifying the local interface status first.

How to eliminate wrong answers

Option A is wrong because an incorrect subnet mask on the PC would affect communication within the 192.168.1.0/24 network or to other subnets, but it would not prevent the PC from sending traffic to its default gateway; the PC would still attempt to forward frames to the router's MAC address. Option B is wrong because a missing route to 10.0.0.0/24 on the router would prevent traffic from being forwarded beyond the router, but the PC could still reach the router's local interface; the issue here is that the PC cannot even send traffic to the router. Option C is wrong because a faulty cable on GigabitEthernet0/1 would affect connectivity to the 10.0.0.0/24 network from the router's perspective, but the PC's inability to reach the router is not caused by a problem on a remote interface; the PC's first hop is through GigabitEthernet0/0.

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29

Multi-Selectmedium

Which THREE of the following are primary functions of a network router?

Select 3 answers

A.Providing wireless access to clients

B.Forwarding packets based on IP addresses

C.Connecting devices within the same local network

D.Performing Network Address Translation (NAT)

E.Assigning IP addresses via DHCP

AnswersB, D, E

Routers make forwarding decisions based on destination IP.

Why this answer

B is correct because a router's primary function is to forward packets between different networks by examining the destination IP address in the packet header and consulting its routing table to determine the best path. This Layer 3 (Network Layer) operation is fundamental to routing, distinguishing it from switches that operate at Layer 2.

Exam trap

CompTIA often tests the distinction between a router's core function (IP forwarding) and its optional features (like NAT, DHCP, or wireless), leading candidates to incorrectly include or exclude options based on common all-in-one device assumptions.

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30

MCQeasy

Which of the following devices is used to connect multiple computers in a local area network and forwards data based on MAC addresses?

A.Router

B.Switch

C.Hub

D.Modem

AnswerB

Switch forwards frames based on MAC addresses.

Why this answer

A switch operates at Layer 2 (Data Link Layer) of the OSI model and uses MAC addresses to make forwarding decisions. It maintains a MAC address table (CAM table) to learn which port each device is connected to, allowing it to forward frames only to the specific destination port, reducing collisions and improving network efficiency.

Exam trap

The trap here is that candidates often confuse a switch with a hub, assuming both simply connect devices, but the key distinction is that a switch uses MAC addresses to intelligently forward traffic while a hub blindly repeats signals to all ports.

How to eliminate wrong answers

Option A is wrong because a router operates at Layer 3 (Network Layer) and forwards data based on IP addresses, not MAC addresses. Option C is wrong because a hub operates at Layer 1 (Physical Layer) and simply repeats electrical signals out all ports without any intelligence to forward based on MAC addresses. Option D is wrong because a modem modulates and demodulates signals for transmission over telephone or cable lines and does not forward data based on MAC addresses.

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31

MCQmedium

A company has a server room with two UPS units, each connected to a separate power circuit. The server room contains 10 servers, each with dual power supplies. One UPS fails and stops providing power. The administrator notices that half of the servers shut down, while the other half remain on. The servers that shut down were all connected to the failed UPS. However, the servers that remained on were also connected to the same UPS via their second power supply. Why did those servers not fail?

A.The servers that shut down were not connected to the working UPS

B.The servers that remained on had both power supplies connected to different UPS units

C.The failed UPS was overloaded and only some servers lost power

D.The servers that remained on had only one power supply connected

AnswerB

Dual power supplies connected to separate UPS units provide redundancy.

Why this answer

Option B is correct because the servers that remained on had each of their dual power supplies connected to different UPS units (one to the failed UPS and one to the working UPS). When one UPS failed, the working UPS continued to supply power through the second power supply, allowing those servers to stay operational. The servers that shut down were only connected to the failed UPS via both power supplies or had their second power supply connected to the same failed UPS, providing no redundancy.

Exam trap

The trap here is that candidates assume all dual-power-supply servers automatically have redundancy, but the question tests the understanding that redundancy only exists if each power supply is connected to a separate, independent power source.

How to eliminate wrong answers

Option A is wrong because the servers that shut down were indeed connected to the working UPS via their second power supply, but the question states they were all connected to the failed UPS, implying they lacked a connection to the working UPS, which is why they failed. Option C is wrong because the scenario describes a UPS failure, not an overload; an overload would cause the UPS to shut down or trip a breaker, but the working UPS continued to power half the servers, indicating no overload condition. Option D is wrong because if the servers that remained on had only one power supply connected, they would have shut down when the UPS they were connected to failed, but they remained on, proving they had both power supplies connected to different UPS units.

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32

Multi-Selectmedium

Which TWO are characteristics of a network switch? (Select exactly two.)

Select 2 answers

A.Operates at Layer 2 of the OSI model

B.Forwards data based on MAC addresses

C.Operates at Layer 3

D.Connects different networks

E.Forwards data based on IP addresses

AnswersA, B

Switches work at the Data Link layer.

Why this answer

A network switch operates at Layer 2 (Data Link Layer) of the OSI model, where it uses MAC addresses to make forwarding decisions. Unlike hubs, switches learn and store MAC addresses in a Content Addressable Memory (CAM) table, allowing them to forward frames only to the specific port associated with the destination MAC address, which reduces collision domains and improves network efficiency.

Exam trap

The trap here is that candidates often confuse a switch's ability to perform some Layer 3 functions (like in a multilayer switch) with the standard definition of a switch, leading them to incorrectly select Layer 3 options when the question explicitly asks for characteristics of a 'network switch' in the context of the CompTIA FC0-U61 exam.

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33

MCQmedium

A user reports that their computer is unable to access the internet, but can access local network resources. Which of the following is the most likely cause?

A.Windows Firewall blocking outbound traffic

B.Incorrect default gateway

C.DNS server not responding

D.Faulty Ethernet cable

AnswerB

The default gateway is needed to route traffic outside the local subnet.

Why this answer

The default gateway is the router that connects a local subnet to other networks, including the internet. If the default gateway is incorrect, the computer can communicate within its own subnet (local resources) but cannot route packets to external networks, causing internet access to fail while local access remains functional.

Exam trap

The trap here is that candidates often confuse DNS resolution with internet connectivity, assuming that if DNS is down, the internet is inaccessible, but the question specifies 'unable to access the internet' (not just resolve names), and local access works, which points to a routing issue at the default gateway.

How to eliminate wrong answers

Option A is wrong because Windows Firewall blocks traffic based on port/protocol rules, not routing; it would block both local and internet traffic if configured to block outbound, not selectively. Option C is wrong because a non-responding DNS server would prevent name resolution (e.g., cannot resolve google.com), but the user could still access the internet via IP address; the symptom here is complete inability to access the internet, not just name resolution failure. Option D is wrong because a faulty Ethernet cable would cause a complete loss of connectivity, including local network resources, not just internet access.

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34

Drag & Dropmedium

Drag and drop the steps to connect a Bluetooth device to a Windows 10 computer into the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

Why this order

Pairing a Bluetooth device requires making it discoverable and adding it via Settings.

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35

MCQmedium

A user reports that their printer is not working. The printer is connected via USB to a workstation, and other users can print to the same printer over the network. Which of the following should the technician check FIRST?

A.Paper jam in the printer

B.USB cable connection

C.Printer driver on the workstation

D.Printer sharing settings on the network

AnswerB

A loose or faulty USB cable would affect only the local user.

Why this answer

Since other users can print to the same printer over the network, the printer itself is operational and reachable. The issue is isolated to the local workstation, making the USB cable connection the most likely point of failure. A loose, damaged, or disconnected USB cable would prevent the workstation from communicating with the printer, so checking the physical connection is the quickest and simplest first step.

Exam trap

The trap here is that candidates often jump to software or network issues (driver or sharing settings) when the problem is actually a simple physical layer failure, ignoring the OSI model's Layer 1 as the first troubleshooting step.

How to eliminate wrong answers

Option A is wrong because a paper jam would affect all users printing to that printer, not just one workstation. Option C is wrong because while a corrupted printer driver could cause local printing issues, it is less likely than a simple physical connection problem and should be checked after verifying the cable. Option D is wrong because printer sharing settings on the network are irrelevant; other users can already print, confirming the network sharing configuration is correct.

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36

MCQeasy

A technician needs to set up a small office network with 15 computers. The computers should be able to communicate with each other and share a single internet connection. Which device is required to enable internet sharing?

A.Modem

B.Hub

C.Router

D.Switch

AnswerC

A router connects multiple networks and provides NAT for internet sharing.

Why this answer

A router is required to enable internet sharing because it performs Network Address Translation (NAT), which allows multiple devices on a local network to share a single public IP address provided by the ISP. The router also routes traffic between the local subnet and the internet, making it the essential device for both inter-device communication and internet access.

Exam trap

The trap here is that candidates often confuse a switch with a router, thinking that a switch can provide internet access because it connects devices, but they overlook that internet sharing requires Layer 3 routing and NAT, which only a router can perform.

How to eliminate wrong answers

Option A is wrong because a modem only converts signals between the ISP's line (e.g., DSL, cable) and the local network; it does not perform NAT or routing, so it cannot enable multiple computers to share a single internet connection. Option B is wrong because a hub operates at Layer 1 (physical layer) and simply repeats electrical signals to all ports; it provides no intelligence for IP addressing, NAT, or internet sharing. Option D is wrong because a switch operates at Layer 2 (data link layer) and forwards frames based on MAC addresses; while it allows local communication between computers, it cannot perform NAT or route traffic to the internet.

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37

MCQmedium

A user reports that their laptop cannot connect to the corporate Wi-Fi network. Other users in the same area are connected without issues. The laptop shows it is connected to the Wi-Fi but has no internet access. Which of the following is the MOST likely cause?

A.Weak Wi-Fi signal

B.SSID broadcast disabled

C.Incorrect IP configuration

D.MAC address filter enabled

AnswerC

Static IP or wrong DHCP settings can cause local connectivity but no internet.

Why this answer

The laptop shows it is connected to Wi-Fi but has no internet access, which indicates that the Layer 3 (network layer) configuration is faulty. An incorrect IP configuration, such as a static IP in the wrong subnet or a failed DHCP lease, prevents the laptop from obtaining a valid default gateway and DNS server, breaking internet connectivity while the Wi-Fi association (Layer 2) remains intact.

Exam trap

The trap here is that candidates confuse a successful Layer 2 association (connected to Wi-Fi) with full Layer 3 connectivity, leading them to choose weak signal or MAC filtering instead of recognizing that the issue is at the IP configuration layer.

How to eliminate wrong answers

Option A is wrong because a weak Wi-Fi signal would cause intermittent disconnections or a very low link quality, not a stable connection with no internet access. Option B is wrong because if the SSID broadcast were disabled, the laptop would not see the network in the scan list and could not connect at all, but the user reports it is connected. Option D is wrong because a MAC address filter enabled would block the laptop from associating with the access point entirely, resulting in a failure to connect to the Wi-Fi, not a connected state with no internet.

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38

Multi-Selecteasy

Which TWO of the following are advantages of server virtualization? (Select TWO.)

Select 2 answers

A.Easier backup and recovery using snapshots

B.Increased security by isolating VMs

C.Eliminates the need for operating system licenses

D.Improved performance over physical servers

E.Better hardware utilization through consolidation

AnswersA, E

Snapshots provide point-in-time recovery.

Why this answer

Option A is correct because server virtualization allows administrators to take snapshots of virtual machines (VMs) at a specific point in time. These snapshots capture the entire VM state, including disk, memory, and power state, enabling quick and consistent backup and recovery without the complexity of traditional physical server backups.

Exam trap

The trap here is that candidates mistakenly believe VM isolation guarantees security (Option B) or that virtualization eliminates OS licensing costs (Option C), when in fact isolation is a feature that requires proper configuration and licensing still applies per VM.

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39

Multi-Selecteasy

Which TWO of the following are types of optical disc storage? (Select exactly two.)

Select 2 answers

A.DVD

B.SSD

C.HDD

D.Flash drive

E.CD

AnswersA, E

Digital Versatile Disc is an optical storage medium.

Why this answer

DVD (Digital Versatile Disc) is a type of optical disc storage that uses a laser to read and write data on a reflective plastic disc. It is a standard optical media format, distinct from magnetic or solid-state storage technologies.

Exam trap

The trap here is that candidates often confuse storage categories, mistakenly classifying SSDs or flash drives as 'optical' because they are removable or used for similar purposes, but the exam strictly tests the physical media type (laser-read vs. magnetic or solid-state).

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40

MCQhard

A technician is configuring a small office network with 15 computers. The computers need to share files and a printer. The technician decides to use a topology where each computer is connected to a central device. Which physical topology is being implemented?

A.Ring

B.Mesh

C.Bus

D.Star

AnswerD

A star topology connects all devices to a central switch or hub.

Why this answer

The star topology connects each computer directly to a central device, such as a switch or hub. This allows all 15 computers to share files and a printer through the central device, making it the correct choice for the described small office network.

Exam trap

The trap here is that candidates often confuse the logical topology (e.g., Ethernet uses a logical bus) with the physical topology, assuming that because Ethernet uses CSMA/CD, it must be a physical bus, but modern Ethernet networks physically use a star topology with switches.

How to eliminate wrong answers

Option A is wrong because a ring topology connects each computer to two neighbors in a closed loop, requiring data to pass through each device sequentially, which does not use a central device. Option B is wrong because a mesh topology connects each computer to every other computer directly, which is impractical and costly for 15 devices and does not rely on a single central device. Option C is wrong because a bus topology uses a single backbone cable with drop lines to each computer, lacking a central device and being prone to collisions and single-point failures.

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41

Multi-Selecteasy

Which TWO of the following are common types of network cables used in wired Ethernet networks?

Select 2 answers

A.HDMI

B.Coaxial

C.Cat5e

D.USB

E.Fiber optic

AnswersC, E

Cat5e is a standard twisted-pair cable for Ethernet networks.

Why this answer

Cat5e (Category 5 enhanced) is a twisted-pair copper cable standard that supports Gigabit Ethernet (1000BASE-T) up to 100 meters. It is one of the most common cable types for wired Ethernet networks because it provides sufficient bandwidth (up to 1000 Mbps) and is backward compatible with older 10/100 Mbps standards.

Exam trap

The trap here is that candidates often confuse coaxial cable's historical use in Ethernet (e.g., 10BASE2) with modern wired Ethernet standards, forgetting that today's common Ethernet deployments use twisted-pair (Cat5e/Cat6) or fiber, not coax.

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42

MCQhard

A technician is setting up a new computer on a network. The computer receives an IP address of 169.254.1.5. Which of the following is the most likely issue?

A.The network cable is faulty

B.The DNS server is unreachable

C.The gateway is misconfigured

D.The DHCP server is unavailable

AnswerD

APIPA is assigned when DHCP is not available.

Why this answer

The IP address 169.254.1.5 falls within the Automatic Private IP Addressing (APIPA) range (169.254.0.0/16), which Windows automatically assigns when a DHCP client fails to receive an IP lease from a DHCP server. This indicates that the DHCP server is either unreachable or not responding, making D the correct answer.

Exam trap

The trap here is that candidates often confuse APIPA with a DNS or gateway problem, but APIPA is a direct indicator of DHCP failure, not name resolution or routing issues.

How to eliminate wrong answers

Option A is wrong because a faulty network cable would typically cause a link light failure or complete lack of connectivity, but the computer still obtained an APIPA address, which requires a functional physical layer to send DHCP discovery broadcasts. Option B is wrong because DNS server unreachability does not prevent DHCP lease assignment; DNS is a separate service used for name resolution after IP configuration is complete. Option C is wrong because a misconfigured gateway affects routing beyond the local subnet, but the computer would still receive a valid DHCP lease if the DHCP server were available; APIPA only occurs when no DHCP server responds.

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43

MCQeasy

A technician needs to verify that a twisted-pair Ethernet cable is wired correctly and has no breaks. Which tool should be used?

A.Multimeter

B.Loopback plug

C.Cable tester

D.Toner probe

AnswerC

Cable testers verify pinouts, continuity, and proper wiring of Ethernet cables.

Why this answer

A cable tester sends signals through each conductor in the twisted-pair cable and checks for continuity, correct pin-to-pin wiring (e.g., T568A or T568B), and shorts or opens. This makes it the correct tool to verify proper wiring and detect breaks in an Ethernet cable.

Exam trap

The trap here is that candidates confuse a multimeter's ability to check continuity with the cable tester's ability to verify correct pairing and wiring standards, leading them to choose the multimeter when only a cable tester can confirm proper Ethernet wiring.

How to eliminate wrong answers

Option A is wrong because a multimeter can only test basic continuity or resistance on individual wires, but it cannot verify correct pairing, split pairs, or the full wiring scheme of an Ethernet cable. Option B is wrong because a loopback plug is used to test the transmit/receive capability of a network interface port, not to check the wiring or integrity of a cable itself. Option D is wrong because a toner probe is used to trace and identify a specific cable within a bundle or patch panel, not to verify wiring correctness or detect breaks.

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44

Multi-Selecthard

A small business is expanding and needs to ensure their network infrastructure supports growth. Which THREE practices should they implement?

Select 3 answers

A.Deploy redundant power supplies for critical devices

B.Implement network segmentation using VLANs

C.Use a single subnet for simplicity

D.Regularly update firmware on networking equipment

E.Use static IP addressing for all devices

AnswersA, B, D

Redundant power supplies increase uptime and reliability.

Why this answer

Redundant power supplies ensure that critical network devices like switches and routers remain operational even if one power supply fails, minimizing downtime during business expansion. This practice directly supports network availability and growth by providing fault tolerance for essential infrastructure components.

Exam trap

The trap here is that candidates may choose 'Use a single subnet for simplicity' thinking it reduces complexity, but it actually hinders scalability and introduces broadcast domain issues that degrade performance in a growing network.

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45

Multi-Selecthard

Which THREE of the following are common methods for securing a wireless network?

Select 3 answers

A.Implementing MAC address filtering

B.Disabling SSID broadcast

C.Enabling WEP encryption

D.Using WPA2 encryption

E.Changing the default IP address range

AnswersA, B, D

Restricts access to allowed devices.

Why this answer

MAC address filtering is a common method for securing a wireless network because it allows the administrator to create an allowlist of specific MAC addresses that are permitted to connect to the access point. This prevents unauthorized devices from associating with the network, even if they know the SSID and password. However, it is not foolproof, as MAC addresses can be spoofed using tools like `macchanger`.

Exam trap

The trap here is that candidates often think WEP is still acceptable for security because it was once a standard, but the exam expects you to know it is deprecated and easily broken, while changing the IP range is a common misconception that offers no real security benefit.

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46

MCQeasy

A small business wants to set up a wireless network. Which of the following is the BEST security method to use?

A.WEP

C.MAC address filtering

D.Disable SSID broadcast

AnswerB

WPA2 provides strong encryption.

Why this answer

WPA2 (Wi-Fi Protected Access 2) is the best security method among the options because it uses AES (Advanced Encryption Standard) with CCMP (Counter Mode CBC-MAC Protocol), providing strong encryption and integrity protection. WEP is outdated and easily cracked, while MAC filtering and disabling SSID broadcast are not encryption methods and offer minimal security against determined attackers.

Exam trap

The trap here is that candidates often confuse security features like MAC filtering or hiding the SSID with actual encryption, thinking they provide strong protection, when in fact they are easily bypassed and do not secure the data in transit.

How to eliminate wrong answers

Option A is wrong because WEP (Wired Equivalent Privacy) uses the flawed RC4 cipher with a static 40- or 104-bit key, making it vulnerable to cracking in minutes with tools like aircrack-ng. Option C is wrong because MAC address filtering only checks the hardware address of the network interface, which can be easily spoofed by an attacker using tools like macchanger, and it does not encrypt traffic. Option D is wrong because disabling SSID broadcast only hides the network name from beacon frames, but the SSID is still transmitted in probe requests and responses, and can be discovered with passive sniffing tools like Kismet.

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47

Drag & Dropmedium

Drag and drop the steps to connect a laptop to a Wi-Fi network in Windows 10 into the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

Why this order

Connecting to Wi-Fi involves selecting the network, entering the password, and optionally saving it.

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48

MCQhard

A company has a server that hosts a critical database. The server uses RAID 5 with three disks. One disk fails. What is the immediate impact on data availability?

A.Data is available only after replacing the disk

B.The server will shut down

C.All data on the array is lost

D.Data is still available, but performance may degrade

AnswerD

RAID 5 uses parity; with one disk missing, reads are slower.

Why this answer

RAID 5 uses block-level striping with distributed parity. With three disks, the array can tolerate a single disk failure without data loss because the parity information on the remaining two disks can reconstruct the missing data on the fly. Therefore, data remains fully available immediately after one disk fails, though read and write performance may degrade due to the overhead of parity calculation and reconstruction.

Exam trap

The trap here is that candidates often confuse RAID 5 with RAID 0, assuming any disk failure causes total data loss, or they mistakenly think the array becomes completely unavailable until the disk is replaced.

How to eliminate wrong answers

Option A is wrong because RAID 5 does not require a replacement disk to maintain data availability; the array continues to operate in a degraded state using parity. Option B is wrong because RAID 5 is designed to survive a single disk failure without shutting down; the server remains operational. Option C is wrong because RAID 5 with three disks provides fault tolerance for one disk failure; data is not lost unless a second disk fails before the first is replaced.

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49

MCQhard

A data center administrator is considering virtualization to consolidate multiple physical servers. Which of the following is the PRIMARY benefit of using virtual machines in this environment?

A.Reduction in the total amount of physical hardware needed

B.Increased performance for each application

C.Improved security by isolating applications

D.Better utilization of physical hardware resources

AnswerD

Consolidation allows multiple workloads on one server, improving resource usage.

Why this answer

The primary benefit of virtualization in a data center is better utilization of physical hardware resources. By running multiple virtual machines on a single physical host, the hypervisor allows the underlying CPU, memory, and storage to be shared efficiently, reducing idle capacity and maximizing the return on hardware investment.

Exam trap

The trap here is that candidates often mistake a desirable outcome (reduced hardware count) for the primary technical benefit, when the exam expects the underlying principle of resource utilization efficiency.

How to eliminate wrong answers

Option A is wrong because while virtualization often leads to a reduction in the total amount of physical hardware needed, that is a secondary outcome of better resource utilization, not the primary technical benefit. Option B is wrong because virtual machines typically introduce a slight performance overhead due to hypervisor abstraction, so they do not increase performance for each application; in fact, performance may be slightly lower than bare-metal. Option C is wrong because while hypervisors provide isolation between VMs, improved security is a secondary advantage, not the primary driver for consolidation; the main goal is resource efficiency.

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50

MCQeasy

A technician runs the commands shown in the exhibit. Based on the output, which of the following can the technician conclude?

A.The computer has internet access

B.The DNS server is reachable

C.The computer can communicate on the local network

D.The default gateway is not configured

AnswerC

Successful ping to gateway indicates local connectivity.

Why this answer

The output shows the computer has an IP address of 192.168.1.10 and a subnet mask of 255.255.255.0, which means it is on the 192.168.1.0/24 local network. The fact that the computer has a valid IP address and subnet mask configured indicates it can communicate with other devices on the same local network segment, as no gateway or external connectivity is required for local link-layer communication.

Exam trap

The trap here is that candidates see the default gateway is present and assume internet access is confirmed, but the gateway's reachability or the presence of a route to the internet is not tested by the given output.

How to eliminate wrong answers

Option A is wrong because the output does not show any successful ping or traceroute to an external IP address or domain, so internet access cannot be confirmed. Option B is wrong because the output does not display any DNS server address or a successful nslookup/dig query, so DNS reachability is not verified. Option D is wrong because the output shows a default gateway of 192.168.1.1, which is configured; the question asks what can be concluded, and the gateway is present, not missing.

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51

MCQmedium

A company wants to ensure that if one hard drive fails, no data is lost. Which RAID level should be implemented?

A.RAID 5

B.RAID 1

C.JBOD

D.RAID 0

AnswerB

RAID 1 mirrors data, so one drive can fail without loss.

Why this answer

RAID 1 (mirroring) writes identical data to two or more drives simultaneously, so if one drive fails, the other contains a complete copy of all data, resulting in zero data loss. This directly meets the requirement that no data is lost upon a single hard drive failure.

Exam trap

The trap here is that candidates often confuse RAID 5 as the 'standard' fault-tolerant RAID and forget that RAID 1 is the simplest and most direct solution for zero data loss with a single drive failure, especially when the question does not specify a minimum number of drives or performance requirements.

How to eliminate wrong answers

Option A is wrong because RAID 5 uses distributed parity across all drives and can tolerate a single drive failure without data loss, but it requires a minimum of three drives and involves parity calculations that can impact write performance; however, the question asks for the simplest and most direct answer for zero data loss with a single drive failure, and RAID 1 is the classic choice. Option C is wrong because JBOD (Just a Bunch Of Disks) provides no redundancy or fault tolerance; if one drive fails, all data on that drive is lost. Option D is wrong because RAID 0 (striping) offers no redundancy; it actually increases the risk of data loss because a single drive failure destroys all data in the array.

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52

MCQhard

Refer to the exhibit. PC1 (192.168.1.10) cannot communicate with PC2 (192.168.2.10). What is the most likely cause?

A.PC2 has an incorrect default gateway

B.Router1 lacks a route to the 192.168.2.0/24 network

C.Switch1 is not routing between VLANs

D.PC1 has an incorrect subnet mask

AnswerB

Without a route to the 192.168.2.0 network, Router1 cannot forward packets to PC2.

Why this answer

Router1 lacks a route to the 192.168.2.0/24 network, so when PC1 sends traffic to PC2, Router1 does not have a destination network entry in its routing table to forward the packets. Without a route, the router drops the packets and may send an ICMP Destination Unreachable message back to PC1. This is the most likely cause because PC1 can reach its default gateway (Router1), but Router1 cannot forward traffic to the remote subnet.

Exam trap

The trap here is that candidates often assume a router automatically knows all networks in a topology, but routers only know directly connected networks unless routes are explicitly configured or learned via a routing protocol.

How to eliminate wrong answers

Option A is wrong because PC2's default gateway is only used when PC2 sends traffic to a different subnet; it does not affect PC1's ability to reach PC2. Option C is wrong because Switch1 is a Layer 2 switch and does not perform routing between VLANs; routing between subnets requires a Layer 3 device like a router. Option D is wrong because if PC1 had an incorrect subnet mask, it would not be able to communicate with its own default gateway or any host on its local subnet, but the problem states PC1 cannot communicate specifically with PC2 on a different subnet, not with its local network.

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53

MCQeasy

Which of the following best describes the function of a DNS server?

A.Hosts web pages

B.Forwards traffic between networks

C.Resolves domain names to IP addresses

D.Assigns IP addresses to devices

AnswerC

DNS performs name resolution.

Why this answer

A DNS (Domain Name System) server translates human-readable domain names (e.g., www.example.com) into machine-readable IP addresses (e.g., 192.0.2.1). This resolution process is fundamental to network communication, as applications rely on IP addresses to locate and connect to servers. Without DNS, users would need to memorize numeric IP addresses for every website or service.

Exam trap

CompTIA often tests the distinction between DNS and DHCP, as candidates frequently confuse 'resolving names' with 'assigning addresses' — both are critical network services but serve entirely different purposes.

How to eliminate wrong answers

Option A is wrong because hosting web pages is the function of a web server (e.g., Apache, Nginx), not a DNS server. Option B is wrong because forwarding traffic between networks is the role of a router (operating at Layer 3 of the OSI model), not a DNS server. Option D is wrong because assigning IP addresses to devices is the function of a DHCP (Dynamic Host Configuration Protocol) server, which uses UDP ports 67 and 68.

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54

Multi-Selecteasy

Which TWO of the following are characteristics of a client-server network?

Select 2 answers

A.No dedicated server required

B.Resources are shared from servers

C.Centralized management

D.All devices are equal

E.Typically used in small offices with few computers

AnswersB, C

Servers host shared resources.

Why this answer

In a client-server network, resources such as files, printers, and applications are hosted on dedicated servers and shared with client devices. This centralized resource sharing is a defining characteristic, as servers are designed to provide services to multiple clients, unlike peer-to-peer networks where each device shares its own resources directly.

Exam trap

CompTIA often tests the misconception that client-server networks can function without a dedicated server, confusing them with peer-to-peer networks where all devices are equal and share resources directly.

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55

MCQmedium

Refer to the exhibit. The user is unable to browse the internet using domain names but can access websites by IP address. Which configuration is most likely incorrect?

A.IPv4 address

C.DNS server addresses

D.DHCP enabled

AnswerC

Public DNS may be blocked or not resolve internal names.

Why this answer

The user can access websites by IP address but not by domain name, which indicates that DNS resolution is failing. The DNS server addresses configuration is most likely incorrect, as the client cannot translate domain names to IP addresses without a valid DNS server. This is a classic symptom of a misconfigured or missing DNS server setting.

Exam trap

The trap here is that candidates often confuse DNS failure with general connectivity issues, but the ability to browse by IP address proves that routing and IP configuration are correct, isolating the problem to DNS server settings.

How to eliminate wrong answers

Option A is wrong because an incorrect IPv4 address would prevent all network communication, including accessing websites by IP address. Option B is wrong because an incorrect subnet mask would cause local network connectivity issues but would not specifically break DNS resolution while allowing direct IP access. Option D is wrong because DHCP being enabled or disabled does not directly cause DNS failure; even with static IP configuration, DNS servers can be manually set correctly.

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56

MCQhard

A server has four hard drives configured in RAID 5. One drive fails. What must the technician do to restore full redundancy?

A.Replace all drives and reconfigure RAID

B.Simply replace the drive with a larger capacity drive

C.Replace the failed drive and rebuild the array

D.Replace the failed drive and restore from backup

AnswerC

RAID 5 can rebuild from parity; replacing the failed drive and initiating rebuild restores fault tolerance.

Why this answer

RAID 5 uses distributed parity across all drives, allowing the array to tolerate a single drive failure without data loss. When a drive fails, the technician must replace the failed drive and then rebuild the array, during which the RAID controller reconstructs the missing data from the parity information on the remaining drives. This restores full redundancy by returning the array to a fault-tolerant state.

Exam trap

The trap here is that candidates may think a simple drive replacement automatically restores redundancy, but they must understand that the array must be explicitly rebuilt (either automatically or manually) to regenerate the missing data from parity.

How to eliminate wrong answers

Option A is wrong because replacing all drives and reconfiguring RAID is unnecessary and causes data loss; RAID 5 can recover from a single drive failure by rebuilding onto a new drive. Option B is wrong because simply replacing the failed drive with a larger capacity drive does not automatically trigger a rebuild, and RAID 5 typically requires drives of the same size; the array must be explicitly rebuilt to restore redundancy. Option D is wrong because restoring from backup is an extreme measure that is not required; RAID 5's parity mechanism allows direct rebuild without backup, and backup should only be used if multiple drives fail or the rebuild fails.

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57

MCQeasy

Which device is used to connect multiple devices within the same network segment and forward data based on MAC addresses?

A.Hub

B.Modem

C.Switch

D.Router

AnswerC

Switches use MAC addresses to forward frames.

Why this answer

A switch operates at Layer 2 (Data Link Layer) of the OSI model and uses MAC addresses to make forwarding decisions. It maintains a MAC address table (CAM table) to learn which port each device is connected to, allowing it to forward frames only to the intended destination port, reducing collisions and improving network efficiency.

Exam trap

The trap here is that candidates often confuse a switch with a hub because both connect multiple devices, but the key distinction is that a switch forwards based on MAC addresses while a hub simply repeats signals without any addressing logic.

How to eliminate wrong answers

Option A is wrong because a hub operates at Layer 1 (Physical Layer) and simply repeats electrical signals out all ports, without any intelligence to read or forward based on MAC addresses. Option B is wrong because a modem (modulator-demodulator) converts digital signals to analog for transmission over telephone or cable lines and does not forward data within a local network segment based on MAC addresses. Option D is wrong because a router operates at Layer 3 (Network Layer) and forwards packets based on IP addresses, not MAC addresses, and is used to connect different network segments or subnets.

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58

MCQeasy

A home user wants to connect a desktop computer to the internet using a wireless connection. The computer does not have built-in Wi-Fi. What is the simplest and most cost-effective solution? The user has a wireless router already installed and working.

A.Install a wireless network adapter (USB or PCIe)

B.Use a powerline adapter to extend the network

C.Replace the computer with a laptop that has Wi-Fi

D.Run an Ethernet cable from the router to the computer

AnswerA

This directly adds Wi-Fi capability to the desktop at low cost.

Why this answer

A wireless network adapter (USB or PCIe) adds Wi-Fi capability to a desktop that lacks it, directly connecting to the existing wireless router. This is the simplest and most cost-effective solution because it requires no new infrastructure or cabling, and USB adapters are plug-and-play with minimal setup.

Exam trap

The trap here is that candidates may overthink the solution and choose a more complex option like powerline adapters or Ethernet, missing that the simplest fix is a low-cost wireless adapter that directly addresses the missing Wi-Fi hardware.

How to eliminate wrong answers

Option B is wrong because a powerline adapter extends the network over electrical wiring, which is more expensive and complex than adding a simple wireless adapter, and still requires a wired connection to the computer. Option C is wrong because replacing the entire computer is far more costly and unnecessary when a $20–$30 adapter solves the problem. Option D is wrong because running an Ethernet cable is a viable solution but is not the simplest or most cost-effective—it involves physical cabling, potential drilling, and is less convenient than a wireless adapter.

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59

MCQhard

A company wants to protect against data loss if a single hard drive fails. They have three identical drives. Which RAID configuration provides fault tolerance while maximizing storage capacity?

A.RAID 0

B.JBOD

C.RAID 1

D.RAID 5

AnswerD

RAID 5 stripes data with parity, allowing one drive to fail without data loss.

Why this answer

RAID 5 uses block-level striping with distributed parity, so if one of the three drives fails, the data can be rebuilt from the remaining drives plus the parity information. With three drives, RAID 5 provides fault tolerance for a single drive failure while using only one drive's worth of capacity for parity, maximizing usable storage (2/3 of total raw capacity).

Exam trap

The trap here is that candidates often confuse RAID 5 with RAID 0 or RAID 1, mistakenly thinking striping alone (RAID 0) provides redundancy or that mirroring (RAID 1) maximizes capacity, when in fact RAID 5 is the only option among these that balances fault tolerance and storage efficiency with three drives.

How to eliminate wrong answers

Option A is wrong because RAID 0 (striping) offers no fault tolerance; if any single drive fails, all data is lost. Option B is wrong because JBOD (Just a Bunch Of Disks) simply concatenates drives without any redundancy or parity, providing no protection against data loss from a single drive failure. Option C is wrong because RAID 1 (mirroring) with three drives would require at least two drives to mirror the same data, wasting capacity (only 1/3 usable) and not maximizing storage; it also typically operates with an even number of drives.

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60

MCQeasy

A user reports that their computer is unable to connect to the internet, but other devices on the same network work fine. Which of the following is the MOST likely cause?

A.Router firewall blocking traffic

B.DHCP server failure

C.DNS server misconfiguration

D.Faulty network cable

AnswerD

A faulty cable can cause connectivity loss for a single device.

Why this answer

A faulty network cable can prevent a single computer from connecting to the internet while other devices on the same network work fine. This is because the cable physically connects the computer to the network switch or router, and if it is damaged, the link may fail entirely or cause excessive packet loss, isolating only that device.

Exam trap

The trap here is that candidates often assume network issues are always logical (e.g., DNS or DHCP) and overlook the physical layer, but CompTIA tests the principle that a single-device failure with others working points to a local physical or configuration problem, not a shared infrastructure fault.

How to eliminate wrong answers

Option A is wrong because a router firewall blocking traffic would affect all devices behind the router, not just a single computer, unless specific MAC or IP filtering is configured, which is less common than a physical cable issue. Option B is wrong because a DHCP server failure would prevent all devices from obtaining IP addresses, causing a network-wide connectivity failure, not an isolated one. Option C is wrong because a DNS server misconfiguration would allow the computer to connect to the network and reach IP addresses directly, but domain name resolution would fail; the user reports no internet connectivity at all, not just name resolution issues.

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61

MCQmedium

A network administrator wants to automatically assign IP addresses to all devices on the network. Which service should be configured on the server?

AnswerB

DHCP dynamically assigns IP addresses and other configuration to devices.

Why this answer

Dynamic Host Configuration Protocol (DHCP) is the correct service because it automatically assigns IP addresses, subnet masks, default gateways, and other network configuration parameters to devices on a network. This eliminates the need for manual static IP configuration and ensures each device receives a unique IP address from a defined pool, preventing address conflicts.

Exam trap

The trap here is that candidates often confuse DHCP with DNS because both are network services, but DNS resolves names to IPs while DHCP assigns IPs to devices.

How to eliminate wrong answers

Option A is wrong because DNS (Domain Name System) resolves human-readable domain names (e.g., www.example.com) to IP addresses; it does not assign IP addresses to devices. Option C is wrong because HTTP (Hypertext Transfer Protocol) is used for transferring web content between clients and servers; it has no role in IP address assignment. Option D is wrong because NAT (Network Address Translation) translates private IP addresses to a public IP address for internet access; it does not automatically assign IP addresses to devices on the local network.

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62

MCQmedium

A technician is troubleshooting a desktop that does not power on. The power supply fan spins, but there is no display and no beep codes. Which component should the technician check first?

A.RAM

B.Motherboard

C.CPU

D.Power supply

AnswerA

Faulty or loose RAM often prevents booting and can be fixed by reseating.

Why this answer

When the power supply fan spins but there is no display and no beep codes, the system is likely failing the Power-On Self-Test (POST) before it can initialize the video subsystem. RAM is the most common cause of a 'no POST' condition because if the memory is faulty, loose, or incompatible, the motherboard cannot complete the memory initialization step, halting the boot process silently without beeps or display.

Exam trap

Cisco often tests the misconception that a spinning power supply fan guarantees the PSU is fully functional, leading candidates to overlook RAM as the first component to check in a no-POST scenario.

How to eliminate wrong answers

Option B (Motherboard) is wrong because a completely dead motherboard would typically prevent the power supply fan from spinning or cause continuous beep codes, not a silent no-POST state; the fan spinning indicates the motherboard is receiving power and the PSU is functional. Option C (CPU) is wrong because a failed CPU usually results in a specific beep code pattern (e.g., continuous short beeps on AMI BIOS) or the system may power on with fans but no POST, but RAM is far more likely to be the first check due to its higher failure rate and ease of reseating. Option D (Power supply) is wrong because the fan spinning confirms the PSU is delivering at least some power; a faulty PSU would typically cause no fan movement or intermittent power, not a clean spin with no POST.

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63

MCQeasy

A user reports that their laptop battery drains quickly even when plugged in. What is the most likely cause?

A.The battery is faulty

B.The laptop is set to high performance mode

C.The power adapter is not delivering enough voltage

D.The CPU is overheating

AnswerC

If the adapter is underpowered, the laptop may supplement with battery power, causing drain.

Why this answer

When a laptop battery drains quickly while plugged in, the most likely cause is that the power adapter is not delivering enough voltage or current to simultaneously power the system and charge the battery. This can occur if the adapter is undersized, damaged, or not the original equipment manufacturer (OEM) specification, causing the system to draw power from the battery even when connected to AC power. A faulty battery would typically fail to hold a charge at all, not drain while plugged in.

Exam trap

The trap here is that candidates often assume a battery drain while plugged in must be a battery fault, but the CompTIA FC0-U61 exam tests understanding that the power adapter's output capacity is the first thing to verify in such a scenario.

How to eliminate wrong answers

Option A is wrong because a faulty battery usually results in no charge retention, sudden shutdowns, or failure to power on, not a gradual drain while the AC adapter is connected. Option B is wrong because high performance mode increases power consumption but does not cause the battery to drain when plugged in; the adapter should still supply sufficient power unless it is inadequate. Option D is wrong because CPU overheating triggers thermal throttling to reduce performance and power draw, which would not cause the battery to drain; it is a symptom of cooling failure, not a power delivery issue.

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64

Multi-Selecthard

A technician is troubleshooting a computer that cannot connect to the network. Which THREE steps should the technician perform first in the troubleshooting process?

Select 3 answers

A.Reinstall the operating system

B.Check if the network cable is securely connected

C.Verify IP address configuration

D.Check link lights on the network adapter

E.Replace the network interface card

AnswersB, C, D

A loose cable is a common cause; checking it is a first step.

Why this answer

Option B is correct because checking the physical connection is the first step in the CompTIA A+ troubleshooting methodology. A loose or damaged network cable is a common cause of connectivity failure, and verifying it eliminates the simplest issue before moving to software or configuration checks.

Exam trap

The trap here is that candidates may jump to software or hardware replacement steps (like reinstalling the OS or replacing the NIC) without first performing basic physical and configuration checks, which are the foundation of systematic troubleshooting.

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65

MCQmedium

A company has two office buildings 1.5 km apart and needs to connect their networks with a high-speed, reliable link. Which cabling type is most appropriate?

A.Cat6a

B.Fiber optic

C.Coaxial

D.Cat5e

AnswerB

Fiber optic supports long distances and high bandwidth, ideal for inter-building connections.

Why this answer

Fiber optic cabling is the most appropriate choice for connecting two office buildings 1.5 km apart because it supports high-speed data transmission over long distances (up to several kilometers) with minimal signal loss and immunity to electromagnetic interference (EMI). Unlike copper-based cables, fiber optic uses light pulses to transmit data, making it ideal for reliable, high-bandwidth links between separate buildings.

Exam trap

The trap here is that candidates often overlook the distance limitation of copper cabling (100 meters for twisted-pair) and assume that higher-category cables like Cat6a can magically extend beyond that range, when in fact the 100-meter rule applies regardless of category for Ethernet standards.

How to eliminate wrong answers

Option A is wrong because Cat6a is a copper twisted-pair cable limited to a maximum segment length of 100 meters for high-speed Ethernet (10GBASE-T), making it unsuitable for a 1.5 km link. Option C is wrong because coaxial cable, while capable of longer distances than twisted-pair, typically supports up to 500 meters for 10BASE5 or 185 meters for 10BASE2, and its lower bandwidth and susceptibility to interference make it inadequate for modern high-speed requirements. Option D is wrong because Cat5e is also a copper twisted-pair cable with a maximum effective distance of 100 meters for 1000BASE-T, and it cannot span 1.5 km without repeaters or switches, which would add cost and complexity.

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66

Multi-Selecteasy

Which THREE are common types of network cables? (Select exactly three.)

Select 3 answers

A.Fiber optic

B.USB

C.HDMI

D.Coaxial

E.Twisted pair

AnswersA, D, E

Fiber optic cable uses light for high-speed data transmission.

Why this answer

Fiber optic cables use light pulses transmitted through glass or plastic fibers to carry data, offering high bandwidth, long-distance transmission, and immunity to electromagnetic interference. They are a standard network cable type in modern infrastructure, especially for backbone and high-speed connections.

Exam trap

The trap here is that candidates often confuse common peripheral or multimedia cables (USB, HDMI) with network cables, forgetting that network cables specifically refer to those used for local area network (LAN) or wide area network (WAN) data transmission, such as fiber optic, coaxial, and twisted pair.

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67

MCQhard

A hospital's IT team manages a virtualized server hosting a patient records database. The server has one physical processor with 6 cores, 32 GB of RAM, and a RAID 5 array of three 1 TB HDDs. The virtual machine (VM) running the database is configured with 2 vCPUs, 8 GB RAM, and a 500 GB virtual disk stored on the RAID array. Users report that database queries are taking much longer than usual. The host server shows CPU utilization at 20%, memory at 60%, and the disk queue length frequently stays above 5. Which of the following is the most likely cause of the performance issue?

A.Disk I/O bottleneck

B.Network bandwidth limitation

C.Insufficient memory

D.Insufficient CPU resources

AnswerA

A high disk queue length indicates that the storage subsystem is overloaded, causing slow response times.

Why this answer

The disk queue length consistently exceeding 5 indicates that I/O requests are waiting for the storage subsystem, which is a classic sign of a disk I/O bottleneck. The RAID 5 array of three 1 TB HDDs provides limited IOPS compared to SSDs, and the single virtual disk on this array cannot keep up with the database workload. Even though CPU and memory utilization are moderate, the high queue length shows the disks are the limiting factor.

Exam trap

CompTIA often tests the misconception that high disk queue length is always caused by insufficient memory, but here memory is adequate and the queue is due to slow HDDs in RAID 5, not paging.

How to eliminate wrong answers

Option B is wrong because network bandwidth limitation would manifest as slow data transfer between clients and the server, not as high disk queue length on the host. Option C is wrong because memory utilization at 60% (with 32 GB total) is not critically low, and insufficient memory would cause paging or swapping, not a persistently high disk queue length. Option D is wrong because CPU utilization at 20% is well below saturation, and 2 vCPUs on a 6-core host are not overloaded; insufficient CPU would show high CPU usage, not a disk queue issue.

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68

Multi-Selectmedium

Which TWO of the following are advantages of using a virtual private network (VPN) for remote employees?

Select 2 answers

A.Eliminates need for antivirus software

B.Provides encrypted communication

C.Allows access to internal resources

D.Reduces hardware costs

E.Increases network bandwidth

AnswersB, C

VPNs encrypt data to ensure confidentiality.

Why this answer

Options B and C are correct. VPNs provide encrypted communication (B) and allow access to internal resources (C). Option A is incorrect because VPNs typically reduce bandwidth due to encryption overhead.

Option D is incorrect because VPNs do not directly reduce hardware costs. Option E is incorrect because a VPN does not eliminate the need for antivirus software.

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69

MCQhard

A technician is diagnosing performance issues in a wireless network. Users report intermittent slowdowns. Which of the following is the MOST likely cause?

A.WPA2 encryption overhead

B.Weak signal from the access point

C.Interference from neighboring networks

D.Incorrect channel width setting

AnswerC

Interference can cause sporadic slowdowns.

Why this answer

Intermittent slowdowns in a wireless network are most commonly caused by co-channel or adjacent-channel interference from neighboring networks. Wi-Fi operates on shared, unlicensed spectrum (2.4 GHz and 5 GHz), and overlapping channels or high utilization from nearby access points force stations to wait for clear channel access, causing latency spikes and throughput drops. WPA2 encryption overhead is negligible for modern hardware, and weak signal or incorrect channel width would typically cause consistent, not intermittent, issues.

Exam trap

The trap here is that candidates confuse 'intermittent slowdowns' with 'weak signal' or 'incorrect channel width,' but CompTIA emphasizes that interference from neighboring networks is the most common cause of sporadic performance issues in dense wireless environments.

How to eliminate wrong answers

Option A is wrong because WPA2 encryption overhead is minimal (typically <5% CPU impact on modern devices) and causes a constant, predictable latency increase, not intermittent slowdowns. Option B is wrong because a weak signal from the access point results in consistently low data rates or frequent disconnections, not intermittent slowdowns that come and go. Option D is wrong because an incorrect channel width setting (e.g., 40 MHz in 2.4 GHz) would cause persistent performance degradation or compatibility issues, not intermittent slowdowns, and is less common than interference as a root cause.

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70

MCQmedium

A user is trying to access a website but receives a 'DNS server not responding' error. Which of the following is the MOST likely cause?

A.DHCP server is down

B.DNS server is unreachable

C.Firewall is blocking the website

D.Modem is disconnected

AnswerB

The error explicitly mentions DNS server.

Why this answer

The 'DNS server not responding' error indicates that the client cannot reach the DNS server to resolve the domain name into an IP address. This is most commonly caused by the DNS server being unreachable due to network connectivity issues, server downtime, or incorrect DNS server configuration. Without DNS resolution, the browser cannot translate the website's URL into an IP address, even if the network and web server are functional.

Exam trap

The trap here is that candidates often confuse DNS resolution failures with network connectivity issues or firewall blocks, but the specific error message points directly to the DNS server being unreachable, not to general network or application-layer problems.

How to eliminate wrong answers

Option A is wrong because a DHCP server being down would prevent the client from obtaining an IP address, subnet mask, or default gateway, but the error message specifically mentions DNS, not IP configuration failure. Option C is wrong because a firewall blocking the website would typically result in a 'connection timed out' or 'access denied' error, not a 'DNS server not responding' error, as DNS resolution occurs before the HTTP request. Option D is wrong because a disconnected modem would cause a complete loss of network connectivity, resulting in a 'no internet access' or 'network cable unplugged' error, not a DNS-specific error.

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71

MCQhard

A small business uses a single external IP address from their ISP and has a network of 10 computers. They want to host a web server that must be accessible from the internet, but they also need to protect their internal network. They have a firewall/router that supports port forwarding. Which configuration should they implement?

A.Connect the web server directly to the ISP modem, bypassing the firewall

B.Place the web server in the DMZ of the firewall and allow all inbound traffic to the server's IP

C.Assign a public IP address to the web server and connect it to the same switch as the other computers

D.Configure port forwarding on the router to direct HTTP (port 80) and HTTPS (port 443) traffic to the web server's internal IP address

AnswerD

This allows external access only to the specified ports while protecting the internal network.

Why this answer

Option D is correct because port forwarding allows the firewall/router to accept incoming HTTP (port 80) and HTTPS (port 443) traffic on the single public IP address and forward it to the web server's internal private IP address. This exposes only the necessary ports to the internet while keeping the web server behind the firewall, protecting the internal network from direct external access.

Exam trap

The trap here is that candidates often confuse the DMZ option (B) as a secure solution, not realizing that a typical SOHO DMZ exposes the host to all inbound traffic, which is far less secure than targeted port forwarding.

How to eliminate wrong answers

Option A is wrong because connecting the web server directly to the ISP modem bypasses the firewall entirely, leaving the server and potentially the internal network unprotected from internet threats. Option B is wrong because placing the web server in the DMZ and allowing all inbound traffic to its IP exposes the server to every port and protocol, defeating the purpose of selective access and increasing the attack surface unnecessarily. Option C is wrong because assigning a public IP address to the web server on the same switch as the other computers would require multiple public IPs (which the business does not have) and would expose the server directly to the internet without firewall protection, compromising the internal network.

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72

MCQhard

An administrator is configuring access to an S3 bucket. The policy is applied to an IAM user. Which of the following actions will the user be allowed to perform?

A.List all objects in my-company-bucket

B.Read and write objects in my-company-bucket

C.Delete objects from my-company-bucket

D.Change the bucket policy of my-company-bucket

AnswerB

The policy grants GetObject and PutObject, which allow reading and writing objects.

Why this answer

The IAM policy applied to the user explicitly grants 's3:GetObject' and 's3:PutObject' actions on the 'my-company-bucket' resource, which correspond to reading and writing objects. This is the only action set permitted by the policy, so the user can read and write objects in the bucket.

Exam trap

The trap here is that candidates often assume an IAM policy applied to a user grants all actions on the bucket by default, but AWS IAM follows a least-privilege model where only explicitly allowed actions are permitted.

How to eliminate wrong answers

Option A is wrong because listing objects requires the 's3:ListBucket' permission, which is not granted in the policy. Option C is wrong because deleting objects requires the 's3:DeleteObject' permission, which is not granted. Option D is wrong because changing the bucket policy requires the 's3:PutBucketPolicy' permission, which is not granted and is typically reserved for bucket owners or administrators.

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73

MCQhard

A small business purchases a cable modem from the ISP. They need to obtain a public IP address to access the internet. Which method does the cable modem typically use?

C.Static assignment

D.APIPA

AnswerB

Cable modems use DHCP to obtain an IP address from the ISP automatically.

Why this answer

Cable modems typically use DHCP to obtain a public IP address from the ISP. When the modem powers on, it sends a DHCPDISCOVER broadcast, and the ISP's DHCP server responds with an IP address, subnet mask, default gateway, and DNS server information. This is the standard method for dynamically assigning public IP addresses to customer premises equipment (CPE) in cable networks.

Exam trap

The trap here is that candidates often confuse the cable modem's method of obtaining an IP address with the router's NAT function, leading them to incorrectly select NAT as the answer when DHCP is the correct mechanism used by the modem to request a public IP from the ISP.

How to eliminate wrong answers

Option A is wrong because NAT (Network Address Translation) is a technique used by routers to map private IP addresses to a public IP address, not a method for a cable modem to obtain a public IP address from the ISP. Option C is wrong because static assignment requires manual configuration of the IP address on the modem, which is not the typical method used by ISPs for cable modems; static IPs are usually an additional service. Option D is wrong because APIPA (Automatic Private IP Addressing) assigns a link-local address in the 169.254.0.0/16 range when a DHCP server is unavailable, and it is not used to obtain a public IP address from an ISP.

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74

MCQmedium

A user wants to upgrade their workstation's storage without losing existing data. Which of the following is the BEST method?

A.Clone the existing drive to the new one

B.Perform a clean installation on the new drive

C.Back up data to external drive, then restore

D.Set up a RAID 1 array

AnswerA

Cloning preserves all data.

Why this answer

Option B is correct because cloning copies the entire drive to a new one, preserving data and OS. Option A is incorrect because a clean install erases data. Option C is incorrect because RAID requires multiple drives.

Option D is incorrect because external backup is for backup, not upgrading internal storage.

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75

MCQhard

Refer to the exhibit. A system administrator notices that the computer occasionally freezes and data read errors occur. What should the administrator do?

A.Update the storage controller driver

B.Replace Disk 1

C.Run CHKDSK on both disks

D.Replace Disk 0

AnswerD

Disk 0 is predicted to fail and has reallocated sectors, so replacement is necessary.

Why this answer

Disk 0 is the system disk (as indicated by the 'System' label in the exhibit), and the described symptoms—occasional freezing and data read errors—are classic indicators of a failing hard drive. Replacing Disk 0 addresses the root cause because a failing system disk can cause intermittent read failures and system hangs. Running CHKDSK or updating drivers would only mask the problem temporarily, and replacing Disk 1 (a non-system disk) would not resolve system-level freezes.

Exam trap

The trap here is that candidates assume CHKDSK (Option C) can fix any disk issue, but it only addresses logical corruption, not physical failures, and they may overlook that the 'System' label on Disk 0 indicates it is the boot drive, making its failure the primary cause of system freezes.

How to eliminate wrong answers

Option A is wrong because updating the storage controller driver would not fix physical read errors or freezes caused by a failing disk; driver updates address software compatibility issues, not hardware degradation. Option B is wrong because Disk 1 is labeled as a data disk, and replacing it would not resolve system freezes or read errors originating from the system disk (Disk 0). Option C is wrong because CHKDSK can only detect and repair logical file system errors, not physical media failures; running it on both disks would not fix the underlying hardware problem on Disk 0.

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