FC0-U61 Infrastructure — Timed 50 Questions

Question 1

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?

Accepted Answer

Incorrect default gateway. 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.

Answer

Windows Firewall blocking outbound traffic

Answer

DNS server not responding

Answer

Faulty Ethernet cable

Question 2

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?

Accepted Answer

Router. 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.

Answer

Modem

Answer

Hub

Answer

Switch

Question 3

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?

Accepted Answer

Reduced cooling efficiency and hot spots. 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.

Answer

Increased electrical load on the UPS

Answer

Increased humidity levels

Answer

Reduced battery backup time

Question 4

A technician is troubleshooting a network slowdown. The technician suspects a loop in the network. Which of the following protocols would prevent such a loop?

Accepted Answer

STP. STP (Spanning Tree Protocol) is the correct answer because it is specifically designed to prevent network loops in Ethernet networks by dynamically blocking redundant paths. When a loop occurs, broadcast frames can circulate endlessly, causing a broadcast storm that degrades network performance. STP ensures a loop-free topology by placing some switch ports into a blocking state while maintaining redundant links for failover.

Answer

DNS

Answer

NAT

Answer

DHCP

Question 5

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

Accepted Answer

WPA2. 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.

Answer

WEP

Answer

MAC address filtering

Answer

Disable SSID broadcast

Question 6

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?

Accepted Answer

Data is still available, but performance may degrade. 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.

Answer

Data is available only after replacing the disk

Answer

The server will shut down

Answer

All data on the array is lost

Question 7

A user reports that they cannot print to a network printer. Other users can print to the same printer. Which of the following should the technician check FIRST?

Accepted Answer

The printer driver on the user's computer. Since other users can print to the same network printer, the printer itself, its network connectivity, and its IP address are all functioning correctly. The issue is isolated to the single user's computer, making the printer driver on that machine the most likely cause. A corrupted, missing, or incorrect driver would prevent that specific user from sending print jobs while others remain unaffected.

Answer

The printer's IP address

Answer

The network switch port

Answer

The printer's power cable

Question 8

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

Accepted Answer

Resolves domain names to IP addresses. 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.

Answer

Hosts web pages

Answer

Forwards traffic between networks

Answer

Assigns IP addresses to devices

Question 9

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?

Accepted Answer

The DHCP server is unavailable. 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.

Answer

The network cable is faulty

Answer

The DNS server is unreachable

Answer

The gateway is misconfigured

Question 10

A company wants to implement a backup solution that allows for quick restoration of individual files. Which backup type should be used?

Accepted Answer

Full backup. A full backup creates a complete copy of all selected data, allowing any individual file to be restored directly from that single backup set without needing to process other backup sets. This makes it the simplest and fastest option for restoring specific files, as no additional dependencies or chain reconstructions are required.

Answer

System image backup

Answer

Differential backup

Answer

Incremental backup

Question 11

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

Accepted Answer

Switch. 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.

Answer

Hub

Answer

Modem

Answer

Router

Question 12

Which TWO of the following are benefits of virtualization in a data center?

Accepted Answer

Improved disaster recovery capabilities. Virtualization enables rapid restoration of virtual machines (VMs) from snapshots or backups, often within minutes, regardless of underlying hardware failures. This decoupling of the OS from physical hardware allows VMs to be migrated or recovered on different hosts, significantly improving recovery time objectives (RTOs) and recovery point objectives (RPOs) compared to physical server recovery.

Answer

Increased hardware reliability

Answer

Enhanced physical security

Answer

Simplified network configuration

Question 13

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

Accepted Answer

Implementing MAC address filtering. 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`.

Answer

Enabling WEP encryption

Answer

Changing the default IP address range

Question 14

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

Accepted Answer

Resources are shared from servers. 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.

Answer

No dedicated server required

Answer

All devices are equal

Answer

Typically used in small offices with few computers

Question 15

Which THREE of the following are types of network topologies?

Accepted Answer

Mesh. A mesh topology connects each device to every other device, providing high redundancy and fault tolerance. It is a valid network topology type commonly used in WANs and wireless networks.

Answer

Triangle

Answer

Circle

Question 16

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?

Accepted Answer

DNS server addresses. 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.

Answer

IPv4 address

Answer

Subnet mask

Answer

DHCP enabled

Question 17

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?

Accepted Answer

GigabitEthernet0/0 is disabled. 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.

Answer

Incorrect subnet mask on the PC

Answer

Missing route to 10.0.0.0/24

Answer

Faulty cable on GigabitEthernet0/1

Question 18

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

Accepted Answer

Download files from example-bucket. 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.

Answer

Upload files to example-bucket

Answer

Delete files from example-bucket

Answer

List the contents of example-bucket

Question 19

A small business has 20 employees using a mix of wired and wireless devices. The network uses a single router with built-in 4-port switch and Wi-Fi. Recently, employees have reported intermittent connectivity drops, especially during peak hours. The technician notices that the router's CPU usage is consistently at 90% or higher. The business cannot afford to replace the router immediately. Which of the following actions would BEST improve the situation without purchasing new hardware?

Accepted Answer

Configure VLANs to separate wired and wireless traffic. Configuring VLANs separates wired and wireless traffic into distinct broadcast domains, reducing the amount of broadcast traffic and collisions that the router's CPU must process. This lowers CPU overhead, which directly addresses the 90% CPU usage causing intermittent drops, without requiring new hardware.

Answer

Disable Quality of Service (QoS) settings

Answer

Disable the Wi-Fi network and require all devices to connect via Ethernet

Answer

Assign static IP addresses to all devices

Question 20

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?

Accepted Answer

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

Answer

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

Answer

The failed UPS was overloaded and only some servers lost power

Answer

The servers that remained on had only one power supply connected