220-1101 Networking Practice Test 10 — 15 Questions

Question 1

A workstation with a static IP address of 192.168.1.10/24 can ping its default gateway (192.168.1.1) and other workstations on the same subnet. However, it cannot ping any device on a different subnet (e.g., 10.0.0.1) nor access the internet. Other workstations on the same subnet can ping the same remote device and access the internet without issue. The technician has verified the workstation's IP configuration is correct. Which of the following is the MOST likely cause?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The router's ACL or firewall is blocking the workstation's IP address from accessing other networks.. Since the workstation can ping its default gateway and other local hosts but cannot reach remote subnets or the internet, the issue is not with the local IP configuration or the gateway's reachability. The fact that other workstations on the same subnet can access remote networks points to a policy or filtering mechanism on the router that specifically blocks traffic from this workstation's IP address. This is most commonly implemented via a router ACL or firewall rule that denies traffic from 192.168.1.10 to other networks.

Answer

The workstation's firewall is blocking all traffic to remote subnets.

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The default gateway IP address is misconfigured on the workstation.

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The subnet mask is incorrect.

Question 2

A user reports that their workstation intermittently loses network connectivity. The technician checks the IP configuration during an outage and finds the IP address is 169.254.12.34. The network uses DHCP, and other workstations on the same subnet are functioning normally. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The network cable is either faulty or not fully seated.. The 169.254.x.x address is an Automatic Private IP Addressing (APIPA) address, assigned by the OS when DHCP fails. Since other workstations on the same subnet are working, the DHCP server and switch port are functional, isolating the issue to the local link. A faulty or loose cable can cause intermittent connectivity, leading to DHCP discovery failures and APIPA assignment.

Answer

The DHCP server has run out of IP addresses.

Answer

The network switch port is administratively shut down.

Answer

The workstation's network adapter driver is corrupted.

Question 3

A network technician is connecting two network switches in a small office to extend the wired network. The technician uses two cables between the switches for redundancy, but the network becomes unstable and devices experience intermittent connectivity. Which of the following protocols should the technician implement to prevent network loops while allowing the redundant links?

Accepted Answer

Spanning Tree Protocol (STP). Spanning Tree Protocol (STP) prevents network loops by placing redundant links into a blocking state while maintaining a single active path between switches. When a primary link fails, STP automatically recalculates the topology and transitions a backup link to forwarding, ensuring redundancy without broadcast storms or MAC table instability.

Answer

VLAN (Virtual LAN)

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DHCP (Dynamic Host Configuration Protocol)

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NAT (Network Address Translation)

Question 4

A technician is troubleshooting a user's workstation that has intermittent network connectivity. The technician observes that the Ethernet link light on the workstation's NIC flashes irregularly and occasionally stays off for a few seconds. The cable passes a wiremap test. The switch port is configured for auto-negotiation. Which of the following is the MOST likely cause?

Accepted Answer

Electromagnetic interference from nearby power cables.. The intermittent flashing and occasional off periods of the Ethernet link light, combined with a passing wiremap test, strongly indicate that the signal is being corrupted by external interference. Electromagnetic interference (EMI) from nearby power cables can disrupt the differential signaling on twisted-pair copper cabling, causing link drops and flapping link lights even when the physical wiring is intact. This matches the symptom of a link light that flashes irregularly and stays off for seconds, as the NIC and switch repeatedly lose and re-establish the link due to noise.

Answer

The cable is too long (exceeds 100 meters).

Answer

The workstation's IP address is a duplicate.

Answer

The NIC driver is out of date.

Question 5

A user connects a laptop to a hotel's wired Ethernet port. The laptop obtains an IP address of 169.254.15.32 and cannot access the internet. Other guests' laptops on the same hotel network work without issue. The technician has verified that the laptop's network adapter is enabled, the driver is up to date, and that the Ethernet cable is securely connected. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The switch port is configured with MAC address filtering. The IP address 169.254.15.32 is an Automatic Private IP Addressing (APIPA) address, assigned when a DHCP server is not reached. Since other guests' laptops work fine, the hotel's DHCP server is operational, ruling out a server-side issue. MAC address filtering on the switch port would block the laptop's DHCP request, causing it to fail to obtain a valid IP and fall back to APIPA, while other devices with allowed MAC addresses work normally.

Answer

The hotel's DHCP server is down

Answer

The DNS server address is unreachable

Answer

The Ethernet cable is faulty

Question 6

A user reports that their laptop can see the corporate Wi-Fi network (SSID: CorpNet) and has a strong signal, but cannot connect. Other users on the same network are connecting successfully. The technician checks the laptop's wireless configuration and finds that it is set to obtain an IP address automatically. However, the security settings are set to 'Open'. Which of the following is the MOST likely reason the laptop cannot connect?

Accepted Answer

The laptop is using the wrong encryption type.. The laptop's security settings are set to 'Open', but CorpNet is a corporate Wi-Fi network that almost certainly uses WPA2 or WPA3 encryption. Since the laptop sees the network with a strong signal but fails to connect, the mismatch between the 'Open' (no encryption) setting and the required encryption type prevents successful authentication and association, even though the IP configuration is set to DHCP.

Answer

The laptop's MAC address is not allowed (MAC filtering).

Answer

The laptop is trying to connect to the 5 GHz band but the network is only 2.4 GHz.

Answer

The laptop's wireless adapter is faulty.

Question 7

A network technician is setting up a small office with 15 workstations. The ISP provides a single public IPv4 address. The technician configures the router to assign private IP addresses (192.168.1.x) to the workstations via DHCP. Which technology allows all 15 workstations to share the single public IP address to access the internet?

Accepted Answer

NAT (Network Address Translation). NAT (Network Address Translation) allows multiple devices on a private network (like 192.168.1.x) to share a single public IPv4 address by translating the private source IP and port to the public IP and a unique port number when traffic exits the router. This enables all 15 workstations to access the internet simultaneously using the one public address provided by the ISP.

Answer

DNS (Domain Name System)

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DHCP (Dynamic Host Configuration Protocol)

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ARP (Address Resolution Protocol)

Question 8

A user in a densely populated apartment building complains of frequent Wi-Fi disconnects and slow speeds on the 2.4 GHz band. A spectrum analysis shows many overlapping networks on channels 1, 6, and 11. The router supports both 2.4 GHz and 5 GHz. Which of the following is the BEST solution to improve the user's wireless experience?

Accepted Answer

A. Change the client device to use the 5 GHz band. The 2.4 GHz band is congested with overlapping networks on channels 1, 6, and 11, causing co-channel interference and contention. Moving the client device to the 5 GHz band provides access to many more non-overlapping channels (e.g., 36, 40, 44, 48) and typically less interference, resulting in fewer disconnects and higher throughput.

Answer

B. Change the wireless security from WPA2 to WPA3

Answer

C. Increase the router's transmit power to maximum

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D. Change the network SSID to a unique name

Question 9

A small office network consists of a router and an unmanaged switch. Every day at 2:00 PM, users report extremely slow network performance and intermittent connectivity that lasts about 30 minutes. A technician checks the switch's interface statistics and notices a high number of CRC errors on the port connected to a VoIP phone. The cable connecting the phone to the wall jack is a known working Cat5e cable. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The VoIP phone is configured for half-duplex while the switch port is using full-duplex.. A is correct because a duplex mismatch between the VoIP phone (half-duplex) and the switch port (full-duplex) causes CRC errors, collisions, and performance degradation. The daily 2:00 PM timing suggests a scheduled task like a phone firmware update or DHCP renewal that triggers heavy traffic, exacerbating the mismatch. CRC errors specifically indicate layer 1/2 frame corruption, which is a classic symptom of duplex mismatch.

Answer

The switch is experiencing a broadcast storm caused by a loop in the network.

Answer

The VoIP phone is running QoS that priority-tags all traffic.

Answer

The Category 5e cable is not capable of handling VoIP traffic.

Question 10

A small office has 18 computers that need to be connected to share files and access the internet. The ISP provides a modem with a single Ethernet port. The office router has four LAN ports. Which device should the technician add to enable all 18 computers to connect to the network?

Accepted Answer

B. A switch. A switch is the correct device because it provides multiple Ethernet ports (typically 24 or 48) and operates at Layer 2, forwarding frames based on MAC addresses. This allows all 18 computers to connect to the network, share files, and access the internet through the existing router, which only has four LAN ports.

Answer

A. A hub

Answer

C. A bridge

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D. A firewall

Question 11

A small office network consists of a router (with built-in DHCP server) and an unmanaged switch. All 12 workstations are connected to the switch, and they have internet access. However, users cannot see each other's shared folders over the network. The technician has verified that all workstations are on the same IP subnet (192.168.1.0/24) and can ping each other successfully. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The workstations are configured with different workgroup names. File and printer sharing over a Windows network requires all workstations to belong to the same workgroup (or domain) for NetBIOS-based discovery. Since the workstations can ping each other and are on the same subnet, Layer 3 connectivity is fine, but the inability to see shared folders indicates a Layer 2/application-layer name resolution issue, typically caused by mismatched workgroup names.

Answer

The unmanaged switch is experiencing broadcast storms due to a loop

Answer

The router's DHCP lease time is set too short

Answer

The network cables are not properly crimped to T568B standards

Question 12

A user reports that their laptop can connect to the office Wi-Fi but cannot access any websites. The technician successfully pings the default gateway (192.168.1.1) from the laptop. The technician also logs into the router and successfully pings 8.8.8.8. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The laptop's DNS settings are pointing to an invalid DNS server.. The laptop can ping the default gateway (192.168.1.1) and the router can ping 8.8.8.8, proving Layer 3 connectivity to the internet is working. However, the laptop cannot access websites, which typically indicates a DNS resolution failure. If the laptop's DNS settings point to an invalid or unreachable DNS server, it cannot resolve domain names to IP addresses, even though IP-based connectivity (like pinging 8.8.8.8) is fine.

Answer

The laptop is configured with a static IP address outside the DHCP scope.

Answer

The router's WAN port is disconnected.

Answer

The ISP has a service outage affecting only web traffic.

Question 13

A small office has a router serving as the DHCP and DNS server. All workstations can access the internet but cannot connect to a local file server using its hostname (\fileserver). They can successfully ping the file server's IP address (192.168.1.10). The technician has verified that the file server is powered on and sharing folders. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The router's DNS server does not have a record for the file server's hostname.. The router is serving as the DNS server for the network. Since workstations can ping the file server by IP but not by hostname, the issue is that the DNS server lacks an A (or AAAA) record mapping the hostname 'fileserver' to its IP address 192.168.1.10. Without this record, name resolution fails, even though the server is reachable via IP.

Answer

The DHCP lease on the file server has expired.

Answer

The Windows Firewall on the file server is blocking incoming connections.

Answer

The workstations and file server are in different workgroups.

Question 14

A small office has 15 desktop computers connected to a single managed switch. The switch is connected to a router that provides DHCP and DNS services. Users report that they can access the internet but cannot communicate with each other using computer names (e.g., \PC1). The technician verifies that all workstations are on the same subnet (192.168.1.0/24) and can successfully ping each other's IP addresses. Which of the following is the MOST likely cause of the issue?

Accepted Answer

NetBIOS over TCP/IP is disabled on the workstations. NetBIOS over TCP/IP (NBT) is required for name resolution of NetBIOS names, which are used in Windows for computer names like \PC1. When NBT is disabled, Windows cannot resolve NetBIOS names to IP addresses, preventing communication by computer name even though IP-based communication (ping) works. Since DNS is functioning (internet access works) and all computers are on the same subnet, the most likely cause is that NetBIOS over TCP/IP is disabled on the workstations.

Answer

The DNS server is not configured correctly

Answer

Windows Firewall is blocking file and printer sharing

Answer

Workgroups are not configured the same on all computers

Question 15

A user at a small office reports that they can access the internet but cannot connect to the company's internal file server using its hostname (\fileserver). The user can ping the file server's IP address successfully. The technician checks the workstation's network settings and sees that it is obtaining an IP address from DHCP and the default gateway is correct. The DNS server address is set to the company's internal DNS server (192.168.1.5). Other workstations on the same network can access the file server by hostname without issue. Which of the following is the MOST likely cause of the problem?

Accepted Answer

The workstation's hosts file contains an incorrect entry for fileserver.. The user can ping the file server by IP but not by hostname, and other workstations resolve the hostname correctly. This points to a local name resolution issue on the affected workstation. The hosts file (located at %SystemRoot%\System32\drivers\etc\hosts) is checked before DNS queries, so an incorrect entry mapping 'fileserver' to a wrong or unreachable IP would cause the failure while DNS remains functional for others.

Answer

The file server's firewall is blocking ping requests.

Answer

The workstation's DNS cache is corrupted.

Answer

The file server's network cable is faulty.