220-1101 Networking Practice Test 7 — 15 Questions

Question 1

A technician is installing a PoE security camera that is located 85 meters (279 feet) from the network switch. The switch does not support Power over Ethernet (PoE). The camera requires both data connectivity and power over the same Ethernet cable. Which of the following is the best solution?

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

Accepted Answer

Use a PoE injector at the switch location. A PoE injector at the switch location is the best solution because it adds power to the Ethernet cable without requiring a PoE switch. The camera is 85 meters away, which is within the 100-meter maximum for Ethernet (Cat 5e/6), so the existing cabling can carry both data and power when a PoE injector is used. This provides a cost-effective, single-cable solution for both connectivity and power.

Answer

Use a PoE power supply connected directly to the camera

Answer

Replace the existing cable with Cat 6a cabling

Answer

Use fiber optic cable with media converters at each end

Question 2

A small office has 15 workstations connected to a single unmanaged switch, which is connected to a router that provides internet access. Users report that the network is slow. A technician notices that the activity lights on the switch are blinking rapidly and almost constantly, even during off-peak hours. Which of the following is the most likely cause?

Accepted Answer

Excessive broadcast traffic. The rapid and constant blinking of activity lights on an unmanaged switch indicates a high volume of frames being forwarded, which is characteristic of a broadcast storm. In a small network, excessive broadcast traffic (e.g., from ARP requests or NetBIOS name resolutions) can saturate the switch's backplane and all ports, consuming bandwidth and causing slowdowns even during off-peak hours. This occurs because switches forward broadcast frames to all ports except the ingress port, and without broadcast storm control (unmanaged switch), the traffic can overwhelm the network.

Answer

Duplicate IP addresses

Answer

Faulty default gateway

Answer

DNS server failure

Question 3

A user in a small office can access shared files on the local network and can connect to the internet using a web browser when entering IP addresses directly (e.g., http://198.51.100.1) but cannot access any websites by their domain names (e.g., www.example.com). The network uses a DHCP server. Which of the following is the most likely cause of this issue?

Accepted Answer

The DNS server address is incorrect or unreachable.. The user can access resources by IP address but not by domain name, which indicates that name resolution is failing. Since the network uses DHCP, the most likely cause is that the DHCP server is providing an incorrect or unreachable DNS server address, preventing the client from resolving domain names to IP addresses.

Answer

The default gateway is configured incorrectly.

Answer

The subnet mask is set to a value that prevents Internet access.

Answer

The DHCP server has exhausted its address pool.

Question 4

A small business has a single router with four built-in LAN ports. They need to connect 12 workstations to the network. The technician adds a 24-port unmanaged switch and connects it to one of the router's LAN ports. After connecting all workstations, some users report intermittent network connectivity. The technician checks the switch and notices the collision LED is flashing rapidly. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The network is experiencing excessive collisions due to a duplex mismatch. The rapid flashing of the collision LED on the switch indicates that the network is experiencing an abnormally high number of collisions. In a modern switched network, collisions should be virtually nonexistent because each switch port creates its own collision domain. The most common cause of excessive collisions in this scenario is a duplex mismatch, where one device (likely the router's LAN port) is operating at half-duplex while the switch port is set to auto-negotiate or is forced to full-duplex. Half-duplex requires collision detection (CSMA/CD), and when a full-duplex device transmits simultaneously, the half-duplex device interprets the resulting frame corruption as a collision, leading to repeated retransmissions and the observed LED behavior.

Answer

The switch is malfunctioning and needs to be replaced

Answer

The router's LAN port is not configured for the correct speed

Answer

The switch is not receiving enough power from the router

Question 5

A user in a small office reports that their laptop cannot connect to the corporate Wi-Fi network. Other devices in the same area connect without issue. The laptop can connect to the internet when plugged into the wired Ethernet port. The technician checks the wireless adapter status and sees it is enabled and shows available networks, but the corporate SSID is not listed. Which of the following is the most likely cause?

Accepted Answer

The wireless network is configured for 5 GHz only, and the laptop only supports 2.4 GHz.. The corporate SSID is not listed on the laptop, but other devices connect fine, indicating the network exists and is reachable. If the network is configured for 5 GHz only and the laptop only supports 2.4 GHz, the laptop will not see the SSID because it cannot tune to the 5 GHz frequency band during passive or active scanning. This matches the symptom of a missing SSID while the adapter is otherwise functional.

Answer

The laptop's MAC address is not allowed on the wireless network.

Answer

The wireless router is not broadcasting the SSID.

Answer

The laptop's Wi-Fi antenna is disconnected inside the case.

Question 6

A user's workstation is unable to access the internet. The technician runs ipconfig and sees an IP address of 169.254.1.15 with a subnet mask of 255.255.0.0. What is the most likely cause?

Accepted Answer

The DHCP server is not responding.. The IP address 169.254.1.15 with a subnet mask of 255.255.0.0 is an Automatic Private IP Addressing (APIPA) address, which Windows assigns when a DHCP client fails to receive an IP lease from a DHCP server. This indicates that the DHCP server is not responding to the client's DHCP Discover messages, causing the client to self-assign an APIPA address and lose internet connectivity.

Answer

The default gateway is unreachable.

Answer

The DNS server is misconfigured.

Answer

The IP address is statically assigned.

Question 7

A small office has 10 workstations connected to a single unmanaged switch, which is connected to a router that provides internet access. All workstations can access the internet. The manager wants to add a network printer so all workstations can print. The printer has an Ethernet port. Which of the following is the easiest way to connect the printer to the network?

Accepted Answer

Connect the printer to an available port on the switch.. Connecting the printer to an available port on the unmanaged switch places it on the same Layer 2 broadcast domain as the 10 workstations. Since the switch is already connected to the router for internet access, the printer will receive an IP address via DHCP from the router (or via link-local addressing if no DHCP server is present), making it immediately discoverable by all workstations on the network without requiring any additional configuration or dedicated host.

Answer

Connect the printer directly to a workstation's USB port and share it.

Answer

Connect the printer to the router's USB port.

Answer

Connect the printer to the WAN port of the router.

Question 8

A technician is setting up a small network for a home office. The ISP modem provides a public IP address via DHCP. The technician connects a wireless router's WAN port to the modem and configures the router to use DHCP on the WAN interface. The router's LAN network is 192.168.1.0/24. A user connects a laptop via Ethernet to one of the router's LAN ports and can access the internet. However, the user's network printer, which has a static IP address, was previously connected directly to the modem and now cannot be reached from the laptop. The printer is powered on and its Ethernet link light is on. Which of the following is the most likely cause?

Accepted Answer

B. The printer's static IP address is on a different subnet from the router's LAN. The printer's static IP address is likely on a different subnet from the router's LAN (192.168.1.0/24). Since the printer was previously connected directly to the modem, it probably had a public or different private IP address (e.g., 192.168.0.x or 10.0.0.x). The laptop cannot reach the printer because the router will not forward traffic destined for an IP outside its LAN subnet without a route, and the printer's static IP is not in the same broadcast domain.

Answer

A. The printer's firewall is blocking ICMP

Answer

C. The printer needs to be connected to the WAN port of the router

Answer

D. The router's DHCP server is conflicting with the printer's static IP

Question 9

A small office uses a single DHCP server to assign IP addresses. Recently, several users have reported that their laptops cannot connect to the wired network. The technician runs ipconfig on one of the affected laptops and sees an IP address of 169.254.13.45 with a subnet mask of 255.255.0.0. The DHCP server shows that the scope has only 5 available addresses out of 100. Which of the following is the most likely cause of the problem?

Accepted Answer

The DHCP scope is exhausted due to the limited number of available addresses.. The IP address 169.254.13.45 with a subnet mask of 255.255.0.0 is an Automatic Private IP Addressing (APIPA) address, assigned by Windows when a DHCP server cannot be reached or does not have available addresses. Since the DHCP scope has only 5 available addresses out of 100, the scope is effectively exhausted, meaning new clients cannot obtain a lease and fall back to APIPA. This directly matches the symptom of multiple laptops failing to connect.

Answer

The DHCP server is overloaded and responding slowly.

Answer

The affected laptops have a static IP address configured.

Answer

The network switch is not forwarding DHCP broadcast requests.

Question 10

A small office network uses a router with DHCP enabled on the 192.168.1.0/24 subnet. A technician configures a file server with a static IP address of 192.168.1.150, subnet mask 255.255.255.0, and default gateway 192.168.1.1. Workstations on the same subnet can ping the router (192.168.1.1) but cannot ping the server. The server can ping its own IP and the router. Which of the following is the MOST likely cause?

Accepted Answer

The server's firewall is blocking ICMP echo requests. The server can ping its own IP and the router, indicating its IP configuration (address, subnet mask, default gateway) is correct and it has network connectivity. Workstations can ping the router but not the server, which rules out a routing or subnet issue. The most likely cause is that the server's firewall is blocking ICMP echo requests (pings), a common security configuration that prevents the server from responding to ping probes while allowing other traffic.

Answer

The server has been assigned a duplicate IP address

Answer

The subnet mask on the server is incorrect

Answer

The DHCP server has already assigned the address 192.168.1.150 to another device

Question 11

A technician is setting up a small office network. The router is connected to the ISP modem and has a public IP address on its WAN interface. The router's LAN is configured with DHCP on the 192.168.1.0/24 subnet. A workstation obtains an IP address of 192.168.1.10, subnet mask 255.255.255.0, and default gateway 192.168.1.1 from the router. The workstation can ping the gateway and other workstations on the same subnet, but it cannot access websites by IP address or domain name. Which of the following is the most likely cause?

Accepted Answer

Network Address Translation (NAT) is not enabled on the router.. The workstation can ping the gateway and local devices, indicating Layer 2/3 connectivity within the LAN is functional. However, it cannot reach external websites by IP or domain name, which points to a failure in translating private IP addresses to the public IP on the WAN interface. Network Address Translation (NAT) is required on the router to map the private 192.168.1.0/24 subnet to the public IP; without it, packets from the workstation have no routable source address on the internet, so responses cannot return.

Answer

The workstation's DNS server is not configured correctly.

Answer

The workstation's subnet mask is incorrect.

Answer

The default gateway is incorrect.

Question 12

A small office uses a single router with DHCP enabled (192.168.1.0/24). A technician configures a network printer with a static IP address of 192.168.1.150, subnet mask 255.255.255.0, default gateway 192.168.1.1, and DNS server 8.8.8.8. The printer is connected to the same switch as the workstations. Workstations can ping the router but cannot ping the printer. The printer can ping its own IP and the router. Which of the following is the MOST likely cause?

Accepted Answer

The printer's static IP address is within the DHCP scope.. The printer's static IP address 192.168.1.150 falls within the router's DHCP scope (typically 192.168.1.100–192.168.1.199 for a /24 network). When a DHCP server assigns an address to a workstation, it may hand out 192.168.1.150, creating an IP address conflict. This conflict causes intermittent or complete loss of connectivity to the printer because the router and switch see two devices claiming the same IP, and ARP tables become unstable. Workstations can ping the router because their own IPs are valid, but they cannot reach the printer due to the duplicate address.

Answer

The printer's firewall is blocking ICMP.

Answer

The printer's subnet mask is incorrect.

Answer

The printer's default gateway is incorrect.

Question 13

A technician is configuring a small office network with a managed switch. The network has two VLANs: VLAN 10 for workstations (192.168.10.0/24) and VLAN 20 for servers (192.168.20.0/24). The switch ports for workstations are set to access mode and assigned to VLAN 10. The server ports are also set to access mode and assigned to VLAN 20. The router is connected to one of the switch ports and is configured with subinterfaces (192.168.10.1 on VLAN 10 and 192.168.20.1 on VLAN 20) to route between VLANs. A workstation on VLAN 10 cannot ping a server on VLAN 20. The workstation can ping other workstations on VLAN 10. The technician has verified the router subinterfaces are configured correctly. Which of the following is the MOST likely cause of the problem?

Accepted Answer

B. The workstation can ping other workstations on VLAN 10, confirming Layer 2 connectivity within the VLAN. The router subinterfaces are correctly configured, so the issue is likely that the switch port connecting to the router is not configured as a trunk port. Without a trunk, the switch cannot carry both VLAN 10 and VLAN 20 traffic to the router, preventing inter-VLAN routing.

Answer

A

Answer

C

Answer

D

Question 14

A user reports that their workstation cannot access network resources. The technician runs ipconfig and sees the following: IP address: 192.168.1.100, Subnet mask: 255.255.255.0, Default gateway: 192.168.1.1. The technician pings 127.0.0.1 (success), pings 192.168.1.100 (success), but pinging 192.168.1.1 fails. Other workstations on the same subnet can ping the default gateway successfully. The cable is connected and the link light is on. Which of the following is the MOST likely cause?

Accepted Answer

Duplicate IP address.. The workstation has a valid IP address and subnet mask, and the loopback (127.0.0.1) and its own IP (192.168.1.100) respond to ping, confirming the TCP/IP stack and network interface are working. The failure to ping the default gateway (192.168.1.1) while other workstations on the same subnet can reach it indicates a local issue. A duplicate IP address on the network would cause the workstation to receive no reply from the gateway because the gateway's ARP table may map the IP to another device's MAC address, or the duplicate device may respond with a conflicting ARP reply, preventing proper communication.

Answer

DNS server is not configured.

Answer

Incorrect subnet mask.

Answer

Firewall on the workstation blocking ICMP.

Question 15

A technician is setting up a small office network. The router is configured with DHCP and provides addresses in the 192.168.1.0/24 range. A workstation obtains an IP address of 192.168.1.15 but cannot access any external websites. The workstation can ping the default gateway (192.168.1.1) and other local workstations. Which of the following is the most likely cause?

Accepted Answer

The DNS server address is not configured. The workstation can ping the default gateway and local devices, confirming that Layer 3 connectivity and the default gateway are functional. However, it cannot access external websites, which typically requires DNS resolution to translate domain names to IP addresses. Since the router's DHCP is configured but the workstation lacks a DNS server address, name resolution fails, preventing web access while IP-level communication remains intact.

Answer

The workstation's subnet mask is incorrect

Answer

The default gateway is not set

Answer

The router's DHCP pool is exhausted