220-1101 Networking Practice Test 5 — 15 Questions

Question 1

A small office network consists of 12 workstations and a single router. The administrator wants each workstation to obtain an IP address, subnet mask, and default gateway automatically without manual configuration. Which protocol must be enabled on the router to provide this functionality?

Accepted Answer

DHCP (Dynamic Host Configuration Protocol). DHCP (Dynamic Host Configuration Protocol) is the correct answer because it automatically assigns IP addresses, subnet masks, default gateways, and other network parameters to clients from a defined pool. Without DHCP, each workstation would require static manual configuration, which violates the requirement for automatic assignment.

Answer

DNS (Domain Name System)

Answer

HTTP (Hypertext Transfer Protocol)

Answer

FTP (File Transfer Protocol)

Question 2

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?

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 3

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 4

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 5

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 6

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 7

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 8

A technician is installing a new wireless router in a small office. The router is connected to a cable modem that has a solid online light. All wireless clients can connect to the router’s Wi-Fi network, but they cannot access the internet. Which of the following should the technician check NEXT?

Accepted Answer

Verify the router’s WAN port settings and ensure it is set to obtain an IP address automatically. The cable modem has a solid online light, indicating it is functioning correctly and has internet connectivity. Since wireless clients can connect to the router but cannot access the internet, the issue is likely that the router's WAN interface is not receiving a public IP address from the modem. The technician should verify the router's WAN port settings and ensure it is set to obtain an IP address automatically via DHCP, as cable modems typically assign IP addresses using DHCP. This is the most logical next step because the router must have a valid WAN IP to route traffic to the internet.

Answer

Replace the Ethernet cable between the router and modem

Answer

Disable the router’s DHCP server and assign static IPs to clients

Answer

Adjust the DNS server settings on the wireless clients

Question 9

A small business currently has a single router that provides internet access and DHCP services. The owner wants to add a second wireless router to extend Wi-Fi coverage to a far part of the building. The technician connects the WAN port of the new router to a LAN port on the existing router using a patch cable. Wireless clients can connect to the new router's SSID and obtain IP addresses, but they cannot access the internet or any resources on the main LAN. Which of the following is the most likely cause?

Accepted Answer

The new router is performing NAT, causing double NAT. When the WAN port of the new router is connected to a LAN port of the existing router, the new router treats the existing network as its 'internet' side and performs Network Address Translation (NAT) on all traffic from its wireless clients. This creates a double NAT scenario: the new router translates private IPs to its own WAN IP (typically 192.168.1.x), and then the existing router translates that again to its public IP. The result is that return traffic cannot be properly routed back to the wireless clients, breaking internet and LAN access.

Answer

The new router's wireless security is set to WPA3

Answer

The existing router's DHCP pool is exhausted

Answer

The patch cable is a crossover cable

Question 10

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.. Option B is correct because 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 11

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 12

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 13

A small office network uses a router (192.168.1.1/24) and an unmanaged switch. A technician configures a server with a static IP address 192.168.1.100/24, gateway 192.168.1.1, and connects it to the switch. 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. The server can ping the router and its own IP, indicating its network stack and default gateway are correctly configured. Workstations can ping the router but not the server, which points to a host-level issue on the server. The most likely cause is the server's firewall blocking ICMP echo requests (ping), as this is a common default security setting on server operating systems.

Answer

The server has a duplicate IP address

Answer

The switch port is administratively disabled

Answer

The default gateway is incorrect

Question 14

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 15

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.