220-1101 Networking Practice Test 4 — 15 Questions

Question 1

A small office uses a single router that provides DHCP services for the LAN. The router is connected to a switch, and all workstations are connected to the switch. Two workstations (Workstation A and Workstation B) are unable to obtain an IP address from DHCP. They both receive APIPA addresses. Other workstations on the same switch obtain IP addresses and can access the internet. The technician checks the router's DHCP server logs and sees that the pool is not exhausted. Which of the following is the MOST likely cause of the issue?

Accepted Answer

Port security on the switch is limiting the number of MAC addresses per port. Port security on the switch can be configured to limit the number of MAC addresses allowed on a specific port. If the ports used by Workstation A and Workstation B have reached their MAC address limit, the switch will drop DHCP Discover broadcasts from those workstations, preventing them from obtaining an IP address. Since other workstations on different ports are working, and the DHCP pool is not exhausted, port security is the most likely cause.

Answer

The default gateway address is incorrect on the router

Answer

The switch ports used by the affected workstations are assigned to a different VLAN than the router

Answer

The DHCP relay agent on the switch is misconfigured

Question 2

A technician is setting up a small office network. The company has a single public IP address from the ISP. The technician needs to configure the router so that multiple internal devices can share that IP address to access the internet. Which of the following settings should the technician configure?

Accepted Answer

NAT (Network Address Translation). Network Address Translation (NAT) allows multiple devices on a private network to share a single public IP address by mapping their private IP addresses and port numbers to the public IP and unique port numbers. This is the standard method for conserving public IPv4 addresses and enabling internet access for internal hosts.

Answer

Port forwarding

Answer

DMZ (Demilitarized Zone)

Answer

DHCP (Dynamic Host Configuration Protocol)

Question 3

A technician is setting up a small office network. The ISP provides a modem with a single Ethernet port. The office has 10 computers that all need to share the single public IP address to access the internet. Which of the following devices should the technician connect directly to the modem to allow all computers to access the internet?

Accepted Answer

B. The correct answer is B because a router is required to perform Network Address Translation (NAT), which allows multiple devices on a local network to share a single public IP address provided by the ISP's modem. The router connects directly to the modem's Ethernet port and then distributes private IP addresses (e.g., 192.168.x.x) to the 10 computers, translating their outbound traffic to the single public IP. A switch or hub alone cannot perform NAT and would not enable internet sharing without a router.

Answer

A

Answer

C

Answer

D

Question 4

A user reports that they can access internal company servers using IP addresses (e.g., 192.168.1.100) but cannot browse the internet. The user can ping the default gateway (192.168.1.1) successfully. Other users on the same subnet have full internet access. The technician checks the user's IP configuration and sees that the IP address, subnet mask, default gateway, and DNS server (192.168.1.10) are all correct. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The user's browser proxy settings are configured to use an incorrect proxy server. Since the user can access internal servers by IP and successfully ping the default gateway, Layer 3 connectivity is intact. The inability to browse the internet while other users on the same subnet have full access points to a client-specific configuration issue. A misconfigured browser proxy setting (e.g., pointing to an incorrect or non-existent proxy server) would prevent HTTP/HTTPS traffic from reaching external destinations, even though DNS and IP routing are working correctly.

Answer

The DNS server is not resolving external domain names

Answer

The network cable is loose or faulty

Answer

The user's IP address is in the wrong subnet

Question 5

A small office uses a single router that provides DHCP services for the LAN. The router is connected to a managed switch, and 20 workstations are connected to the switch. Two workstations (Workstation A and Workstation B) are unable to obtain an IP address from DHCP. They both receive APIPA addresses (169.254.x.x). Other workstations on the same switch obtain IP addresses and can access the internet. The technician checks the router's DHCP server logs and sees that the pool of available addresses is not exhausted. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The switch ports for Workstation A and B are configured on a different VLAN that does not have DHCP access. The correct answer is A because if Workstation A and B are on a different VLAN that lacks a DHCP relay agent or a DHCP server configured for that VLAN, their DHCP discovery broadcasts will not reach the DHCP server. The router's DHCP logs show available addresses, ruling out exhaustion, and other workstations on the same physical switch obtain IPs, indicating the switch is not the issue. APIPA addresses (169.254.x.x) are assigned when no DHCP response is received, which aligns with VLAN isolation blocking DHCP traffic.

Answer

The workstations have static IP addresses configured

Answer

The DHCP server is out of leases

Answer

The network cables for those workstations are faulty

Question 6

A user reports that they can access internal company servers by IP address and hostname, but cannot browse the internet. The user can ping the default gateway (192.168.1.1) successfully. Other users on the same subnet have full internet access. The technician checks the user's IP configuration and sees that the IP address, subnet mask, default gateway, and DNS server (192.168.1.10) are all correct. Which of the following should the technician check NEXT?

Accepted Answer

Check the browser's proxy settings. Since the user can access internal resources by hostname (indicating DNS resolution works for internal names) and can ping the default gateway, the issue is isolated to internet-bound traffic. The most likely cause is that the browser is configured to use a proxy server that is unreachable or misconfigured, which would prevent internet access while leaving local network connectivity intact. Checking the browser's proxy settings is the logical next step because the user's IP configuration is correct and other users on the same subnet have full internet access.

Answer

Check the default gateway

Answer

Check the DHCP lease status

Answer

Check the switch port security settings

Question 7

A technician is troubleshooting a user's computer that can successfully ping internal servers by IP address and hostname, but cannot access any external websites or services on the internet. The user can ping the default gateway (192.168.1.1). Other users on the same subnet have normal internet access. The technician has verified that the IP address, subnet mask, default gateway, and DNS server settings are correct on the user's computer. Which TWO of the following are the MOST likely causes of this issue? (Choose two.)

Accepted Answer

The computer has a static route configured with a low metric that bypasses the default gateway.. Option A is correct because a static route with a low metric can override the default gateway for external traffic. If the computer has a manually configured route that points to a non-existent or unreachable next-hop for the 0.0.0.0/0 destination, all internet-bound packets will be sent there instead of the default gateway, breaking external access while internal pings (which match more specific routes) still work.

Answer

The DNS server is not resolving external domain names.

Answer

The default gateway is incorrect.

Question 8

A technician is setting up a small office network. The ISP provides a modem with a single Ethernet port and a single public IP address. The office has eight computers that all need to access the internet simultaneously. Which of the following devices should the technician connect directly to the modem to allow all computers to share the internet connection?

Accepted Answer

Router. The router is required because it performs Network Address Translation (NAT), which allows multiple devices on the local network to share a single public IP address provided by the ISP. It also routes traffic between the local subnet and the internet, handling both IP address assignment (via DHCP) and packet forwarding. A switch alone cannot translate addresses or route between networks, so it would not enable internet sharing.

Answer

Switch

Answer

Hub

Answer

Modem

Question 9

A user reports that they cannot access the internet, but they can access internal network resources by IP address. The technician runs ipconfig and sees IP address 192.168.1.12, subnet mask 255.255.255.0, default gateway 192.168.1.1, DNS server 192.168.1.1. The user can ping 192.168.1.1 and 8.8.8.8 successfully. However, they cannot ping www.google.com. Which of the following is the MOST likely cause?

Accepted Answer

The DNS server is not resolving hostnames.. The user can ping the default gateway (192.168.1.1) and an external IP (8.8.8.8) successfully, which confirms that the network layer (IP routing) is working and the internet connection is functional. However, the inability to ping www.google.com by name while being able to ping by IP indicates that the DNS server (192.168.1.1) is failing to resolve the hostname to an IP address. Since the DNS server is the same as the default gateway, it is likely that the gateway device is not configured to perform DNS resolution or the DNS service is not running.

Answer

The default gateway is unreachable.

Answer

The subnet mask is incorrect.

Answer

The NIC is faulty.

Question 10

A user reports that after a power outage and router restart, their desktop computer can no longer access network shares on other computers. The user can access the internet. The technician runs ipconfig and sees the IP address changed from 192.168.1.50 to 192.168.1.75. The other computers on the network have static IP addresses. Which of the following should the technician configure to resolve the issue permanently?

Accepted Answer

Configure a DHCP reservation on the router for the user's computer.. The user's IP address changed from 192.168.1.50 to 192.168.1.75 after the router restart, indicating the computer received a new DHCP lease. Since other computers use static IPs, the user's computer likely had a static IP before the outage but reverted to DHCP after the restart, or it was always using DHCP and the router assigned a different address. Configuring a DHCP reservation on the router ensures the router always assigns the same IP (192.168.1.50) to the user's MAC address, permanently resolving the connectivity issue to network shares without changing the computer's configuration.

Answer

Configure a static IP address on the user's computer.

Answer

Set a shorter DHCP lease time on the router.

Answer

Change the subnet mask to 255.255.0.0.

Question 11

A technician is setting up a small office network. The router has only four LAN ports, but the office has six computers and two network printers that all need to be connected to the same network. Which additional device should the technician use to connect all devices?

Accepted Answer

A switch. A switch is the correct choice because it provides multiple Ethernet ports (typically 8, 16, or 24) and operates at Layer 2 of the OSI model, forwarding frames based on MAC addresses. This allows the technician to connect the six computers and two printers (eight devices total) to the router's single LAN port via the switch, creating a single broadcast domain while efficiently managing traffic.

Answer

A hub

Answer

A modem

Answer

A patch panel

Question 12

A small business owner wants to allow remote employees to access a file server on the company's internal network from the internet. The company has a single public IP address provided by the ISP and a router that performs NAT. The file server has a static private IP address of 192.168.1.100. Which of the following router configuration settings should the technician use to enable this access?

Accepted Answer

Port forwarding. Port forwarding allows the router to direct incoming traffic from the internet (on a specific port) to the internal file server at 192.168.1.100. Since the company has only one public IP and uses NAT, port forwarding is the standard method to make an internal server reachable from the internet without exposing the entire LAN.

Answer

VLAN configuration

Answer

DHCP reservation

Answer

MAC address filtering

Question 13

A technician is setting up a small office network. The ISP provides a cable modem with a single Ethernet port. The office has 15 computers that all need internet access. The technician has a router with four LAN ports and a 24-port unmanaged switch. Which of the following is the correct way to connect the devices to provide internet access to all computers?

Accepted Answer

Connect the modem to the router's WAN port, then connect the switch to one of the router's LAN ports, and connect all computers to the switch.. Option B is correct because the router's WAN port is designed to connect to the ISP modem for public IP assignment via DHCP, while the LAN ports provide private IP addresses to internal devices. The switch connects to a LAN port to expand the number of available ports, allowing all 15 computers to access the internet through the router's NAT and routing functions.

Answer

Connect the modem to one of the router's LAN ports, then connect the switch to another LAN port, and connect all computers to the switch.

Answer

Connect the modem directly to the switch, then connect the router to the switch, and connect all computers to the router's LAN ports.

Answer

Connect the modem to one of the switch's ports, then connect the router to another switch port, and connect all computers to the router.

Question 14

A technician configures a new managed switch in a small network. After connecting the switch to the existing switch via a single Ethernet cable, the link LED on the uplink port is solid amber. Devices on the new switch cannot communicate with devices on the existing network. The existing network has no loops and uses a single switch. Which of the following is the MOST likely cause?

Accepted Answer

Spanning Tree Protocol (STP) is blocking the uplink port. The solid amber link LED on the uplink port indicates that the port is administratively up but being blocked by Spanning Tree Protocol (STP). When a new switch is connected to an existing network, STP transitions the port through listening and learning states before forwarding, but if a loop is detected or the port remains in a blocking state, the amber LED confirms STP is preventing traffic. Since the existing network has no loops, STP is likely blocking the port due to a misconfiguration or because it is still in the process of convergence, which prevents communication between devices on the new switch and the existing network.

Answer

The new switch has an IP address conflict

Answer

The new switch is in a different VLAN

Answer

The cable connecting the switches is faulty

Question 15

A user reports that they can access the internet and browse other websites normally, but when they try to visit https://www.example.com, the browser displays 'This site can't be reached'. Other computers on the same network can access the website. The technician has confirmed that the computer can ping the IP address of the website's server (93.184.216.34) successfully. The DNS settings appear correct. Which of the following should the technician check FIRST?

Accepted Answer

C. Verify the computer's hosts file has no entry for www.example.com. The hosts file (located at C:\Windows\System32\drivers\etc\hosts on Windows) is a local override for DNS resolution. Since the computer can ping the server by IP (93.184.216.34) but fails to reach the FQDN (www.example.com) via HTTPS, a misconfigured hosts entry could be redirecting the domain to an incorrect or unreachable IP, bypassing the otherwise correct DNS settings. This is the first check because it directly explains the symptom without affecting other computers.

Answer

A. Check the browser's proxy settings

Answer

B. Run the Windows Network Troubleshooter

Answer

D. Release and renew the DHCP lease