220-1101 Networking Practice Test 7 — 15 Questions

Question 1

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?

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

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 2

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 3

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 4

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 5

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 6

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?

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

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.. 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 7

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 8

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

Question 9

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 10

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 11

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 12

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 13

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 14

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 15

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.