220-1101 Networking Practice Test 10 — 15 Questions

Question 1

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?

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

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.

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DNS (Domain Name System)

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DHCP (Dynamic Host Configuration Protocol)

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ARP (Address Resolution Protocol)

Question 2

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.

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B. Change the wireless security from WPA2 to WPA3

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C. Increase the router's transmit power to maximum

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D. Change the network SSID to a unique name

Question 3

A technician is setting up a small office network with 20 computers. The ISP provides a modem that only has one Ethernet port. The technician needs to connect all computers to the internet and allow them to communicate with each other. Which device should the technician use to connect the computers to the modem?

Accepted Answer

A switch. A switch is the correct device because it operates at Layer 2 of the OSI model, using MAC addresses to forward frames only to the specific port where the destination device is connected. This allows all 20 computers to communicate with each other locally and share the single Ethernet port from the modem for internet access, while providing dedicated bandwidth per port and reducing collisions.

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A hub

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A bridge

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A router

Question 4

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.

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

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

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

Question 5

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.

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A. A hub

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C. A bridge

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D. A firewall

Question 6

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.

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

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The router's WAN port is disconnected.

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The ISP has a service outage affecting only web traffic.

Question 7

A technician is troubleshooting a user's workstation that can ping other computers on the local network but cannot access any websites. The user's router is configured with DHCP and DNS is set to automatic. The technician runs ipconfig /all and sees the workstation has an IP address of 192.168.1.45 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician successfully pings 8.8.8.8 from the workstation. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The workstation has a manually configured DNS server that is unreachable. The workstation can ping 8.8.8.8 (a public IP address) successfully, which confirms that IP routing, the default gateway, and the physical network layer are all working correctly. However, it cannot access websites by name, which points to a DNS resolution failure. Since the router is set to automatic DNS but the workstation has a manually configured DNS server that is unreachable, the workstation will fail to resolve domain names into IP addresses, even though it can reach external IPs directly.

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The subnet mask is incorrect

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The network cable is faulty

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The router's DHCP server has exhausted its IP address pool

Question 8

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.

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The DHCP lease on the file server has expired.

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

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The workstations and file server are in different workgroups.

Question 9

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.

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The DNS server is not configured correctly

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Windows Firewall is blocking file and printer sharing

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Workgroups are not configured the same on all computers

Question 10

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.

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The file server's firewall is blocking ping requests.

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The workstation's DNS cache is corrupted.

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The file server's network cable is faulty.

Question 11

A network administrator is setting up a wired network for a small office that has 25 workstations, 2 file servers, and a router with 4 LAN ports. The office uses IP-based printers and VoIP phones. The administrator wants to minimize broadcast traffic and improve network performance by separating the workstations from the servers and printers. Which of the following is the BEST solution?

Accepted Answer

Use a single managed switch and configure port-based VLANs. A managed switch with port-based VLANs allows the network administrator to logically segment the workstations from the servers and printers on the same physical switch, reducing broadcast domain size and improving performance. VLANs isolate broadcast traffic to only the ports within the same VLAN, so workstations do not see broadcasts from servers or printers, and vice versa. This solution uses a single switch, which is cost-effective and simple to manage, while meeting the requirement to minimize broadcast traffic without needing multiple routers.

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Connect all devices to a single unmanaged switch

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Connect all devices to a hub instead of a switch

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Use multiple routers to separate networks

Question 12

A user moves their laptop from a conference room to their office and connects the Ethernet cable. The laptop shows a network connection with an IP address of 169.254.22.115 and a subnet mask of 255.255.0.0. The user cannot access the internet or any network resources. Which of the following is the MOST likely cause?

Accepted Answer

The DHCP server is unreachable or failed to assign an IP address. The IP address 169.254.22.115 with a subnet mask of 255.255.0.0 is an Automatic Private IP Addressing (APIPA) address, which Windows assigns when a DHCP server is unreachable or fails to respond. Since the user moved the laptop and connected via Ethernet, the most likely cause is that the DHCP server did not assign a valid IP address, leaving the device with a link-local address that cannot route to the internet or network resources.

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The subnet mask is incorrect

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The network interface card is faulty

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The DNS server address is misconfigured

Question 13

A user in a small office can access internal network resources by IP address but cannot access any websites by domain name. Other users on the same network can browse the internet without issues. The user's workstation obtains an IP address via DHCP and can successfully ping the default gateway. Which of the following is the MOST likely cause of the issue?

Accepted Answer

Incorrect DNS server address on the workstation. The user can access internal resources by IP address and ping the default gateway, confirming Layer 2/3 connectivity is intact. The inability to resolve domain names to IP addresses while other users can browse normally points directly to a DNS resolution failure. Since the workstation obtains its IP via DHCP, the most likely cause is that the DHCP server provided an incorrect or no DNS server address, or the workstation's DNS settings were manually misconfigured, preventing name resolution.

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Faulty network cable

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DHCP scope exhaustion

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Firewall blocking outbound traffic

Question 14

A user in a small office reports that they can access websites on the internet but cannot connect to the company's internal file server using its hostname (\fileserver). Other users in the same office can access the file server by hostname without any issues. The technician runs ipconfig /all on the affected workstation and sees the following: IPv4 Address: 192.168.1.45, Subnet Mask: 255.255.255.0, Default Gateway: 192.168.1.1, DNS Server: 8.8.8.8. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The workstation is using an external DNS server instead of the internal DNS server.. The workstation can access the internet (via 8.8.8.8) but cannot resolve the internal hostname 'fileserver' because it is using an external DNS server (Google's 8.8.8.8) instead of the internal DNS server that holds the private DNS records for the company's local resources. Internal DNS servers typically host A or CNAME records for internal hostnames, which public DNS servers like 8.8.8.8 do not contain. This mismatch prevents hostname resolution for the file server while leaving internet access functional.

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The workstation's subnet mask is incorrect.

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The default gateway is misconfigured.

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The DHCP scope is exhausted.

Question 15

An employee connects their laptop to the company network via Ethernet. They can access the internet but cannot connect to internal servers using their hostnames (e.g., \fileserver). They can ping internal server IPs. The network uses an internal DNS server at 192.168.1.5. The technician checks the laptop's network adapter settings and sees that the DNS server is manually set to 8.8.8.8. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The laptop is configured to use a public DNS server instead of the internal DNS server.. The laptop can access the internet and ping internal servers by IP, confirming that basic IP connectivity and routing are functional. However, it cannot resolve internal hostnames because its DNS server is manually set to 8.8.8.8 (a public Google DNS server), which does not have records for the company's internal domain. The internal DNS server at 192.168.1.5 is required to resolve names like \fileserver, so using an external DNS server breaks internal name resolution.

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The laptop's IPv4 address is outside the company's subnet.

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The DNS resolver cache on the laptop is corrupted.

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The internal DNS server is not responding to queries from different subnets.