220-1101 Networking Practice Test 2 — 15 Questions

Question 1

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?

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

Accepted Answer

The server's firewall is blocking ICMP. The server can ping its own IP, indicating its IP stack is functioning. It can also ping the router, which confirms local network connectivity (the router is on the same subnet). Since workstations can reach the router but not the server, the issue is isolated to the server. The most likely cause is a host-level firewall blocking inbound ICMP echo requests, a common default 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 2

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 3

A technician is configuring a new VLAN for the accounting department on a managed switch. The switch is connected to a router-on-a-stick configuration for inter-VLAN routing. The technician creates VLAN 30 (Accounting) on the switch, assigns ports 6-10 to access mode in VLAN 30, and configures the switch's trunk port to the router to allow VLAN 30. The router's subinterface for VLAN 30 is configured with IP address 192.168.30.1/24. A workstation on port 6 (static IP 192.168.30.10/24) cannot communicate with a server on VLAN 20 (192.168.20.50/24) that it could reach previously when both were on the same VLAN. Other workstations in VLAN 30 can ping the router's subinterface (192.168.30.1). Which of the following is the MOST likely cause of the issue?

Accepted Answer

The workstation's default gateway is incorrect. The workstation can ping the router's subinterface (192.168.30.1) because both are on the same /24 subnet; this does not require a default gateway. To communicate with the server on VLAN 20 (192.168.20.50), the workstation must send traffic to its default gateway, which is the router. If the default gateway is not set to 192.168.30.1 or is misconfigured, the workstation will not be able to route off-subnet, even though it can still reach the router. The router has no ACL configured, and the symptoms are consistent with a default gateway issue.

Answer

The trunk port is not tagging VLAN 30 correctly

Answer

The server's IP address is on a different subnet than its VLAN

Answer

An ACL on the router is blocking traffic from VLAN 30 to VLAN 20

Question 4

A small office uses a DHCP server to assign IP configurations. A new laptop obtains an IP address of 192.168.1.50/24, default gateway 192.168.1.1, and DNS server 10.0.0.1. The laptop can ping the gateway and other local devices, but cannot resolve any domain names. Other devices on the network, which have the DNS server 192.168.1.10 configured, can access the internet without issues. Which of the following is the MOST likely cause?

Accepted Answer

The DNS server 10.0.0.1 is not reachable from this subnet. The laptop received a DNS server address of 10.0.0.1 via DHCP, which is on a different subnet (10.0.0.0/24) from the laptop's 192.168.1.0/24 network. Because the laptop has a default gateway of 192.168.1.1, it will forward traffic to 10.0.0.1 through that gateway. However, the gateway or routing infrastructure likely has no route to the 10.0.0.0/24 network, or the address 10.0.0.1 is not a functioning DNS server. Other devices on the same 192.168.1.0/24 subnet use the correct DNS server 192.168.1.10 and work fine, so the laptop's issue is specific to the DNS assignment from DHCP. The inability to resolve names while being able to ping local devices points directly to a DNS reachability or configuration problem.

Answer

The laptop's default gateway is incorrect

Answer

The laptop has a software firewall blocking DNS requests

Answer

The internet connection is down

Question 5

A small office network has two managed switches, Switch A and Switch B, connected via a trunk link. Switch A has VLAN 10 (192.168.10.0/24) and VLAN 20 (192.168.20.0/24) configured. Switch B has only VLAN 10 configured. A router-on-a-stick is connected to Switch A and performs inter-VLAN routing. A workstation connected to an access port on Switch B in VLAN 10 can ping other devices in VLAN 10 on both switches, but it cannot ping a server in VLAN 20 that is connected to Switch A. The trunk port on Switch B is configured to allow all VLANs. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The router's subinterface for VLAN 20 has an incorrect IP address or subnet mask.. The workstation in VLAN 10 can communicate across the trunk to Switch A, confirming that the trunk carries VLAN 10 successfully. Inter-VLAN routing requires the workstation to send traffic to its default gateway (the router). The router then routes to VLAN 20 and delivers the traffic to the server, which is directly attached to Switch A. VLAN 20 frames never need to cross the trunk between Switch A and Switch B, because no VLAN 20 devices exist on Switch B. Therefore, the most likely cause of the failure is an incorrect IP address or subnet mask on the router's VLAN 20 subinterface, which prevents proper routing to the server's network.

Answer

The trunk port on Switch A is not configured to allow VLAN 20 traffic.

Answer

The workstation's default gateway is set incorrectly.

Answer

The switchport mode on Switch B's trunk port is set to access mode.

Question 6

A small office network uses a single managed switch connected to a router. A workstation is configured with a static IP address of 10.0.0.50/24, default gateway 10.0.0.1, and DNS server 10.0.0.10. The workstation can successfully ping other workstations on the same local subnet, but it cannot ping the default gateway (10.0.0.1) or access the internet. The technician checks the router and finds that the router's interface connected to the switch has IP address 10.0.0.1/24. The switch port connecting the router is configured as an access port on VLAN 1. The workstation's switch port is configured as an access port on VLAN 10. Other workstations on VLAN 10 have the same issue. Which of the following is the MOST likely cause?

Accepted Answer

The switch is not trunking to the router. The workstation is on VLAN 10, but the switch port connected to the router is configured as an access port on VLAN 1. This places the router's interface in VLAN 1 and prevents it from receiving any VLAN 10 traffic. The workstation's ARP requests for the default gateway (10.0.0.1) remain isolated to VLAN 10, so the router never responds. The router must have Layer 2 access to VLAN 10, either by changing the switch port to an access port on VLAN 10 or by configuring the link as a trunk with a subinterface for VLAN 10. Since the switch port is not a trunk, the lack of a subinterface is not the root cause; the absence of trunking (or proper VLAN assignment) is the issue.

Answer

The router's interface does not have a subinterface configured for VLAN 10

Answer

The default gateway IP address is incorrect

Answer

The DNS server is unreachable

Question 7

A small office network consists of a router (192.168.1.1/24) connected to a managed switch. The switch has all ports configured as access ports on VLAN 1. A workstation obtains an IP address of 192.168.1.50/24 from the DHCP server running on the router. The workstation can successfully ping other workstations in the same subnet but cannot ping the default gateway (192.168.1.1). The router's LAN interface is configured with IP address 10.0.0.1/24. Which of the following is the MOST likely cause?

Accepted Answer

The router's LAN interface is on a different subnet than the workstations.. The router's LAN interface is configured with IP address 10.0.0.1/24, while the workstation has an IP address of 192.168.1.50/24. Since these are on different subnets, the workstation cannot reach the default gateway (192.168.1.1) because that address does not exist on the router's LAN interface. The router will not respond to ARP requests for 192.168.1.1, and the workstation cannot send traffic outside its own subnet without a valid gateway on the same subnet.

Answer

The workstation's default gateway is set incorrectly due to a DHCP scope misconfiguration.

Answer

The switch port the workstation is connected to is in the wrong VLAN.

Answer

The Ethernet cable is faulty.

Question 8

A user configures a workstation with a static IP address of 192.168.1.50, subnet mask 255.0.0.0, default gateway 192.168.1.1, and DNS server 8.8.8.8. The workstation can ping other computers on the local network (e.g., 192.168.1.100) but cannot ping the default gateway (192.168.1.1) or access the internet. Other workstations using DHCP on the same network have no issues. Which of the following is the MOST likely cause?

Accepted Answer

The default gateway IP address is incorrect; it should be 192.168.0.1.. With subnet mask 255.0.0.0, the workstation is in the 192.0.0.0/8 network. Both its own IP (192.168.1.50) and the default gateway (192.168.1.1) have the same first octet, so the gateway is considered to be on the same local subnet. Therefore, the workstation will send ARP requests directly to the gateway. If the gateway IP is not actually present on the network (e.g., the correct gateway is 192.168.0.1), the ping fails. DNS is irrelevant to IP ping, and an IP conflict would typically cause intermittent issues, not a consistent inability to ping the gateway. The most likely cause is an incorrect default gateway address.

Answer

The subnet mask is incorrectly set to 255.0.0.0, causing the gateway to be considered a remote host.

Answer

The DNS server address is incorrect; the workstation should use a local DNS server.

Answer

The static IP address conflicts with another device on the network.

Question 9

A technician replaced an unmanaged network switch with a new managed switch in a small office. After reconnecting all devices, some workstations can access the internet, but others cannot. The workstations that cannot access the internet are physically connected to the switch and their link lights are on. The technician checks the switch configuration and finds that all ports are set to 'trunk' mode by default. The router is connected to port 1, which is also set to trunk mode. Which of the following is the MOST likely cause?

Accepted Answer

The switch ports that are connected to workstations need to be configured as access ports instead of trunk ports. Managed switch trunk ports are designed to carry multiple VLANs between switches/routers and tag frames with 802.1Q, except on the native VLAN. Workstations send untagged frames and expect an access port assigned to one VLAN. Connecting workstations to trunk ports is a misconfiguration: their untagged frames will be placed into the trunk's native VLAN, which may work only if that native VLAN aligns with the router's configuration, but it is not the correct design and can cause the partial connectivity described. The workstation ports should be changed to access ports.

Answer

The router does not support trunking

Answer

The Ethernet cables are faulty

Answer

The workstations have incorrect IP settings

Question 10

A technician configures a new workstation with a static IP address of 10.0.0.5, subnet mask 255.255.255.0, default gateway 10.0.0.1, and DNS server 8.8.8.8. The workstation can ping the gateway (10.0.0.1) but cannot ping any external IP addresses like 8.8.8.8 or access the internet. Other workstations on the same network using DHCP are working fine. The router's WAN connection is working. Which of the following is the MOST likely cause?

Accepted Answer

The IP address conflicts with another device on the network.. The workstation can ping its default gateway, confirming local IP configuration and Layer 2/3 connectivity to the router. Other DHCP clients on the same network can access the internet, proving the router's routing and WAN link are functional. Therefore the issue is specific to this static IP. The most likely cause is an IP address conflict: another device on the network may already be using 10.0.0.5, causing the router's ARP cache to associate that IP with the wrong MAC address. This allows local gateway pings to succeed (since the communication is to/from the same MAC) but breaks return traffic from external IPs, as the router sends replies to the wrong device. DNS is not involved because 8.8.8.8 is an IP address, not a hostname.

Answer

The default gateway is in a different subnet.

Answer

The router is not configured with a route back to the 10.0.0.0 network.

Answer

The DNS server is not reachable.

Question 11

A technician is troubleshooting a workstation that can access local network resources and can successfully ping external IP addresses like 8.8.8.8, but cannot browse any websites using a web browser. Other workstations on the same network are able to browse the internet normally. The workstation's IP configuration is static: IP 192.168.1.50, subnet mask 255.255.255.0, default gateway 192.168.1.1, DNS server 192.168.1.1. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The DNS server 192.168.1.1 is not a functional DNS resolver, so the workstation cannot resolve domain names to IP addresses. The DNS server 192.168.1.1 is not a functional DNS resolver, so the workstation cannot resolve domain names to IP addresses. The ability to ping 8.8.8.8 proves IP connectivity and routing are working, but browsing requires resolving website names like example.com to IP addresses via DNS; since the workstation's only DNS server is 192.168.1.1 and other workstations browse normally, this host likely has an incorrect or non-resolving DNS entry. Option B is unlikely because a proxy misconfiguration would not typically affect all browsers uniformly and would not be the most probable cause given the DNS-specific symptom. Option C is unlikely because a firewall blocking port 443 would still allow HTTP (port 80) browsing and would not explain the name-resolution failure. Option D is unlikely because a corrupted TCP/IP stack would usually break ping and local network access as well, not just website browsing.

Answer

The web browser has proxy settings configured that are blocking all web traffic

Answer

The Windows firewall is blocking HTTPS traffic (port 443)

Answer

The network adapter TCP/IP stack is corrupted and needs to be reset

Question 12

A user's workstation is connected to a network switch. The workstation can access the internet and other network resources, but network transfers are extremely slow. The technician runs a speed test and gets 10 Mbps download, but the internet plan is 500 Mbps. The technician checks the switch port and sees the link light is green but blinking slowly. The technician connects a laptop to the same cable and gets 500 Mbps. Which of the following is the MOST likely cause?

Accepted Answer

The workstation's network adapter is configured for half duplex. A is correct because a half-duplex network adapter can only transmit or receive at one time and uses CSMA/CD to handle collisions. A duplex mismatch with the switch can severely degrade throughput. Since a laptop on the same cable achieves full speed, the cable and switch port are ruled out, leaving the workstation's NIC settings as the cause. The adapter may also be forced to 10 Mbps, explaining the exact speed test result.

Answer

The Ethernet cable is damaged

Answer

The switch port is faulty

Answer

The workstation has a virus consuming bandwidth

Question 13

A user reports that their workstation can access internal network resources by IP address (e.g., \192.168.1.100\share) and can browse the internet using IP addresses (e.g., http://8.8.8.8), but cannot access any resources by hostname (e.g., \fileserver\share or www.example.com). Other workstations on the same subnet can resolve hostnames without issue. The workstation obtains its IP address via DHCP. The technician runs ipconfig and sees: IP: 192.168.1.105, Subnet Mask: 255.255.255.0, Default Gateway: 192.168.1.1, DNS Server: 192.168.1.1. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The DNS resolver cache on the workstation is corrupted or contains invalid entries.. The workstation can reach resources by IP address but not by hostname, indicating a name resolution problem. Since other workstations on the same subnet resolve hostnames correctly, the DNS server (192.168.1.1) is functioning properly. The issue is isolated to this workstation, making a corrupted DNS resolver cache the most likely cause. Clearing the cache with `ipconfig /flushdns` would force fresh queries and resolve the issue. Option B is incorrect because the DNS server address shown is correct (192.168.1.1) and DHCP exhaustion would produce an APIPA address, not a valid one. Option C is incorrect because NetBIOS over TCP/IP is used for NetBIOS name resolution, not DNS-based hostname resolution used for accessing websites and UNC paths by hostname. Option D is incorrect because workgroup or domain membership does not affect general hostname resolution via DNS; it affects browsing network resources in Active Directory but not basic name resolution.

Answer

The DHCP scope is exhausted, and the workstation received an incorrect DNS server address.

Answer

NetBIOS over TCP/IP is disabled on the workstation, preventing NetBIOS name resolution.

Answer

The workstation is in the wrong workgroup or domain, so it cannot resolve remote hostnames.

Question 14

A technician is terminating an Ethernet cable for a 1000BASE-T network. The technician uses the T568A standard on one end and T568B on the other. Which of the following describes the resulting cable type?

Accepted Answer

Crossover. A crossover cable is created when one end is terminated with T568A and the other with T568B. This swaps pins 1-2 with pins 3-6 (the green and orange pairs), while pins 4-5 and 7-8 remain in the same positions. For 1000BASE-T, all four pairs are used bidirectionally, and a true gigabit crossover would also swap pairs 4-5 and 7-8, but the simple T568A/B termination still produces a cable commonly called a crossover. Therefore, the correct answer is B: Crossover.

Answer

Straight-through

Answer

Rollover

Answer

Loopback

Question 15

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.

Answer

A hub

Answer

A bridge

Answer

A router