220-1101 Networking Practice Test 8 — 15 Questions

Question 1

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?

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

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 2

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 3

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.

Question 4

A small office network uses a 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. Workstations on the same subnet can ping the router (192.168.1.1) and other workstations, 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 and conflicts with a lease assigned to another device.. The printer's static IP address 192.168.1.150 falls within the DHCP scope (192.168.1.0/24). If the DHCP server has already leased that address to another device, a conflict occurs. The printer can ping its own IP and the router because its local stack and gateway are configured correctly, but workstations cannot reach it because the router's ARP table or the switch may map the IP to the wrong MAC address, or the conflicting device actively responds to ARP requests, causing communication failures.

Answer

The printer's default gateway is set incorrectly.

Answer

The printer's subnet mask is incorrect.

Answer

The switch port the printer is connected to is malfunctioning.

Question 5

A technician is configuring a small office network with a managed switch. The network has two VLANs: VLAN 10 for workstations (192.168.10.0/24) and VLAN 20 for servers (192.168.20.0/24). The switch ports for workstations are set to access mode and assigned to VLAN 10. The server ports are also set to access mode and assigned to VLAN 20. The router is connected to one of the switch ports and is configured with subinterfaces (192.168.10.1 on VLAN 10 and 192.168.20.1 on VLAN 20) to route between VLANs. A workstation on VLAN 10 cannot ping a server on VLAN 20. The workstation can ping other workstations on VLAN 10. The technician has verified the router subinterfaces are configured correctly. Which of the following is the MOST likely cause of the problem?

Accepted Answer

B. The workstation can ping other workstations on VLAN 10, confirming Layer 2 connectivity within the VLAN. The router subinterfaces are correctly configured, so the issue is likely that the switch port connecting to the router is not configured as a trunk port. Without a trunk, the switch cannot carry both VLAN 10 and VLAN 20 traffic to the router, preventing inter-VLAN routing.

Answer

A

Answer

C

Answer

D

Question 6

A user reports that their workstation cannot access network resources. The technician runs ipconfig and sees the following: IP address: 192.168.1.100, Subnet mask: 255.255.255.0, Default gateway: 192.168.1.1. The technician pings 127.0.0.1 (success), pings 192.168.1.100 (success), but pinging 192.168.1.1 fails. Other workstations on the same subnet can ping the default gateway successfully. The cable is connected and the link light is on. Which of the following is the MOST likely cause?

Accepted Answer

Duplicate IP address.. The workstation has a valid IP address and subnet mask, and the loopback (127.0.0.1) and its own IP (192.168.1.100) respond to ping, confirming the TCP/IP stack and network interface are working. The failure to ping the default gateway (192.168.1.1) while other workstations on the same subnet can reach it indicates a local issue. A duplicate IP address on the network would cause the workstation to receive no reply from the gateway because the gateway's ARP table may map the IP to another device's MAC address, or the duplicate device may respond with a conflicting ARP reply, preventing proper communication.

Answer

DNS server is not configured.

Answer

Incorrect subnet mask.

Answer

Firewall on the workstation blocking ICMP.

Question 7

A technician is setting up a small office network. The router is configured with DHCP and provides addresses in the 192.168.1.0/24 range. A workstation obtains an IP address of 192.168.1.15 but cannot access any external websites. The workstation can ping the default gateway (192.168.1.1) and other local workstations. Which of the following is the most likely cause?

Accepted Answer

The DNS server address is not configured. The workstation can ping the default gateway and local devices, confirming that Layer 3 connectivity and the default gateway are functional. However, it cannot access external websites, which typically requires DNS resolution to translate domain names to IP addresses. Since the router's DHCP is configured but the workstation lacks a DNS server address, name resolution fails, preventing web access while IP-level communication remains intact.

Answer

The workstation's subnet mask is incorrect

Answer

The default gateway is not set

Answer

The router's DHCP pool is exhausted

Question 8

A technician is troubleshooting a workstation that is connected to a managed switch. The link lights on both the workstation and switch are illuminated, but the workstation cannot obtain an IP address from the DHCP server. The technician manually configures a static IP address (192.168.1.100, subnet mask 255.255.255.0, default gateway 192.168.1.1) on the workstation, but it still cannot ping the router (192.168.1.1). Other workstations on the same switch can ping the router successfully. Which of the following is the MOST likely cause of this issue?

Accepted Answer

Speed/duplex mismatch between the switch port and the workstation NIC. The link lights are on, indicating Layer 1 connectivity, but the inability to obtain a DHCP lease or ping the gateway despite a correct static IP suggests a Layer 2 issue. A speed/duplex mismatch causes excessive frame errors and collisions, effectively breaking communication even though the physical link appears active. This is the most likely cause because other workstations on the same switch work fine, isolating the problem to the specific switch port or workstation NIC configuration.

Answer

Duplicate IP address on the network

Answer

Incorrect subnet mask

Answer

Damaged Ethernet cable

Question 9

A technician sets up a small office network. The router is configured with DHCP providing addresses in the 192.168.1.0/24 range. A new employee's laptop obtains an IP address of 192.168.1.50, subnet mask 255.255.255.0, and default gateway 192.168.1.1. The laptop can ping other local workstations and the router (192.168.1.1), but cannot access any external websites by domain name or IP address. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The router's WAN connection is not properly configured or is down.. The laptop can ping the local router (192.168.1.1) and other local workstations, which confirms that the laptop's IP configuration (address, subnet mask, default gateway) is correct and that the local LAN is functioning. However, the inability to reach any external websites by either domain name or IP address indicates that the router cannot forward traffic beyond its local subnet. The most likely cause is that the router's WAN connection is not properly configured or is down, preventing any outbound traffic from reaching the internet.

Answer

The laptop's DNS server configuration is incorrect.

Answer

The default gateway is not set correctly on the laptop.

Answer

A firewall on the router is blocking all outbound traffic from the laptop.

Question 10

A technician connects a new workstation to a wall jack in an office. The link lights on both the workstation's NIC and the switch port are solid green. The workstation cannot obtain an IP address via DHCP. The technician manually assigns a static IP address in the same subnet as other working workstations (192.168.1.100/24, gateway 192.168.1.1), but the workstation still cannot ping the gateway or any other device on the network. Other workstations connected to the same switch can access network resources normally. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The switch port has port security enabled, and the workstation's MAC address is not allowed. The solid link lights indicate Layer 1 connectivity is good, ruling out a faulty cable. The inability to obtain an IP via DHCP and the failure to ping the gateway even with a manually assigned static IP in the correct subnet point to a Layer 2 filtering mechanism. Port security on the switch port is the most likely cause, as it would block all traffic from an unauthorized MAC address, preventing DHCP discovery and any subsequent communication, even with a valid static IP.

Answer

The IP address 192.168.1.100 is already in use by another device

Answer

The Ethernet cable is faulty

Answer

The DHCP server has exhausted its IP address pool

Question 11

A company uses a managed PoE switch to power IP phones. A new IP phone is connected to a wall jack that is patched to the switch. The switch port shows 'not powered' in the management interface, even though PoE is enabled globally and the phone is known to work. Which of the following is the MOST likely cause?

Accepted Answer

The PoE power budget for the switch has been exceeded. The most likely cause is that the PoE power budget for the switch has been exceeded. Even though PoE is enabled globally, the switch can only supply a finite amount of total power (e.g., 370W for a Cisco 3750X). If the cumulative power draw of all connected devices surpasses this budget, the switch will deny power to new devices, showing the port as 'not powered' while the phone itself is known to work.

Answer

The patch cable is a crossover cable

Answer

The IP phone requires a higher PoE standard than the switch supports

Answer

The port is administratively disabled

Question 12

A small office network uses a managed switch with port security enabled. A new employee connects their laptop to a configured port, but the laptop cannot obtain an IP address or communicate on the network. The link light on the switch port is on. Other ports in the same VLAN work correctly. Which of the following is the MOST likely cause?

Accepted Answer

The switch port has MAC address filtering enabled that does not include the laptop's MAC. Port security with MAC address filtering restricts which devices can communicate through a switch port based on their MAC address. Since the link light is on (Layer 1 is up) but the laptop cannot obtain an IP address or communicate, the switch is likely dropping frames from the laptop's MAC because it is not in the allowed MAC list. This prevents DHCP discovery and all other traffic, even though the physical connection is established.

Answer

The switch port is administratively shut down

Answer

The laptop has a static IP address that conflicts with another device

Answer

The switch port is not in the correct VLAN

Question 13

A workstation is connected to a managed switch. It obtains a valid IP address (192.168.10.50) from the DHCP server, but it cannot ping the default gateway (192.168.10.1). The link light on both the workstation NIC and the switch port are solid green. Other workstations on the same switch CAN ping the default gateway successfully. The technician accesses the switch management interface and finds that the workstation's port is configured as an access port on VLAN 10. The default gateway is located on VLAN 20. An inter-VLAN router is configured but not explicitly allowing VLAN 10 access to VLAN 20. Which of the following is the MOST likely cause of the problem?

Accepted Answer

The switch port is assigned to VLAN 10, while the default gateway exists on VLAN 20, preventing connectivity without proper inter-VLAN routing.. The workstation is on VLAN 10, but the default gateway is on VLAN 20. Without inter-VLAN routing explicitly allowing traffic between VLAN 10 and VLAN 20, the workstation cannot reach the gateway, even though it has a valid IP address from the correct subnet. The link lights are solid green, indicating Layer 1 connectivity is fine, and other workstations on the same switch can ping the gateway, confirming the switch and gateway are operational.

Answer

The workstation's IP address is from a different subnet than the default gateway.

Answer

The workstation's network interface card (NIC) is malfunctioning.

Answer

The DHCP server provided an incorrect default gateway address.

Question 14

A technician configured a workstation with a static IP address of 192.168.1.100, subnet mask 255.255.255.0, default gateway 192.168.1.1, and DNS server 8.8.8.8. The workstation can successfully ping the default gateway and other local devices on the same subnet. However, the user cannot browse any websites. The technician verifies that the internet connection is working from other devices on the network. Which of the following is the MOST likely reason the workstation cannot access websites?

Accepted Answer

The DNS server is unreachable, preventing domain name resolution.. The workstation can ping the default gateway and local devices, confirming that Layer 3 IP connectivity and the subnet mask are correct. However, it cannot browse websites, which requires DNS resolution to translate domain names into IP addresses. Since the DNS server 8.8.8.8 is unreachable (possibly blocked or not responding), the browser cannot resolve website names, even though internet connectivity exists for other devices.

Answer

The default gateway is incorrect.

Answer

The subnet mask is incorrect.

Answer

The workstation has a duplicate IP address.

Question 15

A user reports that their desktop computer loses network connectivity every few minutes, especially when the nearby overhead fluorescent lights are turned on. The technician observes that the link light on the NIC occasionally turns off during these events. The Ethernet cable is a Cat5e unshielded twisted pair (UTP) cable routed through the ceiling near the light fixtures. Which of the following is the MOST likely cause of the intermittent connectivity?

Accepted Answer

Electromagnetic interference (EMI) from the fluorescent lights is affecting the unshielded cable. Unshielded twisted pair (UTP) cables lack shielding against electromagnetic interference (EMI). Fluorescent lights, especially older magnetic-ballast fixtures, generate strong EMI that can induce noise in nearby UTP cables, corrupting data signals and causing the NIC's link light to drop. This explains the correlation between the lights turning on and the loss of connectivity.

Answer

The network interface card (NIC) is faulty and needs replacement

Answer

The switch port is configured with an incorrect VLAN assignment

Answer

The DHCP server has exhausted its IP address scope