220-1201 Practice Exam 62 — 20 Questions

Question 1

A technician is troubleshooting a home network where the 5 GHz band works fine, but the 2.4 GHz band is extremely slow and drops connections. The router is placed near a cordless phone base station. Which type of interference is most likely occurring?

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

Accepted Answer

RF interference from the cordless phone base. The 2.4 GHz band is shared by many consumer devices, including cordless phones that operate in the 2.4 GHz ISM band. The proximity of the router to the cordless phone base station causes RF interference, which degrades the 2.4 GHz signal, leading to slow speeds and dropped connections, while the 5 GHz band remains unaffected because it operates on a different frequency range.

Answer

Bluetooth interference

Answer

Microwave oven interference

Answer

Co-channel interference from a neighboring Wi-Fi network

Question 2

A technician is deploying a wireless network in a large warehouse and needs to ensure seamless roaming for handheld scanners as workers move between access points. Which technology should the technician configure to support this requirement?

Accepted Answer

Implement 802.11r Fast Roaming.. 802.11r Fast Roaming (also known as Fast BSS Transition) is the correct technology because it reduces the time required for a client device to re-authenticate and reassociate when moving between access points. In a large warehouse with handheld scanners, this minimizes latency and prevents disconnections during active sessions, ensuring seamless roaming. The other options either address security or basic connectivity but do not specifically optimize the handoff process.

Answer

Enable WPA2-PSK with AES encryption.

Answer

Set all access points to the same SSID and password.

Answer

Use a wireless controller with load balancing.

Question 3

A small business reports that employees can access the internet but cannot reach the internal company website hosted on a local server. The server's IP address is 192.168.1.10, and clients use DHCP. What is the most likely cause?

Accepted Answer

The DNS server lacks a host record for the internal website.. The internal website is accessed by its hostname, which clients resolve via DNS. Since employees can reach the internet (so general DNS works) but not the local server, the most likely cause is that the DNS server lacks a host record (A or AAAA record) for the internal website's name, preventing name-to-IP resolution for 192.168.1.10. DHCP is functioning correctly because clients receive IP addresses and can access the internet.

Answer

The DHCP server is not assigning the correct subnet mask.

Answer

The switch port connecting the server is administratively down.

Answer

The firewall is blocking port 443 inbound.

Question 4

A user configures their laptop to use a static IP address, subnet mask, and default gateway. They can ping other devices on the same subnet but cannot reach the internet. What network service is most likely missing from their configuration?

Accepted Answer

DNS server. A static IP configuration includes the IP address, subnet mask, and default gateway, but if the DNS server address is not manually set, the laptop cannot resolve domain names to IP addresses. Since the user can ping devices on the same subnet (local connectivity works) but cannot reach the internet, the missing DNS server prevents name resolution for external hosts, even though routing via the default gateway is functional.

Answer

DHCP server

Answer

NAT

Answer

Proxy server

Question 5

A user complains that they cannot access any websites, but they can ping external IP addresses like 8.8.8.8 successfully. Other devices on the same network work fine. Which network service is most likely failing on this user's computer?

Accepted Answer

DNS. The user can ping external IP addresses (e.g., 8.8.8.8) successfully, which confirms that IP connectivity, routing, and NAT are working. However, they cannot access websites by name, which requires DNS resolution to translate domain names into IP addresses. Since other devices on the same network work fine, the issue is isolated to this computer's DNS client configuration or service, making DNS the most likely failing service.

Answer

DHCP

Answer

NAT

Answer

Proxy

Question 6

A network administrator is deploying a new wireless network that requires users to authenticate using their domain credentials. The network uses WPA2-Enterprise. Which service must be configured to validate these credentials?

Accepted Answer

RADIUS. WPA2-Enterprise uses 802.1X authentication, which requires a RADIUS server to validate domain credentials against an authentication backend such as Active Directory. The RADIUS server acts as the Authentication Server (AS) in the 802.1X framework, receiving EAP packets from the access point and verifying the user's credentials before granting network access.

Answer

DHCP

Answer

DNS

Answer

NTP

Question 7

A technician is setting up a new file server and wants to ensure that clients can automatically obtain the server's IP address via a friendly name without manual configuration. Which network service should be configured on the server?

Accepted Answer

DNS. DNS (Domain Name System) resolves friendly hostnames (e.g., fileserver.company.local) to IP addresses, allowing clients to automatically discover the server without manual IP entry. DHCP assigns IP addresses dynamically, but does not provide name resolution; DNS is the correct service for mapping names to IPs.

Answer

DHCP

Answer

RADIUS

Answer

NTP

Question 8

A technician is troubleshooting an issue where a user's computer can access the internet but cannot connect to a network printer by its IP address. The printer is on the same subnet and is powered on. Pinging the printer's IP from the computer fails. Which network service is most likely causing the problem?

Accepted Answer

ARP. Since the computer can access the internet but cannot ping the printer on the same subnet, the issue is at Layer 2 (Data Link) rather than Layer 3 (Network). ARP (Address Resolution Protocol) is responsible for resolving a known IP address to a MAC address on the local subnet. If the ARP cache is corrupted, missing, or the printer fails to respond to ARP requests, the computer cannot build the correct Ethernet frame to reach the printer, causing the ping to fail even though the printer is powered on and on the same subnet.

Answer

DNS

Answer

DHCP

Answer

NAT

Question 9

A company uses a cloud-based VoIP service, and users report intermittent call drops and poor audio quality. Network monitoring shows high jitter and packet loss. Which service is most likely contributing to the problem?

Accepted Answer

The network is not prioritizing VoIP traffic via QoS.. High jitter and packet loss directly degrade real-time VoIP traffic, causing call drops and poor audio. QoS (Quality of Service) mechanisms like DiffServ or 802.1p prioritize voice packets over other traffic, ensuring low latency and consistent delivery. Without QoS, the network treats VoIP packets the same as bulk data, leading to the reported symptoms.

Answer

The DHCP server is leasing IP addresses with a short lease time.

Answer

The DNS server is responding slowly to queries.

Answer

The SIP server is overloaded with registration requests.

Question 10

A user reports that they cannot access any websites, but they can ping the IP address of a public DNS server (8.8.8.8). What is the most likely misconfigured network service?

Accepted Answer

DNS. The user can ping 8.8.8.8, confirming that IP connectivity and routing are working, but cannot access websites by name. This indicates that the system cannot resolve domain names to IP addresses, which is the function of DNS. A misconfigured DNS server address (e.g., pointing to a non-existent or unreachable DNS server) would cause this exact symptom.

Answer

DHCP

Answer

NAT

Answer

Proxy

Question 11

A technician is troubleshooting a network where two computers cannot communicate. Computer A has an IP of 192.168.1.10 with subnet mask 255.255.255.0. Computer B has an IP of 192.168.2.20 with subnet mask 255.255.255.0. Both are connected to the same switch. The switch is not configured with VLANs. Why can't the computers communicate?

Accepted Answer

The computers are on different subnets and need a router to communicate.. Computer A (192.168.1.10/24) and Computer B (192.168.2.20/24) are on different subnets because their subnet masks (255.255.255.0) define network IDs of 192.168.1.0 and 192.168.2.0 respectively. A switch operates at Layer 2 and forwards frames based on MAC addresses within the same broadcast domain, but it cannot route traffic between different subnets. For inter-subnet communication, a Layer 3 device such as a router (or a Layer 3 switch) is required to perform routing.

Answer

The switch is blocking the traffic due to MAC address filtering.

Answer

The subnet mask on Computer B is incorrect.

Answer

The default gateway on both computers is not set.

Question 12

A small office uses a single router with four LAN ports. The manager wants to connect 12 wired devices and ensure they can all communicate with each other without purchasing a new router. Which network device should be added to the existing setup?

Accepted Answer

Switch. A switch is the correct device because it operates at Layer 2 (Data Link layer) of the OSI model, using MAC addresses to forward frames only to the specific port where the destination device is connected. This allows the existing router to remain the gateway for internet access while the switch expands the number of available Ethernet ports, enabling all 12 wired devices to communicate within the same local network without purchasing a new router.

Answer

Hub

Answer

Router

Answer

Repeater

Question 13

A technician is troubleshooting a connectivity issue where a user's computer can ping the default gateway but cannot access a web server at 203.0.113.50. The technician runs a tracert and sees that the first hop responds, but subsequent hops time out. What is the most likely cause?

Accepted Answer

A router along the path is misconfigured or dropping packets.. The tracert output shows the first hop (the default gateway) responds, confirming the user's computer can reach the local network. The subsequent timeouts indicate that packets are being dropped or discarded beyond the gateway, which points to a misconfigured router or a router along the path that is dropping packets (e.g., due to an ACL, routing loop, or MTU issue). This explains why the user can ping the gateway but cannot reach the web server at 203.0.113.50.

Answer

The default gateway is down.

Answer

The web server is offline.

Answer

The user's computer has a duplicate IP address.

Question 14

A technician is configuring a new wireless router for a home office. The customer wants to ensure that guests can access the internet but cannot see other devices on the main network. Which feature should the technician enable on the router?

Accepted Answer

Guest network. Enabling a guest network creates a separate SSID and VLAN (or subnet) that isolates guest traffic from the main LAN. This prevents guests from accessing local devices (e.g., printers, file shares) while still providing internet access through the router's NAT. The isolation is typically achieved via client isolation or AP isolation settings, ensuring Layer 2 separation between the guest and main networks.

Answer

MAC address filtering

Answer

Port forwarding

Answer

WPS (Wi-Fi Protected Setup)

Question 15

A user reports that their laptop can connect to the corporate Wi-Fi but cannot access any network resources. The technician checks the IP configuration and sees an IP address of 192.168.1.105 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully but cannot ping a server at 192.168.2.10. What is the most likely issue?

Accepted Answer

The default gateway does not have a route to the 192.168.2.0 subnet.. The technician can ping the default gateway (192.168.1.1) but not the server at 192.168.2.10, indicating that Layer 3 connectivity exists within the local subnet but fails beyond it. This points to a routing issue on the default gateway, which likely lacks a route to the 192.168.2.0/24 network. Without that route, the gateway cannot forward packets destined for the server, even though the laptop's IP configuration is correct.

Answer

The laptop's DNS server is misconfigured.

Answer

The server at 192.168.2.10 is offline.

Answer

The laptop's subnet mask is incorrect.

Question 16

A network administrator needs to segment traffic between the accounting and HR departments to prevent unauthorized access, while still allowing both to reach the internet. The company uses a single managed switch and a router. Which configuration approach meets these requirements?

Accepted Answer

Configure VLANs on the switch and set up a trunk port to the router with subinterfaces. VLANs logically segment traffic between departments on a single switch, and configuring a trunk port to the router with subinterfaces (using VLAN tagging) allows inter-VLAN routing for internet access while maintaining isolation between the accounting and HR VLANs. This approach meets the requirement of preventing unauthorized access between departments while enabling shared internet connectivity through the router.

Answer

Create two separate subnets and connect each department to a different physical switch

Answer

Assign static IPs to all devices and enable MAC address filtering on the switch

Answer

Use a firewall between the two departments and disable inter-VLAN routing

Question 17

A user reports that their laptop cannot connect to the internet, but other devices on the same wired network work fine. The technician checks the IP configuration and sees the laptop has an IP address of 169.254.3.12. What is the most likely cause?

Accepted Answer

The DHCP server is not responding. The IP address 169.254.3.12 falls within the Automatic Private IP Addressing (APIPA) range (169.254.0.0/16), which Windows assigns when a DHCP discovery broadcast fails to receive a response. Since other devices on the same wired network work fine, the issue is isolated to this laptop's inability to reach the DHCP server, most likely due to a local configuration problem or a faulty network interface.

Answer

The DNS server is unreachable

Answer

The default gateway is misconfigured

Answer

The network cable is faulty

Question 18

A network administrator is configuring a new firewall to allow remote employees to securely access internal resources. The requirement is to encrypt all traffic between the remote client and the internal network. Which protocol should be used?

Accepted Answer

IPsec. IPsec is the correct choice because it provides end-to-end encryption at the network layer (Layer 3), securing all IP traffic between a remote client and an internal network. It operates in tunnel mode to encapsulate the entire original IP packet, ensuring confidentiality, integrity, and authentication for remote access VPNs. SSL/TLS operates at the transport layer and is typically used for securing individual application sessions (e.g., HTTPS), not for encrypting all traffic from a remote client to an entire internal network.

Answer

SSL/TLS

Answer

L2TP

Answer

HTTP

Question 19

A technician is troubleshooting a network where users report intermittent connectivity. The technician finds that the switch logs show excessive CRC errors on multiple ports connected to different workstations. What is the most likely cause of these errors?

Accepted Answer

The Ethernet cables are run too close to power cables. CRC errors indicate data corruption at the physical layer, typically caused by electromagnetic interference (EMI) from nearby power cables. Running Ethernet cables too close to power cables induces noise, corrupting frames and causing CRC mismatches at the switch port.

Answer

The switch is configured with the wrong VLAN assignments

Answer

The workstations have duplicate IP addresses

Answer

The switch firmware is outdated

Question 20

A user complains that their laptop frequently disconnects from the Wi-Fi when they move to a different room, but other devices in that room work fine. The technician checks the laptop's wireless adapter settings. Which configuration is most likely causing the issue?

Accepted Answer

Power saving mode is enabled on the wireless adapter. Power saving mode on the wireless adapter reduces power consumption by periodically turning off the radio, which can cause intermittent disconnections when the laptop moves between rooms and the signal strength fluctuates. This is a common issue because the adapter may not maintain a stable connection as it transitions between access points or renegotiates power-saving states.

Answer

The SSID is hidden

Answer

The wireless mode is set to 802.11a only

Answer

The channel width is set to 40 MHz