220-1201 Wireless Networking Technologies Practice Test 2 — 15 Questions

Question 1

During a site survey, a technician finds that a new access point on the 2.4 GHz band is experiencing heavy interference. The access point automatically selected channel 6. Which action should the technician take to minimize interference?

Accepted Answer

Change the channel to 1 or 11.. In the 2.4 GHz band, channels 1, 6, and 11 are non-overlapping. If channel 6 is congested, switching to 1 or 11 can reduce interference from neighboring networks.

Answer

Enable WPA3 encryption to reduce interference.

Answer

Set the channel width to 40 MHz.

Answer

Disable the 2.4 GHz radio and use only 5 GHz.

Question 2

A client reports that their 5 GHz Wi-Fi connection works fine near the access point but drops out completely when they move to the next room, which has thick concrete walls. The 2.4 GHz band works throughout the house. Which of the following is the BEST solution?

Accepted Answer

Deploy a mesh Wi-Fi system with nodes in each room.. 5 GHz signals attenuate more through obstacles like concrete. A mesh system with multiple nodes can extend coverage by relaying the signal, overcoming the wall issue.

Answer

Replace the access point with a higher-gain antenna.

Answer

Install a wireless repeater in the next room.

Answer

Switch the client to 2.4 GHz only.

Question 3

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) allows clients to re-authenticate quickly when moving between access points, reducing latency and preventing disconnects during handoffs.

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 4

A user complains that their laptop frequently disconnects from the Wi-Fi when they move to the conference room, which is 50 feet from the access point through two walls. The network uses 5 GHz. What is the MOST likely cause of the disconnects?

Accepted Answer

5 GHz signals have poor penetration through walls.. 5 GHz signals have higher frequencies, which attenuate more quickly through obstacles like walls compared to 2.4 GHz. This explains the disconnects at a distance with obstructions.

Answer

The access point is overloaded with too many clients.

Answer

The laptop's power management settings are turning off the Wi-Fi adapter.

Answer

The conference room has a metal door that blocks the signal.

Question 5

A client reports that their new 802.11ac laptop cannot connect to the office Wi-Fi, while older 802.11n devices work fine. The access point is a dual-band model. Which of the following is the MOST likely reason?

Accepted Answer

The 5 GHz radio on the access point is disabled.. 802.11ac operates exclusively on the 5 GHz band, so if the 5 GHz radio is disabled or the SSID is hidden, the laptop cannot connect. This tests knowledge of 802.11ac's band requirement and dual-band configuration.

Answer

The laptop's Wi-Fi antenna is damaged.

Answer

The laptop's drivers are not compatible with 802.11n.

Answer

The access point is set to 802.11b-only mode.

Question 6

A customer reports that their laptop frequently disconnects from the Wi-Fi in their home office, but works fine in other rooms. The office is located in a detached garage, and the wireless router is in the main house. Which wireless networking technology would best solve this issue without running cables?

Accepted Answer

Wireless mesh network. This scenario describes a long-range, obstruction-heavy connection. A wireless mesh network uses multiple nodes to extend coverage and maintain a stable connection, making it ideal for outbuildings. Powerline adapters are wired alternatives, and range extenders can cause performance drops. 5 GHz has shorter range and poorer penetration through walls.

Answer

5 GHz frequency band

Answer

Powerline networking adapters

Answer

802.11ac standard

Question 7

A small business owner wants to set up a guest Wi-Fi network that is isolated from the main corporate network to prevent unauthorized access to sensitive data. The wireless router supports multiple SSIDs. Which configuration should be applied to achieve this isolation?

Accepted Answer

Assign the guest SSID to a different VLAN. VLANs logically separate traffic on the same physical network, so a guest VLAN on a separate SSID isolates guest traffic from the corporate network. Simply using a different SSID name or encryption does not provide isolation. Disabling DHCP would break connectivity.

Answer

Use a different SSID name for guests

Answer

Enable WPA2 encryption on the guest network

Answer

Disable DHCP on the guest SSID

Question 8

A customer reports that their wireless printer stops responding when the microwave is in use. The printer is connected via Wi-Fi to a dual-band router. Which troubleshooting step should the technician take first to resolve this issue?

Accepted Answer

Connect the printer to the 5 GHz network. Microwaves emit strong interference on the 2.4 GHz band. Moving the printer to the 5 GHz band avoids that interference. Changing the channel on 2.4 GHz may help but is less effective. Replacing the router or printer is unnecessary.

Answer

Replace the printer with a wired model

Answer

Change the router’s 2.4 GHz channel

Answer

Update the printer firmware

Question 9

A user’s laptop connects to the corporate Wi-Fi but cannot access the internet. Other devices on the same SSID work fine. The technician checks the laptop’s IP configuration and sees an IPv4 address of 169.254.12.34. What is the most likely cause of this issue?

Accepted Answer

The laptop’s DHCP client is disabled or malfunctioning. A 169.254.x.x address is an APIPA address, assigned when a DHCP server is unreachable. This indicates the laptop failed to get an IP from the DHCP server. The wireless connection itself is established, but the laptop cannot obtain proper network configuration. Other devices working suggests the DHCP server is functional, so the issue is likely with this specific laptop’s DHCP client or firewall.

Answer

The laptop is connected to the wrong SSID

Answer

The DHCP server is out of addresses

Answer

The laptop’s wireless adapter is faulty

Question 10

A technician is setting up a wireless network for a small office that experiences heavy interference from neighboring businesses. The office uses many Bluetooth devices and cordless phones. Which 802.11 standard and frequency combination would minimize interference and provide the best performance?

Accepted Answer

802.11ac on 5 GHz. Bluetooth and many cordless phones operate on 2.4 GHz, so moving to 5 GHz (802.11ac or 802.11ax) avoids that crowded spectrum. 802.11ac is the most common high-performance standard for 5 GHz. 802.11n supports both bands but is slower. 802.11ax (Wi-Fi 6) also works on 5 GHz but is newer and more expensive.

Answer

802.11b/g on 2.4 GHz

Answer

802.11n on 2.4 GHz

Answer

802.11ax on 2.4 GHz

Question 11

A technician is deploying a wireless network in a large warehouse with metal shelving. The goal is to provide seamless roaming for handheld scanners. Which technology should the technician implement to ensure clients quickly switch between access points without dropping connections?

Accepted Answer

Enable 802.11r (Fast Roaming) on the access points. Fast roaming (802.11r) enables quick re-authentication when moving between access points, critical for real-time devices. Mesh networks extend coverage but don't guarantee fast roaming. Beamforming improves signal direction but not handoff speed. MIMO increases throughput, not roaming.

Answer

Use a wireless mesh topology

Answer

Configure beamforming on each access point

Answer

Deploy MIMO antennas

Question 12

A technician is troubleshooting a wireless network where users experience intermittent drops during peak hours. The access point is an 802.11n model operating on 2.4 GHz. The technician suspects channel congestion. Which tool should the technician use to identify the least congested channel?

Accepted Answer

Wi-Fi analyzer. A Wi-Fi analyzer (like inSSIDer or a smartphone app) shows channel usage and signal strength from nearby networks, allowing selection of the least congested channel. A spectrum analyzer detects non-Wi-Fi interference but is overkill. A cable tester is for wired networks. A ping test checks connectivity, not channel usage.

Answer

Spectrum analyzer

Answer

Cable tester

Answer

Ping command

Question 13

A technician is configuring a wireless network for a high-density environment such as a conference hall. The network must support hundreds of simultaneous connections with minimal interference. Which configuration will best achieve this?

Accepted Answer

Deploy multiple access points with reduced transmit power and non-overlapping channels. In high-density environments, using multiple access points with low power and careful channel planning reduces co-channel interference and allows more clients. High power on a single AP causes congestion. Disabling 5 GHz or using only 2.4 GHz limits capacity. Enabling WPS is a security risk and does not help density.

Answer

Use a single high-power access point to cover the entire hall

Answer

Disable the 5 GHz band to reduce complexity

Answer

Enable WPS for faster client connections

Question 14

A user complains that their new laptop only sees 2.4 GHz Wi-Fi networks, not the 5 GHz network that was previously visible on their old phone. The router is dual-band and configured to broadcast both bands. What is the most likely reason the laptop cannot see the 5 GHz network?

Accepted Answer

The laptop’s wireless adapter does not support 5 GHz frequencies. 5 GHz networks require compatible hardware. If the laptop’s wireless adapter does not support 5 GHz (e.g., only supports 802.11b/g/n), it will not detect that band. The router is broadcasting both, so channel or SSID mismatch is less likely. Interference is not the cause of complete invisibility.

Answer

The router’s 5 GHz radio is set to a channel not supported by the laptop

Answer

The 5 GHz SSID is hidden

Answer

Interference from microwave ovens is blocking the 5 GHz signal

Question 15

A customer calls to say their new smart TV can see the 2.4 GHz network but not the 5 GHz network, even though the router is dual-band. The technician checks the router settings and confirms both bands are enabled and broadcasting. What is the most likely reason the TV cannot see the 5 GHz network?

Accepted Answer

The TV’s wireless adapter does not support 5 GHz. Many older or budget smart TVs only support 2.4 GHz Wi-Fi. If the TV’s wireless adapter lacks 5 GHz capability, it will never see that network. The router is working correctly, so the issue is device compatibility. Channel or SSID settings are less likely causes.

Answer

The 5 GHz SSID is hidden

Answer

The 5 GHz channel is set to a DFS channel

Answer

The router’s 5 GHz radio is faulty