220-1201 Practice Test 40 — 15 Questions

Question 1

A customer wants to set up a home network that supports the fastest possible speeds for streaming 4K video and gaming, with support for multiple devices. They have a cable modem that supports up to 1 Gbps. Which wireless standard should you recommend for the new router?

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

Accepted Answer

802.11ax (Wi-Fi 6). 802.11ax (Wi-Fi 6) is the correct recommendation because it offers the highest theoretical data rates (up to 9.6 Gbps aggregate), improved efficiency in dense environments via OFDMA and MU-MIMO, and lower latency, all of which are critical for streaming 4K video and gaming on multiple devices. It also provides backward compatibility with older Wi-Fi standards while maximizing throughput over the existing 1 Gbps cable modem connection.

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802.11ac (Wi-Fi 5)

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802.11n (Wi-Fi 4)

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802.11g (Wi-Fi 3)

Question 2

A technician is troubleshooting a wireless network where users report intermittent connectivity and slow speeds. A spectrum analyzer shows high noise levels on the 2.4 GHz band from non-Wi-Fi sources. Which of the following is the MOST effective long-term solution?

Accepted Answer

Move all critical devices to the 5 GHz band.. The 5 GHz band has significantly more non-overlapping channels and is far less congested by non-Wi-Fi interference (e.g., microwaves, Bluetooth, cordless phones) than the 2.4 GHz band. Moving critical devices to 5 GHz avoids the interference source entirely, providing a stable long-term solution without compromising throughput or reliability.

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Reduce the 2.4 GHz channel width to 20 MHz.

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Implement DFS channels on the 5 GHz band.

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Increase the transmit power on the 2.4 GHz radio.

Question 3

A technician is configuring a network for a university campus that has multiple buildings spread across a 5-kilometer area. Each building has its own LAN, and they all need to be interconnected to share resources. Which network type best describes the overall campus network?

Accepted Answer

Campus area network (CAN). A campus area network (CAN) is specifically designed to interconnect multiple LANs within a limited geographic area, such as a university campus or corporate park. With buildings spread across 5 kilometers, the network fits the CAN scope, which typically spans up to 10 km and uses high-speed backbone links like Gigabit Ethernet or fiber optics to connect the individual LANs.

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Local area network (LAN)

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Metropolitan area network (MAN)

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Wide area network (WAN)

Question 4

During a site survey, a technician needs to measure the signal strength of a wireless access point from various locations in an office to ensure adequate coverage. Which tool should be used for this task?

Accepted Answer

Wi-Fi analyzer. A Wi-Fi analyzer is the correct tool because it is specifically designed to measure wireless signal strength (RSSI), channel utilization, and interference from access points. During a site survey, the technician uses a Wi-Fi analyzer to collect real-time signal data from various locations, ensuring adequate coverage and identifying dead zones or co-channel interference.

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Multimeter

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Spectrum analyzer

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Cable tester

Question 5

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. 802.11ac operates exclusively on the 5 GHz frequency band, which is far less congested than 2.4 GHz. This avoids interference from Bluetooth devices and cordless phones (which predominantly use 2.4 GHz), providing cleaner channels and better performance in a dense interference environment.

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802.11b/g on 2.4 GHz

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802.11n on 2.4 GHz

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802.11ax on 2.4 GHz

Question 6

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 a high-density environment like a conference hall, deploying multiple access points with reduced transmit power and non-overlapping channels (e.g., 1, 6, 11 for 2.4 GHz) minimizes co-channel interference and allows efficient frequency reuse, supporting hundreds of simultaneous connections. This design increases overall capacity by creating smaller, manageable cells that reduce contention and improve throughput per client.

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

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Disable the 5 GHz band to reduce complexity

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Enable WPS for faster client connections

Question 7

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. The 169.254.x.x address is an Automatic Private IP Addressing (APIPA) address, assigned by Windows when the DHCP client fails to obtain a lease from a DHCP server. Since other devices on the same SSID work fine, the DHCP server is functional and has available addresses, isolating the issue to the laptop's DHCP client service being disabled or malfunctioning, which prevents it from requesting or renewing an IP address.

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The laptop is connected to the wrong SSID

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The DHCP server is out of addresses

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The laptop’s wireless adapter is faulty

Question 8

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. The most common reason a device sees only the 2.4 GHz band is that its wireless adapter lacks 5 GHz support. Many older or budget smart TVs ship with single-band 2.4 GHz Wi-Fi chipsets, so even though the router broadcasts both bands, the TV’s hardware cannot detect or connect to the 5 GHz network.

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The 5 GHz SSID is hidden

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The 5 GHz channel is set to a DFS channel

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The router’s 5 GHz radio is faulty

Question 9

A small office has a single internet connection and needs to allow multiple internal devices to share that connection. The router's public IP is assigned by the ISP. Which network service must be enabled on the router to allow internal devices to communicate with external servers?

Accepted Answer

NAT. NAT (Network Address Translation) is required because it allows multiple internal devices with private IP addresses to share a single public IP address assigned by the ISP. When internal devices send traffic to external servers, NAT translates the private source IP and port to the router's public IP and a unique port, enabling responses to return to the correct internal host. Without NAT, the router would drop packets from private addresses destined for the internet, as they are not routable on the public internet.

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DHCP

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DNS

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PAT

Question 10

A technician is troubleshooting a network where users can access the internet but cannot reach a specific internal web server by its hostname. The server's IP is 10.0.0.5, and pinging 10.0.0.5 works. The technician checks the DNS server and finds an A record for the server's name pointing to 10.0.0.10. What is the most likely issue?

Accepted Answer

The DNS A record is incorrect. The DNS A record maps the server's hostname to 10.0.0.10, but the server's actual IP is 10.0.0.5. Since pinging the IP works, the network path to the server is functional; the failure to reach it by hostname is due to DNS resolving to the wrong address. This is a classic DNS misconfiguration where the A record does not match the server's assigned IP.

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The DHCP server assigned the wrong IP to the server

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The router's port forwarding is misconfigured

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The server's firewall is blocking DNS queries

Question 11

A technician needs to configure a router to allow internal users to access a web server on the internet using a public IP address. The web server is hosted internally on a private IP. Which network service must be configured on the router?

Accepted Answer

NAT. C is correct because Network Address Translation (NAT) translates the private IP address of the internal web server to a public IP address, allowing internal users to reach it over the internet. Without NAT, the router would drop packets with private source addresses destined for the internet, as private IPs are not routable on the public internet per RFC 1918.

Answer

DNS

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DHCP

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RADIUS

Question 12

A small office has a single router with four LAN ports. The network uses 192.168.1.0/24. A new printer is assigned a static IP of 192.168.1.256. What will happen when the printer is connected?

Accepted Answer

The printer will not be able to communicate on the network. 192.168.1.256 is an invalid IPv4 address. In IPv4, each octet is an 8-bit number ranging from 0 to 255. The value 256 exceeds this limit, so the address is malformed. The printer will not be able to communicate on the network because its configured IP is outside the valid address space and cannot be used for any network communication.

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The printer will work but only with devices that have a static IP

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The printer will automatically obtain a valid IP via DHCP

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The printer will cause an IP address conflict with the router

Question 13

A user reports that their desktop computer cannot connect to the internet, but other devices on the same network work fine. You check the patch cable from the wall jack to the PC and find it is a Cat5e cable. The PC's network adapter shows a link light, but no activity. What should you do first?

Accepted Answer

Check the IP address configuration on the PC to see if it has a valid address.. The link light indicates Layer 1 (physical) connectivity is present, so the cable and switch port are likely functional. The lack of activity suggests the PC is not successfully communicating at Layer 3, often due to an incorrect or missing IP address. Checking the IP configuration (e.g., with `ipconfig` or `ifconfig`) is the logical first step to verify if the PC has a valid address from DHCP or is set to an APIPA range (169.254.x.x), which would prevent internet access.

Answer

Replace the Cat5e cable with a Cat6 cable.

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Reboot the switch in the wiring closet.

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Replace the network adapter in the PC.

Question 14

A customer reports that their laptop can connect to the internet at home via Wi-Fi, but at a coffee shop it cannot connect to the guest network. They have not changed any settings. Which network type is most likely causing this issue?

Accepted Answer

Local Area Network (LAN). (LAN) is correct because the coffee shop's guest network is a Local Area Network (LAN) that the laptop must join via Wi-Fi. Since the laptop works at home but not at the coffee shop, the issue is likely with the LAN configuration—such as a mismatched SSID, security type (e.g., WPA2 vs. WPA3), or IP address assignment (DHCP) on that specific LAN. The user's unchanged settings may not be compatible with the coffee shop's LAN setup.

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Personal Area Network (PAN)

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Wide Area Network (WAN)

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Metropolitan Area Network (MAN)

Question 15

A technician is setting up a wireless network for a home office that requires the fastest possible speeds for streaming 4K video. The router supports 802.11ac and has three antennas. Which configuration will yield the highest throughput?

Accepted Answer

Use the 5 GHz band with MIMO enabled and a channel width of 80 MHz.. 802.11ac operates exclusively on the 5 GHz band, and combining MIMO (multiple-input multiple-output) with an 80 MHz channel width maximizes throughput by increasing spatial streams and spectral bandwidth. This configuration supports the high data rates required for 4K video streaming, typically exceeding 1 Gbps aggregate throughput.

Answer

Set the router to 802.11n mode only.

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Enable 40 MHz channel width on the 2.4 GHz band.

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Disable SSID broadcast to reduce overhead.