CWNA-108 Online Practice Questions and Answers

You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

A. Throughput tester

B. Laptop-based spectrum analyzer

C. Access point spectrum analyzer

D. Wi-Fi scanner

You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned

about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios.

What do you tell him?

A. His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.

B. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.

C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.

D. Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.

In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connects the mesh to an Ethernet network?

A. Mesh Gate

B. Mesh Switch

C. Mesh Router

D. Mesh Portal

The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The users indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both 2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?

A. Use a 160 MHz channel on the 5 GHz radio

B. Use a 40 MHz channel on the 5 GHz radio

C. Install a second AP in the coverage area

D. Use a 40 MHz channel on the 2.4 GHz radio

Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere each other when they transmit frames. Assuming no other Aps are in the vicinity, is CCI still a possibility in this network and why?

A. Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as

B. No, because the Aps are far enough apart that no CCI will occur

C. No, because CCI only occurs in the 5 GHz frequency band

D. Yes, because channel 11 loops around and causes CCI with channel 1

What non-standard WLAN solution attempts to give a longer transmission windows to devices with higher data rates then devise with lower data rates?

A. AirTime Fairness

B. Band Steering

C. ARM

D. RRM

You are configuring an access point to use channel 128. What important fact should be considered about this channel?

A. It is a 22 MHz channel so it will overlap with the channels above and below it

B. It is a 2.4 GHz frequency band 40 MHz channel, so it should not be used

C. It is a channel that is unsupported by most access points

D. It is a channel that likely requires DFS when used

You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your 2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIds, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?

A. Interference from non-Wi-Fi sources

B. Faulty drivers

C. DoS attack

D. Interference from other WLANs

What frame type is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS?

A. RTS

B. ACK

C. Beacon

D. PS-Poll

What security option for 802.11 networks supports SAE and requires protected management frames?

A. WPA

B. WPA2

C. WPA3

D. OWE