CWNA: Certified Wireless Network Administrator v107 — Question 9

You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

Answer options

• A. The short guard interval is also enabled.
• B. The clients are all 802.11n STAs or lower
• C. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
• D. All clients implement single spatial stream radios

Correct answer: C

Explanation

The correct answer is C because if the access point is misconfigured to limit the bandwidth to 40 MHz, that would directly result in the observed communication. Options A and D do not directly affect the channel width setting, while B is incorrect as 802.11ac can still operate with 80 MHz if the clients are compatible.