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?
A. All clients implement single spatial stream radios
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. The short guard interval is also enabled
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Correct answer is B, 802.11n can only reach a maximum of 40 Mhz channel width.
Check Cisco’s Whitepaper on WiFi 5, aka, 802.11ac, bullet point 1 mentions the advantage of 802.11ac is that it increases the maximum channel width of 40 Mhz in 802.11n to 80 Mhz on 802.11ac
https://www.cisco.com/c/dam/en/us/products/collateral/wireless/aironet-3600-series/white-paper-c11-713103.pdf
BSS IS For AP.
only 40 MHz because AP config is Wrong.
Answer is c
No, BSS includes APs and STAs (clients).