CWNA-109 · Question #120
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
The correct answer is B. 400 ns. The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the…
Question
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
Options
- A800 ns
- B400 ns
- C104 ms
- D10 ms
How the community answered
(32 responses)- A3% (1)
- B88% (28)
- C6% (2)
- D3% (1)
Explanation
The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the receiver. The short guard interval is only used when both the AP and the client support it and agree to use it.
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