You are reconfiguring an AP to use the short guard interval for 802.11ac. How long will the new guard interval duration be after the change?
You are reconfiguring an AP to use the short guard interval for 802.11ac. How long will the new guard interval duration be after the change?
When reconfiguring an AP to use the short guard interval for 802.11ac, the new guard interval duration will be 400 nanoseconds (ns). The standard 802.11ac supports two guard interval durations: a short guard interval of 400 ns and a long guard interval of 800 ns. Using the short guard interval can improve throughput performance by reducing the time wait between symbols.
The HT PHY introduced two guard intervals: 400ns (called short) and 800ns (called long). Support of the 400ns SGI (Short Guard Interval) is optional for transmit and receive. LGI (Long Guard Interval) would be 800ns so the answer is 'B'. CWNA-108 pg 289