Which statement about 802.11h is true?

Which statement about 802.11h is true?
A . DFS feature works irrespective of whether the channel setting on WLC is set to auto or manual.
B . 802.11h is not a mandatory standard under FCC regulations.
C . The FCC does not require 802.11h to be supported in the 5 GHz band.
D . When the radio detects a radar, it can use the channel for only 20 minutes at a time.

View Answer

Answer: A

Explanation:

From: IEEE 802.11h-2003 -Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/IEEE_802.11h-2003

The standard provides Dynamic Frequency Selection (DFS) andTransmit Power Control (TPC) to the802.11aPHY. It has been integrated into the fullIEEE 802.11-2007standard.

FCC Regulations Update -Cisco http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1300­series/prod_white_paper0900aecd801c4a88.html

In order to operate in the 5 GHZ bands radios must comply with two features that are part of the 802.11h specification-Dynamic Frequency Selection (DFS) and Transmitter Power Control (TPC).

TPC and DFS: Overview | Other Wireless -Mobility Subjects | Cisco Support Community https:// supportforums.cisco.com/document/52376/tpc-and-dfs-overview