Question

A wireless engineere has an access point using 5.725-ghz channel in the united states. In which band is the AP operating?

(A) UNII-1
(B) UNII-2
(C) UNII-2 Extended
(D) UNII-3

Answer 1

Option D: UNII-3

Step-by-step explanation:

According to the 802.11 standard, 23 20MHz wide channels are defined in 5 GHz specturm. Each channel is 20MHz apart and they are separated into three Unlicensed National Information Infrastructure (UNII) bands. 802.11a/n/ac wireless devices can operate within these bands. In United States, UNII-3 is the upper UNII band that spans from 5.725 GHz TO 5.825 GHz and therefore it is the band that access point is operating. UNII-3 is not used in Europe countries for wireless communication.