220-801 Question #382: Real Exam Question with Answer & Explanation

The correct answer is A: 802.11a. 802.11a operates exclusively in the 5 GHz frequency band, offering up to 54 Mbps but with shorter range and less wall penetration than 2.4 GHz. 802.11b and 802.11g operate only in the 2.4 GHz band. 802.11n is a dual-band standard that can operate in both 2.4 GHz and 5 GHz bands.

Question

Which of the following wireless protocols is limited to operating in the 5 GHz range ONLY?

Options

A802.11a
B802.11b
C802.11g
D802.11n

Explanation

802.11a operates exclusively in the 5 GHz frequency band, offering up to 54 Mbps but with shorter range and less wall penetration than 2.4 GHz. 802.11b and 802.11g operate only in the 2.4 GHz band. 802.11n is a dual-band standard that can operate in both 2.4 GHz and 5 GHz bands. The 5 GHz-only limitation of 802.11a means it is incompatible with 2.4 GHz-only devices without a dual-band access point.

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