220-801 Question #811: Real Exam Question with Answer & Explanation

The correct answer is A: 802.11a. IEEE 802.11a is the WLAN standard that operates exclusively in the 5GHz frequency band and supports a maximum data rate of 54Mbps.

Question

Which of the following WLAN protocols is in the 5GHz band with a MAXIMUM data rate of 54Mbps?

Options

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

Explanation

IEEE 802.11a is the WLAN standard that operates exclusively in the 5GHz frequency band and supports a maximum data rate of 54Mbps.

Common mistakes.

B. 802.11b operates in the 2.4GHz band and has a maximum data rate of only 11Mbps using DSSS modulation.
C. 802.11g also operates in the 2.4GHz band and achieves 54Mbps, matching 802.11a in speed but not in frequency band.
D. 802.11n is a dual-band standard supporting both 2.4GHz and 5GHz and achieves a maximum theoretical data rate of up to 600Mbps using MIMO technology.

Concept tested. 802.11a WLAN standard frequency and data rate

Reference. https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/68583-understand-802-11-std.html

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