CWNA 802.11 Standards & Protocol Architecture

Question 1

Which 802.11 amendment introduced OFDM (Orthogonal Frequency Division Multiplexing) to the 5 GHz band?

Accepted Answer

802.11a

Answer

802.11a was the first amendment to use OFDM in the 5 GHz UNII bands, supporting data rates up to 54 Mbps.

Question 2

What is the maximum number of non-overlapping channels in the 2.4 GHz band in the United States?

Accepted Answer

3

Answer

In the US 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping, providing just 3 interference-free channels.

Question 3

Which 802.11 frame type is responsible for managing associations and authentications between clients and access points?

Accepted Answer

Management frames

Answer

Management frames handle network operations such as association, authentication, probing, and beacon advertisements.

Question 4

What mechanism does 802.11 use to avoid collisions in the shared wireless medium?

Accepted Answer

CSMA/CA

Answer

802.11 uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) because collisions cannot be detected on wireless links as they are on Ethernet.

Question 5

What is the purpose of the RTS/CTS mechanism in 802.11?

Accepted Answer

Mitigate the hidden node problem

Answer

RTS/CTS (Request to Send / Clear to Send) reserves the wireless medium before data transmission, solving the hidden node problem.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA 802.11 Standards & Protocol Architecture