Of the following, which multiple access method for computer networks does 802.11 Wireless Local Area
Network use?

A.
CSMA/CA

B.
CSMA/CD

C.
802.11 does not support multiple access methods

D.
802.11 RTS/CTS Exchange

Explanation:
802.11 Wireless Local Area Network uses CSMA\\CA.
Note: Carrier sense multiple access with collision avoidance (CSMA/CA) is a network multiple access method
in which carrier sensing is used, but nodes attempt to avoid collisions by transmitting only when the channel is
sensed to be “idle”.
Incorrect Answers:
B: While Ethernet uses CSMA/CD, 802.11 Wireless does not. In wireless networks the collision detection of the
alternative CSMA/CD is unreliable due to the hidden node problem.
C: 802.11 uses Carrier sense multiple access (CSMA/CA).
D: Wireless network uses CSMA/CA, not 802.11 RTS/CTS Exchange.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 578