FUNDAMENTALS OF COMPUTER

TELECOMMUNICATIONS SYSTEMS

COMMUNICATION WIRELESS COMPUTING DEVICES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?

A	CDMA
B	CSMA/CD
C	ALOHA
D	CSMA/CA

Explanation:

Detailed explanation-1: -IEEE 802.11 wireless LANs use a media access control protocol called Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA).

Detailed explanation-2: -IEEE 802.11 uses a modified protocol known as carrier sense multiple access with collision avoidance (CSMA/CA) or distributed coordination function (DCF).

Detailed explanation-3: -CSMA/CD is implemented in 802.11. “All the 802.11 specifications use the Ethernet protocol and Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) for path sharing.”

Detailed explanation-4: -CSMA/CA is Carrier Sense Multiple Access/Collision Avoidance. In this multiple access protocol, the station senses the medium before transmitting the frame. This protocol has been developed to improve the performance of CSMA. CSMA/CA is used in 802.11 based wireless LANs.

Detailed explanation-5: -Carrier sense multiple access with collision avoidance (CSMA/CA) is one of the basic medium access control (MAC) protocols specified in the popular IEEE 802.11 standard. One important feature of CSMA/CA is its use of in-band control frames for dealing with hidden terminals and reducing the cost of potential collisions.

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