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

Question

Question

This question was previously asked in

NIELIT Scientific Assistant CS 5 Dec 2021 Official Paper

Answer 1

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The correct answer is CSMA/CA.

key-point-image Key Points

CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance.
It is a network multiple access method used in IEEE 802.11 wireless network standards.
CSMA/CA helps prevent collisions by using a technique where each device listens to the channel before transmitting data.
If the channel is clear, the device sends a signal indicating its intent to transmit, then waits for an acknowledgment before actually sending the data.
This method reduces the chances of collision and improves the reliability of data transmission in wireless networks.

additional-information-image Additional Information

CSMA/CA is different from CSMA/CD (Carrier Sense Multiple Access with Collision Detection), which is used in wired Ethernet networks.
In CSMA/CD, devices detect collisions after they occur and take steps to resolve them, while CSMA/CA aims to avoid collisions before they happen.
IEEE 802.11 includes several amendments such as 802.11a, 802.11b, 802.11g, etc., all of which use CSMA/CA as the multiple access technique.
Other multiple access techniques like CDMA (Code Division Multiple Access) and ALOHA are used in different networking standards and have different mechanisms for handling multiple access.