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List the differences between CSMA/CD (Carrier Sense Multiple Access / Collision Detection) and CSMA/CA (Carrier Sense Multiple Access / Collision Avoidance) in Computer Networks.

Answer»

Carrier Sense Multiple Access / Collision Detection (CSMA/CD) is a carrier transmission network protocol. It is USED in the medium access control layer (the layer that monitors the hardware which is responsible for the interaction with the wired, optical or wireless transmission medium). It detects if the shared channel for broadcasting is busy and interrupts the broadcast till the channel becomes available. Collisions in CSMA/CD are identified via broadcast SENSING from other STATIONS. In CSMA/CD, when a collision is detected, the transmission is halted and the stations send a jam signal, after which the station waits for a RANDOM time CONTEXT before retransmission.

Carrier Sense Multiple Access / Collision Avoidance (CSMA/CA) is a carrier transmission network protocol. It operates in the same media access control layer as CSMA/CD. Unlike CSMA/CD, which only works after a collision, CSMA/CA works before a collision.

CSMA/CDCSMA/CA
After a collision, CSMA/CD is effective.CSMA / CA is effective before a collision.
CSMA / CD is generally used in wired networks.CSMA / CA is generally used in wireless networks.
CSMA / CD reduces the recovery time only.CSMA/ CA reduces the possibility of a collision.
When a conflict develops, CSMA/CD resends the data frame.The CSMA / CA will convey the intent to send for data transmission first, in case of a collision.


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