Prerequisite – Carrier Sense Multiple Access (CSMA)
CSMA/CD stands for Carrier Sense Multiple Access / Collision Detection is a network protocol for carrier transmission. It is operated in the medium access control layer. It senses of the shared channel is busy for broadcasting and interrupts the broadcast until the channel is free. In CSMA/CD collision is detected by broadcast sensing from the other stations. Upon collision detection in CSMA/CD, the transmission is stopped and a jam signal is sent by the stations and then the station waits for a random time context before retransmission.
CSMA/CA stands for Carrier Sense Multiple Access / Collision Avoidance is a network protocol for carrier transmission. Like CSMA/CD it is also operated in the medium access control layer. Unlike CSMA/CD(that is effective after a collision) CSMA / CA is effective before a collision.
Let’s see the difference between CSMA/CA and CSMA/CD:-
|1.||CSMA / CD is effective after a collision.||Whereas CSMA / CA is effective before a collision.|
|2.||CSMA / CD is used in wired networks.||Whereas CSMA / CA is commonly used in wireless networks.|
|3.||It only reduces the recovery time.||Whereas CSMA/ CA minimizes the possibility of collision.|
|4.||CSMA / CD resends the data frame whenever a conflict occurs.||Whereas CSMA / CA will first transmit the intent to send for data transmission.|
|5.||CSMA / CD is used in 802.3 standard.||While CSMA / CA is used in 802.11 standard.|
|6.||It is more efficient than simple CSMA(Carrier Sense Multiple Access).||While it is similar to simple CSMA(Carrier Sense Multiple Access).|
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