because in a wireless system, collision detection is not possible and there is no way to do error correction so collision avoidance is the only method
to increase the data rate
to decrease the data rate
to prevent packets from reaching all other nodes
to make sure tat all other nodes hear a collision in progress
CSMA/CD: Carrier Sense Multiple Access / Collision Detection.
The acronym CSMA CD stands for Carrier Sense Multiple Access with Collision Detection. CSMA CD is a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously.
10BaseT
Because CSMA/CD does not prevent Hidden terminal problem. so it is onlly applicable in Wired networks.
*** In CSMA/CD it detects that a collision take place and resend the frame that was send. On a wirless network losing bandwidth along with time to detect that a collision took place was not acceptable , so CSMA/CA was utilized. ** CSMA/CD can achieve above 70% efficiency under heavy loads compared to CSMA/CA that can only achieve up to 30% efficiency under heavy loads. CSMA/CA network: A network in which the medium access control protocol requires carrier sense and where a station always starts transmission by sending a jam signal; if there is no collision with jam signals from other stations, it begins sending data; otherwise, it stops transmission and then tries again later. CSMA/CD network: A bus network in which the medium access control protocol requires carrier sense and in which exception conditions caused by collision are resolved by retransmission
Csma/cd
IP, appletalk, token ring, CSMA/CD, CSMA/CA
Devices listen to the media and transmit data only when they cannot detect another signal on the media. All devices on the media can hear all communications When a collision occurs, all devices stop transmitting for a randomly generated period of time.
Collisions can decrease network performance.
Csma/cd
This is the Algorithm use by CSMA/CD as a wait period to allow other devices on the network to access the media.
Most star topologies use CSMA/CD for a Local Area Network. WANs and MANs are different and use completely different access methods.