How does CSMACD react to collisions A All systems jam the ne

How does CSMA/CD react to collisions?

A. All systems jam the network, and then all begin transmitting again.

B. Hosts involved in a collision send an RTS signal indicating a time frame in which to retransmit.

C. Hosts involved in the collision send a jamming signal and then run an algorithm before retransmitting.

D. Collisions do not occur on CSMA/CD.

Solution

A ) Jam signal is the signal which indicates the collision in the network to all other transmitting stations that thy do not send any data frame. And this signal has maximum of 6 bytes (48 bits (512-464)) of time.

If all the stations start sending before they have start carrier has to besensed and if they find carrier is free devices start sending data frames.

But till two data frames are not allowed in CSMA/CD a collision will occur which casuse both the collided devices to send JAM singal to all other devices that a collision was occure and do not send frames.

So all other device goes to \"back off\"(waiting). After some period of time any device can start sensing the medium to get it. Trying to get a medium is a contineous process or upto 16 times failure to get medium.

B ) Retransmit the frame

C ) Retransmit gets delayed and in some times RTC/CTC be ignored start again to sense the medium.

D) Carrier Sense Multiple Aaccess / Collision Detection ( Detection means collisions will occure and this mechanism will detect them.