Which two statements describe the operation of the CSMA/CD access method? (Choose two.)
A.
In a CSMA/CD collision domain, multiple stations can successfully transmit data
simultaneously.
B.
In a CSMA/CD collision domain, stations must wait until the media is not in use before
transmitting.
C.
The use of hubs to enlarge the size of collision domains is one way to improve the operation of
the CSMA/CD access method.
D.
After a collision, the station that detected the collision has first priority to resend the lost data.
E.
After a collision, all stations run a random backoff algorithm. When the backoff delay period has
expired, all stations have equal priority to transmit data.
F.
After a collision, all stations involved run an identical backoff algorithm and then synchronize
with each other prior to transmitting data.
Carrier Sense Multiple Access / Collision Detection, a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously (called a collision). Standard Ethernet networks use CSMA/CD to physically monitor the traffic on the line at participating stations.
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Must wait – random backoff
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CSMA/CD procedure to initiate a transmission:
Is my frame ready for transmission? If yes, it goes on to the next point.
Is medium idle? If not, wait until it becomes ready
Start transmitting and monitor for collision during transmission
Did a collision occur? If so, go to collision detected procedure.
Reset retransmission counters and end frame transmission.
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