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.

Explanation:
Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a
protocol that helps devices share the bandwidth evenly without having two devices transmit at the
same time on the network medium. CSMA/CD was created to overcome the problem of those
collisions that occur when packets are transmitted simultaneously from different nodes. And trust
me, good collision management is crucial, because when a node transmits in a CSMA/CD
network, all the other nodes on the network receive and examine that transmission. Only bridges
and routers can effectively prevent a transmission from propagating throughout the entire network!
So, how does the CSMA/CD protocol work? Like this: when a host wants to transmit over the
network, it first checks for the presence of a digital signal on the wire. If all is clear (no other host is
transmitting), the host will then proceed with its transmission. But it doesn’t stop there. The
transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If
the host detects another signal on the wire, it sends out an extended jam signal that causes all
nodes on the segment to stop sending data (think, busy signal). The nodes respond to that jam
signal by waiting a while before attempting to transmit again. Backoff algorithms determine when
the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes
attempting to transmit will then time out.