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.