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Which is the protocol used in ethernet. (CSMA/CD) Why is it
called so ?
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Answer Posted / vijaysivadas
CSMA/CD -Its called the carrier Sense Multiple
Access /Collision Detection
Each interface must wait until there is no signal on the
channel, then it can begin transmitting. If some other
interface is transmitting there will be a signal on the
channel, which is called carrier. All other interfaces must
wait until carrier ceases before trying to transmit, and
this process is called Carrier Sense.
All Ethernet interfaces are equal in their ability to send
frames onto the network. No one gets a higher priority than
anyone else, This is what is meant by Multiple Access.
Since signals take a finite time to travel from one end of
an Ethernet system to the other, the first bits of a
transmitted frame do not reach all parts of the network
simultaneously. Therefore, it's possible for two interfaces
to sense that the network is idle and to start transmitting
their frames simultaneously. When this happens, the
Ethernet system has a way to sense the "collision" of
signals and to stop the transmission and resend the frames.
This is called Collision Detect.
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