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CSMA/CD

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by andrew_granados

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Explain why the delivery time of an Ethernet frame is not bounded. Why CSMA/CD protocol cannot be used in wireless LANs and CSMA/CA is used instead.

3 replies

by rindi1

This sounds like an exam question, I'm sure you can find the necessary info yourself!

by ckavinda

To the guy, who made the previous comment about this question being an exam question. -
"Man.. Don't try to be a big d***, if you don't wanna answer the question. We are here to help each other, not to judge."

Here's the answer..

CSMA/CD specifies that a node should listen to the medium before starting a transmission and during the transmission. But wireless antennas lose the ability to receive signals during transmission. That's one of the reasons you can't use CSMS/CD with wireless network. And the other problem is called the hidden terminal problem. As an example, two nodes, Node X and Y are within the range of the receiver Z, but not within each others' range. These node cannot detect transmissions from each other, which can lead to a collision. That's another reason why CSMS/CD cannot be used with wireless LANs.

by nirandi

i had the same question. i thought may be its because with CSMA/CD in wireless the network will seem collided all the time hence it will withhold transmitting.

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