Do Switches need to use CSMA/CD

Mr.Noe

I thought that only hubs need CSMA/CD, why would a switch need it anyway. I was buying stuff online and this caught my attention http://www.newegg.com/Product/Product.asp?Item=N82E16817201207

It was pretty cheap for a 16 port switch, so what's the catch?

johndoed0e

CSMA/CD is a half-duplex protocol.
The switch supports it, in case you decide to attach a device that does not operate in a full-duplex mode. Such as a hub.

thisisalex02

Switches create a seperate collision domain for each port, hence eliminating the possibility of collisions.

Ten9t6

thisisalex02 wrote:

Switches create a seperate collision domain for each port, hence eliminating the possibility of collisions.

Until a user plugs a hub into that port. and they will...

To the original question if you buy an Ethernet switch, yes, it will use CSMA/CD.......

If you don't want it, you can always buy a token ring switch..

Kenny

Yankee

johndoe had the right answer. If the switch port is half duplex then collision detection is enabled.

Yankee