Little help if possible.

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Could someone, please help me. I need two more web sites that could help me with: The meaning of CSMA/CD, What it does and anything else. Just the web site is all I am asking. I have a definition off of webopedia but it does not go into detail. This is for a major report that I have to have done very soon. I would appreciate all the help anyone can give me. Thank you very much. Again Thank you.