network cisco ccna gns3 certification arteq

network cisco ccna gns3 certification arteq
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Wednesday, February 22, 2012

cam again...

the cam table is the mac table spelled backwards... actually the cam (content addressable memory) and mac address table are the same... i spent quite some time trying to find if there was indeed some subtle difference between the two; and i have found there is no difference... the tcam table is the ternary content addressable memory table... for this i will paste from wikipedia;

Binary CAM is the simplest type of CAM which uses data search words consisting entirely of 1s and 0s. Ternary CAM (TCAM) allows a third matching state of "X" or "Don't Care" for one or more bits in the stored dataword, thus adding flexibility to the search. For example, a ternary CAM might have a stored word of "10XX0" which will match any of the four search words "10000", "10010", "10100", or "10110". The added search flexibility comes at an additional cost over binary CAM as the internal memory cell must now encode three possible states instead of the two of binary CAM. This additional state is typically implemented by adding a mask bit ("care" or "don't care" bit) to every memory cell.

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