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CCDA Notes : cont....

36. FragmentFree switching, as the name indicates, looks for any bus activity before forwarding a frame for any possible collisions. This collision in Ethernet happens during the first 64 bytes. Therefore, the switch waits for 64 bytes time before forwarding a frame.

37. Capacity and delays:

-         At 70% utilization, a WAN link is considered running at full capacity.

-         At 40% utilization, an Ethernet link is considered running at full capacity.

-         At 80% utilization, a Token Ring network is considered running at full capacity.

-         100ms or less should be the response time when a network is considered working satisfactorily.

-         The allowable delay for Class II repeater is only 92 bit times. The allowable delay for a class I repeater is 140 bit times.