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A.you can apply multiple access lists with the same protocol or in different…
B.you can config one access list，per direction，per layer 3 protocol
C.you can place as many access lists as you want on any interface
D.you can apply ony one access list on any interface

A.to confine network instability to single areas of the network
B.to reduce the complexity of router configuration
C.to speed up convergence
D.to lower costs by replacing routers with distribution layer switches
E.to decrease latency by increasing bandwidth
F.to reduce routing overhead