A.CoPP protects against IP spoofing；Racl protects against DoS attacks.
B.CoPP can not use named access lists；Racl can use named access lists
C.CoPP applies to a dedicated control plane interface；Racl applies to all interfaces.
D.CoPP needs a AAA server，Racl does not need a AAA server
E.CoPP supports rate limits；Racl does not support rate limits
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