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A.access-list deny-icmp deny icmp any any echo access-group deny-icmp in int outside
B.access-list deny-icmp deny icmp any any echo-reply access-group deny-icmp in int outside
C.在全局模式下直接输入icmp deny any echo-reply outside即可
D.access-list deny-icmp deny ip any int outside access-group deny-icmp in int outside

A.area 2stub nssa
B.area 2stub nssa no-summary
C.area 2nssa
D.nssa area2