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封禁ICMP协议,只转发212.78.170.166/27所在子网的所有站点的ICMP数据包,正确的access-list 配置是()


  • A.Router (config)#access-list 110 permit icmp 212.78.170.166 0.0.0.0 any Router (config)#access-list 110 deny icmp any any Router (config)#access-list 110 permit ip any any
  • B.Router (config)#access-list 110 permit icmp 212.78.170.0 255.255.255.224 any Router (config)#access-list 110 permit ip any any Router (config)#access-list 110 deny icmp any any
  • C.Router (config)#access-list 110 permit icmp 212.78.170.0 0.0.0.255 any Router (config)#access-list 110 deny icmp any any Router (config)#access-list 110 permit ip any any
  • D.Router (config)#access-list 110 permit icmp 212.78.170.160 0.0.0.31 any? Router (config)#access-list 110 deny icmp any any Router (config)#access-list 110 permit ip any any
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