在一台Cisco路由器上封禁ICMP协议，只允许215.192.40.16/28和202.204.28.0/24子网的ICMP数据包通过路由器，下列正确的access-list配置是（）
- A.Router (config)#access-list 100 permit icmp 215.192.40.16 255.255.255.240 any Router (config)#access-list 100 permit icmp 202.204.28.0 255.255.255.0 any Router (config)#access-list 100 deny icmp any any Router (config)#access-list 100 permit ip any any Router (config)#
- B.Router (config)#access-list 98 permit icmp 215.192.40.16 0.0.0.15 any Router (config)#access-list 98 permit icmp 202.204.28.0 0.0.0.255 any Router (config)#access-list 98 deny icmp any any Router (config)#access-list 98 permit ip any any Router (config)#
- C.Router (config)#access-list 198 permit icmp 215.192.40.16 0.0.0.15 any Router (config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router (config)#access-list 198 deny icmp any any Router (config)#access-list 198 permit ip any any Router (config)#
- D.Router (config)#access-list 198 permit icmp 215.192.40.16 0.0.0.15 any Router (config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router (config)#access-list 198 permit ip any any Router (config)#access-list 198 deny icmp any any Router (config)#
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参考答案：C
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