在一台Cisco路由器上封禁ICMP协议,只允许215.192.40.16/28和202.204.28.2/24子网的ICMP数据包通过路由器,下列正确的access-list配置是( )。

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问题 在一台Cisco路由器上封禁ICMP协议,只允许215.192.40.16/28和202.204.28.2/24子网的ICMP数据包通过路由器,下列正确的access-list配置是(    )。

选项 A、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 (confi
B、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 (c
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 (c
D、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

答案C

解析 对每个选项逐个分析,选项A)错误在于没有采用扩展访问控制列表,选项B)的错误在于规则顺序错误,这会导致无法禁止其他ICMP协议的传输,选项D)错误在于没有采用反掩码。
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