在一台Cisco路由器的g0/1端口上，用标准访问控制列表禁止源地址为10.0.0.0-10.255.255.255和172.16.0.0-172.31.255.255的数据包进出路由器。下列access-list配置，正确的是（）
- A.Router (config)#access-list 30 deny 10.0.0.0 0.255.255.255 log Router (config)#access-list 30 deny 172.16.0.0 0.15.255.255 Router (config)#access-list 30 permit any Router (config)#interface g0/1 Router (config-if)#ip access-group 30 in Router (config-if)#ip access-group 30 out
- B.Router (config)#access-list 30 deny 10.0.0.0 255.255.255.0 log Router (config)#access-list 30 deny 172.16.0.0 255.240.0.0 Router (config)#access-list 30 permit any Router (config)#interface g0/1 Router (config-if)#ip access-group 30 in Router (config-if)#ip access-group 30 out
- C.Router (config)#access-list 100 deny 10.0.0.0 0.255.255.255 log Router (config)#access-list 100 deny 172.16.0.0 0.15.255.255 Router (config)#access-list 100 permit any Router (config)#interface g0/1 Router (config-if)#ip access-group 100 in Router (config-if)#ip access-group 100 out
- D.Router (config)#interface g0/1 Router (config-if)#ip access-group 99 in Router (config-if)#ip access-group 99 out Router (config-if)#exit Router (config)#access-list 99 deny 10.0.0.0 0.255.255.255 log Router (config)#access-list 99 deny 172.16.0.0 0.15.255.255 Router (config)#access-list 99 permit any
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参考答案：A
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