单项选择题

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（）。

A.Router rconfig)#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)#
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(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 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)#

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单项选择题

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 10.0.0.0 255.0.0.0 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
B.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(conng)#access-list 30 permit any
Router(config)#interface g0/1
Router(config-it)#ip access-group 30 in
Router(config-it)#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-it)#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