单项选择题

以太网交换机根据（）转发数据包。

A.IP地址
B.MAC地址
C.LLC地址
D.PORT地址

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单项选择题

只封禁一台IP地址为203.168.47.59主机的access-list的正确配置是______。

A．access-list 110 permit ip any any
access-list 110 deny ip host 203.168.47.59 any
access-list 110 denyip any host 203.168.47.59
B．access-list 110 deny ip host 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59
access-list 110 permit ip any any
C．access-list 110 denyiphost 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59
D．access-list 110 deny ip host 203.168.47.59 any
access-list 110 permit ip any any
access-list 110 deny ip any host 203.168.47.59

单项选择题

设有下面三条路由：172.30.129.0 24、172.30.130.0 24、172.30.132.0 24，如果进行路由汇聚，能覆盖这三条路由的网络地址是

A) 172.30.128.0/21
B) 172.30.128.0/22
C) 172.30.128.0/22
D) 172.30.128.0/23

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