在一台Cisco路由器上用show access—list命令得到下列信息 Extended IP access list fengi in 1434 deny udp any any eq 1434 deny top any any eq 4444

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问题 在一台Cisco路由器上用show access—list命令得到下列信息
Extended IP access list fengi in 1434
deny udp any any eq 1434
deny top any any eq 4444
permit ip any any
根据以上信息,下列路由器的access—list配置,正确的是(    )。

选项 A、Router(config)#ip access—list standard fengjinl434
Router(config—std—nae])#deny udp any any eq 1434
Router(config—std—nae])#deny top any any eq 4444
Router(eonfig—std—nael)#permit ip any any
Router(config—std—nae])#exit
Router(config)#interface g0/1
Router(config—if)#ip access—group fengjinl434 in
Router(config—if)#ip access—group fengjinl434 out
Router(config—if)#
B、    Router(config)#interface g0/1
    Router(config—if)#ip access—group fengjinl434 in
    Router(config—if)#ip access—group fengjinl434 out
    Router(config)#ip access—list standard fengjin 1434
    Router(config—ext—nacl)#deny udp any any eq 1434
    Router(config—ext—nacl)#deny tcp any any eq 4444
    Router(config—ext—nacl)#permit ip any any
    Router(config—ext—nacl)#exit
    Router(config—if)#
C、    Router(config)#ip access—list extended fengjinl434
    Router(config—ext—nacl)#deny udp any any eq 1434
    Router(config—ext—nacl)#deny tcp any any eq 4444
    Router(config—ext—nacl)#permit ip any any
    Router(config—ext—nacl)#exit
    Router(config)#interface g0/1
    Router(config—if)#ip access—group fengjinl434 in
    Router(config—if)#ip access—group fengjinl434 out
    Router(config—if)#
D、   Router(config)#ip access—list extended fengjinl434
    Router(config—ext—nacl)#permit ip any any
    Router(config—ext—nacl)#deny udp any any eq 1434
    Router(config—ext—nacl)#deny top any any eq 4444
    Router(config—ext—nacl)#exit
    Router(config)#interface g0/1
    Router(config—if)#ip access—group fengjinl434 in
    Router(config—-if)#ip access—-group fengjinl434 out
    Router(config—if)#

答案C

解析 A、B选项采用标准的访问控制列表(standard),可以排除;排除某个协议或者端口时,配置语句应该先拒绝排除的协议或者端口,然后允许其它协议或者端口进行数据传输,D选项是先允许后拒绝,D选项错误。故选择C选项。
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