Cisco路由器执行show access—list的命令显示如下一组信息 Standard IP access list block deny 10.0.0.0.wildcard bits 0.255.255.255 log de

admin2020-01-14  48

问题 Cisco路由器执行show access—list的命令显示如下一组信息
    Standard IP access list block
    deny 10.0.0.0.wildcard bits 0.255.255.255 log
    deny 172.16.0.0.wildcard bits 0.15.255.255
    permit any
根据上述信息,正确的access—list配置是(    )。

选项 A、Rounter(conng)#access—list standard block
    Rounter(config—std—nacl)#deny 1 0.0.0.0 255.0.0.0 log
    Rounter(config—std—nacl)#deny 1 72.1 6.0.0 255.240.0.0
    Rounter(config—std—nacl)#permit any   
B、Rounter(config)#IP access—list standard block
    Rounter(config—std—nacl)#permit any
    Rounter(config—std—nacl)#deny 10.0.0.0 0.255.255.255 log
    Rounter(config—std—nacl)#deny 172.16.0.0 0.15.255.255
C、Rounter(config)#IP access—list standard block
    Rounter(config—std—nacl)#deny 10.0.0.0 255.0.0.0 log
    Rounter(config—std—nacl)#deny 172.16.0.0 255.240.0.0
    Rounter(config—std—nacl)#permit any
D、Rounter(config)#access—list standard block
    Rounter(config—std—nacl)#deny 10.0.0.0 0.255.255.255 log
    Rounter(config—std—nacl)#deny 172.16.0.0 0.15.255.255
    Rounter(config—std—nacl)#permit any

答案D

解析 在扩展或标准访问控制模式下,配置过滤准则的命令为:permit|deny protocolsource wildcard—mask destination wildcard.mask[operator][operand]。因为wildcard.mask是子网掩码的反码,所以可以判断。
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