在一台Cisco路由器上,只允许IP地址为212.78.4.100/24的主机和202.34.76.64/26子网上的所有主机远程登录路由器,下列正确的access-list配置是

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问题 在一台Cisco路由器上,只允许IP地址为212.78.4.100/24的主机和202.34.76.64/26子网上的所有主机远程登录路由器,下列正确的access-list配置是

选项 A、Router(config) # access-list 30 permit 202.34.76.64 0.0.0.63
   Router(config) # access-list 30 permit 212.78.4.100
   Router(config) # access-list 30 deny any
   Router(config) # line vty 0 5
   Router(config) # access-class 30 in
B、Router(config) # access-list 30 permit 202.34.76.64 0.0.0.192
   Router(config) # access-list 30 permit 212.78.4.100
   Router(config) # access-list 30 deny any
   Router(config) # line vty 0 5
   Router(config) # access-class 30 in
C、Router(config) # access-list 30 deny any
   Router(config) # access-list 30 permit 202.34.76.64 0.0.0.63
   Router(config) # access-list 30 permit 212.78.4.100
   Router(config) # line vty 0 5
   Router(config) # access-class 30 in
D、Router(config) # access-list 30 permit 202.34.76.64 255.255.255.192
   Router(config) # access-list 30 permit 212.78.4.100
   Router(config) # access-list 30 deny any
   Router(config) # line vty 0 5
   Router(config) # access-class 30 in

答案A

解析
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