单选题 定义一个用于封禁ICMP协议而只允许转发166.129.130.0/24子网的ICMP数据包的访问控制列表,Cisco路由器的正确配置是
  A) access-list 198 permit icmp 166.129.130.0 255.255.255.0 any
  access-list 198 deny icmp any any
  access-list 198 permit ip any any
  B) access-list 198 permit icmp 166.129.130.0 0.0.0.255 any
  access-list 198 deny icmp any any
  access-list 198 permit ip any any
  C) access-list 99 permit icmp 166.129.130:0 0.0.0.255 any
  access-list 99 deny icnip any any
  access-list 99 permit ip any any
  D) access-list 100 permit icmp 166.129.130.0 0.0.0.255 any
  access-list 100 permit ip any any
  access-list 100 deny icmp any any


【正确答案】 B
【答案解析】