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【单选题】
路由器 MSR-1 的 GE0/0 接口地址为 192.168.100.1/24,该接口连接了一台三层交换机,而此三层交换机为客户办公网络的多个网段的默认网关所在。MSR-1 通过串口 S1/0 连接到 Internet。全网已经正常互通, 办公网用户可以访问 Internet。出于安全性考虑,需要禁止客户主机 ping MSR-1 的 GE0/0 接口,于是在该路由器上配置了如下 ACL: acl advance 3008 rule 0 deny icmp source 192.168.1.0 0.0.0.255 同时该 ACL 被应用在 GE0/0 的 inbound 方向。发现局域网内 192.168.0.0/24 网段的用户依然可以 ping 通 GE0/0 接口地址。根据如上信息可以推测_______。A.
该 ACL 没有生效
B.
该 ACL 应用的方向错误
C.
防火墙默认规则是允许
D.
对接口 GE0/0 执行 shutdown 和 undo shutdown 命令后,才会实现 192.168.0.0/24 网段 ping 不通 MSR-1 以太网接口地址
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