单项选择题
In which solution is a router ACL used？（）
A.protecting a server frome unauthorized acces B.controlling path selection，based on the route metric C.reducing router CPU utilization D.filterring packets that are passing through a router
单项选择题 Assuming default setting，how can you erase the VTP data base of VLANs on a CISCO IOS switch running in VTP server mode？（）
单项选择题 一个默认的帧中继WAN被分类为哪种物理网络类型？（）
单项选择题 What is the function of the command switchport trunk native vlan 999 on a？（）
