单项选择题
What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）
A.lowest port MAC address B.port priority number and MAC address C.VTP revision number D.highest port priority number E.path cost
单项选择题 In which solution is a router ACL used？（）
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？（）
