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-treetopology?（）

A.lowest port MAC address
B.port priority number and MAC address.
C.VTP revision number
D.highest port priority number.
E.pathcost

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单项选择题

A network administrator wants to add a line to an access list that will block only Telnet access by the hosts on subnet 192.168.1.128/28 to the server at 192.168.1.5.What command should be issued to accomplish this task？（）

A.access-list 101 deny tcp192.168.1.1280.0.0.15192.168.1.50.0.0.0eq23 access-list 101 permit ip any any
B.access-list 101 deny tcp192.168.1.1280.0.0.240192.168.1.50.0.0.0eq23 access-list101permit ip any any
C.access-list 1 deny tcp192.168.1.1280.0.0.255192.168.1.50.0.0.0eq21 access-list1permit ip any any
D.access-list 1 deny tcp192.168.1.1280.0.0.15host192.168.1.5eq23 access-list1permit ip any any

单项选择题

一个网络管理员配置了两台交换机London和Madrid，让它们使用VTP。但是，两台交换机之间没有共享VTP信息，根据下图，回答交换机之间没有分享VTP信息的原因是（）。

A.VTP版本配置错误
B.VTP工作模式配置错误
C.VTP域名配置错误
D.VTP的pruning mode被禁止了
E.VTP的V2 mode被禁止了
F.VTPtraps generation被禁止了

单项选择题

Assuming default setting，how can you erase the VTP database of VLANs on a CISCO IOS switch running in VTP server mode？（）

A.Enable VTP pruning
B.From privileged mode，erase the startup configuration file，then reload.
C.From privileged mode，erase the vlan date file，then reload.
D.Cycle the switch power.