單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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.

2.單項(xiàng)選擇題Which of these represents an IPv6 link-local address?（）

A. FE08::280e:611:a:f14f:3d69
B. FE81::280f:512b:e14f:3d69
C. FE80::380e:611a:e14f:3d69
D. FEFE:0345:5f1b::e14d:3d69

4.單項(xiàng)選擇題Which IPV6 routing protocol uses multicast group FF02::9 to send updates?（）

A. RIPng
B. OSPFv3
C. static
D. IS-IS for IPv6

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