单项选择题

Acknowledgements, sequencing, and flow control are characteristics of which OSI layer（）。

A.Layer2
B.Layer3
C.Layer4
D.Layer5
E.Layer6
F.Layer7

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单项选择题

When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link（）。

A.By default, all defined VLANs are allowed on the trunk.
B.Each single VLAN, or VLAN range, must be specified with the switchport mode command.
C.Each single VLAN, or VLAN range, must be specified with the vtp domain command.
D.Each single VLAN, or VLAN range, must be specified with the vlan database command.

单项选择题

What is one benefit of PVST+?（）

A.PVST+reduces the CPU cycles for all the switches in the network
B.PVST+automatically selects the root bridge location,to provide optimiz…
C.PVST+allow the root switch location to be optimized per vlan.
D.PVST+supports Layer 3 load balancing without loops.

单项选择题

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined（）。

A.It is supplied by the CSU/DSU.
B.It is supplied by the far end router.
C.It is determined by the clock rate command.
D.It is supplied by the Layer 1 bit stream timing.