單項(xiàng)選擇題How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates？（）

A.Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the sub-interface
B.Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic
C.Configure many sub-interfaces on the same subnet
D.Configure a single sub-interface to establish multiple PVC connections to multiple remote router interfaces


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2.單項(xiàng)選擇題Acknowledgements, sequencing, and flow control are characteristics of which OSI layer（）。

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

3.單項(xiàng)選擇題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.

4.單項(xiàng)選擇題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.

5.單項(xiàng)選擇題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.

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