單項(xiàng)選擇題A network is composed of several VRFs. It is required that VRF users VRF_A and VRF_B be able  to route to and from VRF_C， which hosts shared services. However， traffic must not be allowed to flow between VRF_A and VRF_B. How can this be accomplished？（）

A.route redistribution
B.import and export using route descriptors
C.import and export using route targets
D.Cisco MPLS Traffic Engineering


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2.單項(xiàng)選擇題panning Tree Protocol calculates path cost based on which of these？（）

A.interface bandwidth
B.interface delay
C.interface bandwidth and delay
D.hop count
E.bridge priority

3.單項(xiàng)選擇題An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each， terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs， and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue. What action will likely fix this problem？（）

A.mark VOIP traffic with IP precedence 6 and configure only ’fair-queue’ on the links
B.configure the scheduler allocate 3000 1000 command to allow the QoS code to have enough CPU cycles
C.enable class-based traffic shaping on the VoIP traffic class
D.enable Layer 2 fragmentation and interleaving on the links
E.enable Frame Relay on the links and send voice and data on different Frame Relay PVCs

4.多項(xiàng)選擇題Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree  Protocol IEEE 802.1D？ （）

A.Designated Root Cost
B.bridge ID priority
C.max age
D.bridge ID MAC address
E.Designated Root Priority
F.forward delay

5.單項(xiàng)選擇題To troubleshoot network issues more accurately， milliseconds should be included in the syslog of the router. Which command will achieve this？（）

A.service timestamps log datetimec msec
B.logging timestamps msec
C.syslog timestamps hour minute second miliseconds
D.service logging timestamp msec
E.logging service timestamp msec

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