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单选题
Layer 3 （the network layer） provides connectivity and path selection between two host systems that may be located on geographically separated networks. Which two devices operate at the network layer？（）
A
application
B
hub
C
switch
D
bridge
E
router
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单选题At which layer of the OSI model is the optimal path to a network destination determined at?（）A
Data LinkB
SessionC
PhysicalD
PresentationE
NetworkF
Transport
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单选题You are the Cisco Network Designer in Cisco.com. In your company site， a NAS is both physicall yand logically in the traffic path. The NAS identifies clients solely based on their MAC addresses. Inwhich access mode has this NAS been configured to operate？（）A
Layer 2 modeB
Layer 2 Edge modeC
Layer 3 modeD
Layer 3 In-Band mode
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单选题At a certain customer’s site， a NAS is both physically and logically in the traffic path. The NAS identifies clients solely based on their MAC addresses. In which access mode has this NAS been configured to operate？（）A
Layer 2 modeB
Layer 3 Edge modeC
Layer 3 Central modeD
Layer 3 In-Band mode
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单选题At a certain customer’s site， a NAS is logically in the traffic path but not physically in the trafficpath. The NAS identifies clients by their IP addresses. In which access mode has this NAS beenconfigured to operate？（）A
Layer 2 Edge modeB
Layer 2 Central modeC
Layer 2 In-Band modeD
Layer 3 mode
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多选题Which two of these are characteristics of MPLS VPNs？ （）ALayer 3 MPLS VPNs can forward only IP packetsBLayer 2 MPLS VPNs can forward any network protocolCMPL S label paths are automatically formed based on Layer 2 framesDLayer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesEIn Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policies
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单选题Which statement about data center access layer design modes is correct？（）A
The access layer is the first oversubscription point in a data center design.B
When using a Layer 2 loop-free design， VLANs are extended into the aggregation layer.C
When using a Layer 2 looped design， VLANs are not extended into the aggregation layer.D
When using a Layer 3 design， stateful services requiring Layer 2 connectivity are provisionedfrom the aggregation layer.E
The data center access layer provides the physical-level connections to the server resourcesand only operates at Layer 3.
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