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A technician needs to troubleshoot connectivity between two devices located on the same network. Which of the following BEST describes the type of protocol being used?（）
- A、IGP
- B、EIGRP
- C、EGP
- D、BGP
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IGPB
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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
applicationB
hubC
switchD
bridgeE
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IGPB
EIGRPC
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BGP
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Hot addC
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单选题Which routing protocol supports a flexible area structure using routing levels one and two？（）A
OSPFB
EIGRPC
IS-ISD
BGP
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