單項選擇題A user has no network connectivity. A check of the associated port indicates that the interface is up，the line protocol is down. Which item would most likely cause this problem？（）

A.Speed mismatch
B.Incorrect encapsulation
C.MTU set too low
D.Duplex mismatch


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3.單項選擇題You work as a network engineer for the company，you want to configure two BGP speakers to form an EBGP session across a firewall. On the engineer’s network，the firewall always permits TCP sessions that are initiated from the inside network （the network attached to the inside interface of the firewall）. What prerequisite is there for enabling BGP to run on this network？（）

A.EBGP multihop will need to be configured for this to work.
B.This should work with normal BGP peering，with no additional configuration on the BGP speakers or the firewall.
C.The BGP protocol port must be opened on the firewall
D.There is no way to make BGP work across a firewall.

5.單項選擇題Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label，if the stack bit is set to1，which option is true？（）

A.The stack bit will only be used when LDP is the label distribution protocol
B.The label is the last entry in the label stack.
C.The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.
D.The stack bit is reserved for future use.