to act as an equal-cost path to the primary path
to enable another LSP for load balancing
to act as a diverse backup path to the primary path
to allow the use of explicit path selection via EROs
第1题：
A. The router will use path1 when it is available and stable.
B. The router will use path3 when it is available and stable.
C. The router will attempt to establish path2 only when path1 and path3 are down.
D. The router will attempt to establish path1 only when path2 and path3 are down.
第2题：
A. export PATH=pwd
B. export PATH=$PWD
C. export PATH=$PATH:pwd
D. export PATH=$PATH:$PWD
第3题：
A.path-option
B.route-option
C.explicit-path-option
D.explicit-route-option
第4题：
What is one of the primary overhead fields associated with the Optical Payload Unit （OPU）？（）
第5题：
在MPLS中，LSP的具体解释（）。
第6题：
A. to act as an equal-cost path to the primary path
B. to enable another LSP for load balancing
C. to act as a diverse backup path to the primary path
D. to allow the use of explicit path selection via EROs
第7题：
A.Label Selection Pair
B.Label Switched Path
C.Lighweight Signaling Protocol
D.Large Sampling Path
第8题：
A. a traffic engineered path
B. another name for a Frame Relay PVC
C. a bidirectional path through a network
D. a unidirectional path through a network
第9题：
如何查看PATH变量的值？（）
第10题：
What command will allow the operator to add the current working directory to the command search path?（）