单项选择题

The show ip ospf database external command displays information about which OSPF LSA type？（）

A.LSA type 1
B.LSA type 2
C.LSA type 7
D.LSA type 3
E.LSA type 9
F.LSA type 5

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单项选择题

What is the encapsulation mode for MPLS running on Ethernet？（）

A.Packet mode
B.Frame mode
C.Transparent mode
D.Channel mode
E.Tunnel mode

单项选择题

What is the action of "pop" in the context of MPLS switching？（）

A.It removes the top label in the MPLS label stack.
B.It adds a top label in MPLS label stack.
C.It replaces the top label in the MPLS label stack with another value.
D.It replaces the top label in the MPLS label stack with a set of labels.
E.None of above.

单项选择题

In which of the following lists of APS Action Requests is the priority correctly arranged from lowest tohighest？（）

A.Wait-to-Restore，Forced Switch，Manual Switch，Lockout of Protection
B.Manual Switch，Wait-to-Restore，Lockout of Protection，Forced Switch
C.Lockout of Protection，Forced Switch， Manual Switch，Wait-to-Restore
D.Lockout of Protection，Manual Switch， Forced Switch，Wait-to-Restore
E.Wait-to-Restore，Manual Switch，Forced Switch，Lockout of Protection
F.Wait-to-Restore，Manual Switch，Lockout of Protection，Forced Switch