單項(xiàng)選擇題BGP best route selection process is based on what ？（）

A.lowest cost
B.highest bandwidth
C.lowest hop-count
D.path attributes
E.lowest delay


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1.多項(xiàng)選擇題Which two statements are true about RPF checks in MSDP（Multicast Source Discovery Protocol）？（）

A.It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B.RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
C.RPF checking Session Advertisement（SA）messages will cause message looping
D.RPF check should be done against the route to the source S of the corresponding PIM-SM domain

2.單項(xiàng)選擇題The mechanisms for distributing LDP are：（）

A.LDP and RSVP
B.RSVP and CEF
C.CEF and the FIB table
D.UDP and IP
E.A and B

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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.