多項選擇題MPLS label headers for packet media consist of（）.

A.Version
B.Label
C.COS/EXP
D.TTL
E.S flag


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1.單項選擇題In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）

A.It adds the VPN label into the top label in the MPLS label stack
B.It replaces the top label in the MPLS label stack with a VPN label and propagates
C.It replaces the bottom label in the MPLS label stack with a VPN label and propagates
D.It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
E.None of above

2.單項選擇題GMPLS is based upon：（）

A.Packet-based switching devices
B.VPI/VCI-based switching devices
C.Non-Packet-based devices
D.None of the above
E.A and B

3.單項選擇題In the context of MPLS Traffic engineering， TE path calculation is conducted by（）.

A.TE middle point
B.TE tail end
C.TE head end
D.All TE nodes along the path
E.Independent server

4.單項選擇題What is the default SPF throuttle timer in OSPF？（）

A.0ms
B.10ms
C.500ms
D.1s
E.5s
F.30s

5.多項選擇題Which three choices are BGP Extended communities used in MPLS-VPN deployment？（）

A.Site Of Origin SOO
B.Route-Target
C.Route-Distinguisher
D.Domain Identifier BGP extended commumity