单项选择题

Which of the following IOS features can prevent IP spoofing attacks？（）

A.PPP over Ethernet
B.Cisco Express forwarding
C.MPLS traffic Engineering
D.IS-IS routing
E.Unicast Reverse Path Forwarding（uRPF）

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多项选择题

MPLS label headers for packet media consist of（）.

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

单项选择题

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

单项选择题

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