单项选择题

Using more than one label on a single packet is required in what context？（）

A.MPLS TE
B.MPLS VPN
C.When CEF switching and Label switching is done
D.In all the above circumstances

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单项选择题

Which of the following processes are likely to be found in a microkernel？（）

A.Lightweight messaging
B.Memory management
C.Hardware abstraction
D.Host stack
E.Process scheduling
F.All of the above

多项选择题

What are BCP 38 （Best Common Practices 38）/RFC 2827 Ingress Packet Filtering Principles？（）

A.Filter Smurf ICMP packets.
B.Filter as close to the core as possible
C.Filter as close to the edge as possible
D.Filter as precisely as possible
E.Filter both source and destination where possible

单项选择题

If two routers， both reachable from one another， originate functionally equivalent type 2 external- LSAs （i.e，same destination， cost and non-zero forwarding address ）， Which of the following statements wouldapply ？（）

A.Two LSAs will exist in the network for this destination， and both will be used
B.Two LSAs will exist in the network for this destination， but only the one generated by the highest RID ASBR will be used
C.Only the LSA generated by the highest RID ASBR will exist in the network
D.Only the LSA generated by the lowest RID ASBR will exist in the network