單項選擇題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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1.單項選擇題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

2.多項選擇題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

3.單項選擇題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

4.多項選擇題Assume two routers on the same subnet， R1 and R2， both configured for HSRP. R1 has a priority of 120.Which of the following HSRP interface configurations will always result in the R2 becoming the primary？（）

A.standby 1 priority 110
B.standby 1 priority 120
C.standby 1 priority 130
D.standby 1 priority 110 preempt
E.standby 1 priority 120 preempt
F.standby 1 priority 130 preempt

5.多項選擇題If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）

A.A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
B.A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
C.A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
D.A SHAM link is part of OSPF network of MPLS-VPN provider