單項選擇題What is the label for MPLS over ATM？（）

A.VPI 16
B.DLCI
C.VPI and VCI
D.circuit number
E.PVC and SVC


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1.單項選擇題When will the primary processor core dump run in case of a switchover？（）

A.never takes place
B.periodically
C.during switchover
D.after switchover
E.before switchover

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

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

3.單項選擇題Which statement about VPNv6 addresses is true？（）

A.The VPNv6 address is a 96-bit route distinguisher and a 128-brt IPv6 address
B.The VPNv6 address is a 64-bit route distinguisher and a 128-bit IPv6 address
C.The VPNv6 address is a 64-brt route distinguisher and a 96-brt IPv6 address
D.The VPMv6 address is a 96-brt route distinguisher and a 96-bit IPv6 address
E.The VPNv6 address is a 128-bit route distinguisher and a 128-brt IPv6 address

4.多項選擇題Which are three advantages of PPPoA implementation？ （）

A.NAP and NSP provide secure access to corporate gateways without managing end-to-end PVCs.NAP and NSP use Layer 3 routing，Layer 2 Forwarding，or Layer 2 Tunneling Protocol tunnels.Hence，they can scale their business models for selling wholesale service
B.The NSP can oversubscribe by deploying idle and session timeouts using an industry standard RADIUS server for each subscriber
C.Only a single session per CPE on one virtual channel （VC).The username and password are configured on the CPE， so all users behind the CPE for that particular VC can access only one set ofservices. Users cannot select different sets of services， although using multiple VCs and establishing different PPP session on different VCs is possible
D.If a single IP address is provided to the CPE， and NAT or PAT is implemented，certain applications such as IPTV，which embed IP information in the payload， well not work. Additionally，if an IP subnet feature is used，an IP address also has to be reserved for the CPE
E.PPPoA can use the features on the Cisco Service Selection Gateway （SSG）

5.單項選擇題Which of these is not a component of MPLS traffic engineering？（）

A.trunk admission control
B.forwarding traffic to tunnel
C.information distribution
D.path selection， calculation， and setup
E.traffic patterns prediction