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


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1.單項選擇題What is true regarding Autonomous Systems （AS ）？（）

A.AS numbers are assigned by the IANA
B.AS numbers are used by BGP （Border Gateway protocol ） to exchange IP routing information with neighboring AS
C.In the internet， an Autonomous System （AS） is a collection of IP networks and routers under the control
D.All of the Above

2.單項選擇題Which command will display the MPLS label binding for IP prefix 1.1.1.0 on the router？（）

A.show tag-switching tdp binding 1.1.1.0/24
B.show tag-switching tdp bindings neighbor 1.1.1.0
C.show tag-switching interface e0/0
D.A and B both will show the binding.
E.All of the above.

3.多項選擇題What are the differences between LLQ and CBWFQ？（）

A.LLQ supports the addition of strict priority queuing
B.With LLQ， bandwidth allocations for the priority queue and all the CBWFQ queues areconfigured using the priority command
C.LLQ is configured using MQC and CBWFQ is configured using the fair-queue command
D.LLQ priority queue bandwidth is policed with a congestion aware policer
E.LLQ does not support WFQ on the default traffic class （class-default）

4.多項選擇題Select the 3 best answers describing operation and configuration of Frame-Relay Inverse ARP.（）

A.Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection on its known DLCI
B.Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server which is used to supply the next-hop protoco address or the DLCI for outgoing traffic
C.Inverse ARP is enabled by default for all protocols enabled on the physical interface
D.Inverse ARP is configured using the following command under the Interface configuration ’frame-relaymap dlci （dlci number） protocol protocol-address’
E.Inverse ARP in Frame-Relay is synonymous of ARP in Ethernet