多項選擇題Which four statements about the Carrier Supporting Carrier （CSC） feature are true？ （）

A.MPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier.
B.The backbone carrier must enable the PE router to check that the packets it receives from the CErouter contain only the labels that the PE router advertised to the CE router.
C.Every packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labels
D.AII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite.
E.Arouting protocol is required between the PE and CE routers that connect the backbone carrierto thecustomer carrier. The routing protocol enables the customer carrier to exchange IGP routing information with the backbone carrier.


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1.單項選擇題What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations？（）

A.immediately after receiving the first packet on the shared tree for a given （S，G）
B.after receiving over 1 kb/s traffic onthe shared tree for a given （S，G）
C.10 seconds after receiving the first packet on the shared tree for a given （S，G）
D.30 seconds after receiving the first packet on the shared tree for a given （S，G）
E.after receiving over 10 kb/s traffic onthe shared tree for a given （S，G）

2.單項選擇題What is the data encapsulation method for the VPLS virtual circuit （VC）？（）

A.MAC over MPLS
B.L2TPV3
C.802.1 QinQ
D.Ethernet over MPLS
E.GRE

3.多項選擇題What three major tasks are performed by a Designated Intermediate System in an ISIS pseudonodeenvironment？（）

A.Updating the pseudonode LSP
B.maintaining pseudonode link-state information
C.creating the pseudonode
D.flooding LSPs over the LAN
E.election of the pseudonode

4.單項選擇題What does RPL stand for？（）

A.routing primary language
B.routing policy language
C.routing police language
D.routing program language
E.routing protocol language

5.多項選擇題Which three components are included in the Cisco IOS XR infrastructure？（）

A.modular line cards
B.shelf controllers
C.route processors
D.service processors
E.distributed service cards