A PW is found Down after VPLS is configured on an NE series router. What are possible causes?

• A.The MTUs configured on the local and peer PEs are different.
• B.The AC encapsulation types configured on the local and peer PEs are different.
• C.Some AC links in the VSI to which the PW belongs are Down.
• D.The local PE learns MAC addresses in Unqualified mode, whereas the peer PE learns MAC addresses in Qualified mode.
• E.The PEs at both ends of a PW tunnel are not configured with the tunnel type specified in the tunnel policy

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1.Onthe backbone network , if a PE is connect to a CE, VPN instances need to breconfiguredon the PE, and
interface on the PE for connecting to the CE must be bound to a VPN instance. After binding an interface to a
VPN instance, you must configure the IP address of the interface between PEs, IS-IS configured for PE
interworking. PLSA basic capabilities and MPLS LSP are configured for LSP establishment, and MP _IBGP
is configured for VPN route exchange VPN routesexchange , LDAP is short for Label Distribution Protocol,
and IBGP is short for interior Border gateway protocol.
2. A CE exchange route exchange routers with a PE over External Border gateway Protocol (EBGP.
Configure interior gateway protocol (IGP) on the IS-IS+MPLS backbone networking toachievethe
interworking between PEs and IP routers.

• A.-1
• B.-3
• C.-2
• D.-5
• E.-4

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Which of the following statements about control words in the L2VPN are true?

• A.When SVC VLL is used, if PEs at two ends of a VC use different control words, the may not become Up.
• B.The control word can be used for packet padding For example, when the public network uses Ethernet and the AC uses Peer-to-protocol (PPP), control words can be used to transfer and identify PPP packet with a bytes.
• C.A control word generally has two bytes and can ne extended to four bytes.
• D.The control word can be used to identically the packet sequence.
• E.When Martini VLL is used, if PEs at two ends of a virtual connection (VC) use different control words, the VC may not become Up

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Refer to the exhibit.

OSPF process 1 is started on RTA and assigned to the vpn1 instance.
After the vpn-instance-capability simple command is configured in the OSPF view, which of the following statements are false?

• A.Bit B is not set in the router LSA generated by RTA in area 1.
• B.After RTA imports a BGP route from the MPLS VPN backbone network, if Domain ID of the BGP route is the same as that used in the local OSPF area and the BGP route is an intra-area route, a Type 3 summary LSA is generated and flooded to area 1.
• C.When RTA imports a BGP route from OSPF process 1, an extended community identification must be carried to specify the OSPF attributes of the route.
• D.When RTA receives a Type 3 summary LSA with the DN bit in area 1, it ignores the calculation of the LSA.

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Which of the following operations will make a PE send notifications to its peer in PWE3?

• A.Disable MPLS
• B.Shut down a public network tunnel
• C.Shut down an AC interface
• D.Delete the L2VPN services from an interface

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