Regarding BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?

• A.The egress PE can send IPv4 routes to the remote CE through BGP, IGP or static routing
• B.The ingress PE changes the IPv4 route received from CE to VPNv4 route, and saves it according to different VPN instances
• C.After the egress PE receives the VPNv4 route advertised by the ingress PE, it filters the VPNv4 route according to the RT attribute carried by the route
• D.The exchange between PE and CE is IPv4 routing information

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Which of the following community attributes can ensure that the propagation scope of BGP routing entries is only within the AS?

• A.No_Export_Subconfed
• B.No_Advertise
• C.Internet
• D.No_Export

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Which of the following statements about the MP_REA, CH_NLRI attribute of BGP4+ is correct?

• A.AFI (address family)value is2,representIPv6
• B.The length of the next hop address can be16or3
• C.the length of the next hop address is16Time,Network Address of Next Hopcarries the link-local address
• D.NLRIfield carryIPv6Routing prefix and mask information

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The routing policy tools that can be used by BGP mainly include Filter-policy and Route-policy. Fiter-policy can only filter routes, and Route-policy can only modify routes.

• A.Yes
• B.wrong

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As shown in the figure, MPLS/BGP IPVPN is deployed in the network. The MP-BGP neighbor relationship is established between PE1 and PE2 through the LoopbackD interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 to query neighbor information as shown in the figure. What is the most likely cause of the problem?

• A.The routing protocol configuration between PE1 or PE2 and the respective CE is incorrect
• B.The LSP tunnel between PE1 and PE2 is not established
• C.PE1 and PE2 are not enabled with neighbors in the BGP-VPN4 unicast address family view
• D.The VPN instance parameters on PE1 or PE2 are incorrectly configured

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