Which description is correct about the MPLS forwarding mechanism? (Multiple choice)

• A.The system automatically assigns an ID to the upper-layer application that uses the tunnel, also known as Tunnel ID
• B.If the Tunnel ID value is not 0x0, enter the normal IP forwarding process
• C.If the Tunnel ID value is 0x0, enter the MPLS forwarding process
• D.When an IP packet enters the MRLS domain, the FIB table is the first to be checked

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Regarding MP-BGP, whici of the following description is incorrect?

• A.MP-BGP advertises VPNv4 routes through two attributes: MP_REACH_NLRI and MP_UREACH_NLRI
• B.MP-BGP's message type and VPNv4 routing policy are the same as BGP-4
• C.MP-BGP needs to assign private network labels to VPNv4 routes
• D.When the PE and CE exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE

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A router runs OSPF, and the output information is shown in the figure. Which of the following statements is correct?

• A.This device isA, BR
• B.ShouldLSAis of typeAS-external-LSA
• C.ShouldLSAThe described destination network is10.0.23.0/24
• D.in the pictureLSAis generated by this router

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In PLSVPN, in order to distinguish IPv4 prefixes that use the same address space, the value of R0 is added to the IPv4 address. The correct description of the following options is:

• A.RD can be used to control the publication of 1 routing information
• B.After the PE receives the IPv4 route from the CE, it adds RD to the IPv4 route to convert it into a globally unique VPN-IPv4 route, and publishes it on the public network
• C.RD is encapsulated in Update message as BGP extended community attribute during delivery
• D.On a PE device, each VP instance corresponds to a value of 0. On the same PE device, the RD value must be unique.____, ____, ____.

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Which of the following operations is not part of the middle stage of dissection?

• A.Cutover preparation
• B.field defense
• C.business test
• D.cutover implementation

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