Regarding the MPLS handling mode of TTL, the following description is correct?

• A.Pipe mode. When an IP message passes through an MPLS network, the IPTTL minus l at the entry point is mapped to the MPLS TTL field
• B.MPLS tags in the TTL, which mean the same as the TTL domain in the IP header. TTL prevents mpLS networks from creating routing loops
• C.In Unifor mode, when an IP message passes through an MPLS network, the inbound IPTTL is minus 1.
  The MPLSTTL field is a fixed value
• D.In MMLSVPI, if you need to hide the structure of the MPLS backbone network, you can use the Uniform mode on Ingress for private network messages

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Regarding the LDP protocol session establishment process, the description is correct?

• A.The party with the larger transmission address initiates the establishment of a TCP connection as the active party
• B.After the TCP connection is successfully established, the active party sends an initialization message to negotiate the relevant parameters of the LDP session,
• C.Hello messages discovered by LDP neighbors use TCP messages with a destination address of multicast address 224002
• D.When both parties receive a keepalive message from the peer, the LDP session is successfully established

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The following description of MP-BGP is incorrect?( Single choice questions).

• A.MP-BGP can be used to assign tags.
• B.A complete MP_REACH_NLRI attribute structure contains address family, next hop, and prefix information.
• C.The MP_UNREACH_NLRl of the update message, excluding the path nationality.
• D.MP_REACH_NLRI and MP_UNREACIH_NLRI are optional transition properties.

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A campus deploys OSPF to achieve network interoperability, and an engineer configures R2 as shown in the figure, then the following description of the LSA in the OSPF network is wrong

• A.There is no Type3 LSA flooding in Area2
• B.Area2 contains Type5 LSA generic adverb
• C.There is no Type3 LsA flooding within Areal
• D.There is Type5 LSA flooding within Areal

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Which of the following VPN technologies may have two IP message headers in one message?

• A.L2TP
• B.GOES
• C.SSL VPN
• D.IPsec VPN

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