An Ethernet cable connects RTA to RTB through Ethernet 0/0.the OSPF neighbor relationship can be established without enabling the OSPF authentication function is enabled, Which of the following statements about the OSPF relationship between RTA and RTB are true?

• A.The OSPF neighbor relationship can be established between RTA and RTB
• B.MD5 authentication is used between RTA and RTB
• C.Simple authentication is used between RTA and RTB
• D.The OSPF neighbor relationship cannot be established between RTA and RTB due to failure of area authentication

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Which statement about primary VPN tunnel binding is false?

• A.Primary VPN tunnel binding means to bind a tunnel to a specific VPN. The bound tunnel is exclusive to
  the VPN.
• B.Primary tunnel ensures that data can be transmitted from a VPN t a specific peer device permanently
  through a dedicate TE tunnel.
• C.The bound primary tunnel can be selected sequentially.
• D.Only the data destined for the specific peer device is transmitted through the n=bound primary VPN
  tunnel Data to other devices is transmitted using the default tunnel policy.

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Which statement about the MPLS LSP Ping is true?

• A.A unique Sender's Handle is generated during each LSP Ping operation
• B.The LSP Ping Echo request must contain the downstream mapping TLV
• C.A uniquesequence number is generated during each LSP Ping operation
• D.The LSP Ping Echo request may contain the FEC stack TLV

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Which statement about the edge access layer is true?

• A.It provides additional value-added services and operation support for established calls
• B.It connects users to the network by providing various access means, and converts the format of information so that the information can be transmitted on the network.
• C.It implements call control. With the softswitch technology as the core, it completes basic realtime call control and connection control.
• D.Using the packet technology, it provides a comprehensive transport platform that boasts high reliability, quality of service (QoS) assurance, and large capacity.

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As shown in the figure, the mapping between links and administrative groups is as follows:
0x0F for A -> B; 0xFF for B -> C; 0xF0 for A -> C; 0xC3 for B -> D; and 0x3C for C -> D.
It is expected to configure a tunnel (affinity: 0x0C; mask: 0xFF) on node A to connect to RTD. Which path will be created along with the tunnel?

• A.A -> B -> D
• B.A -> C -> D
• C.No path will be created.
• D.A -> C -> B -> D
• E.A -> B -> C -> D

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