On the IP bearer network, media and signaling packets must first be guaranteed by PQ scheduling.
The IP priority of protocol packets on the routers is 6 or 7, and these packets must also first be guaranteed. Other data packets are placed in the BE queue for scheduling. However, devices cannot be connected in inband Telnet mode if network congestion occurs. Which of the following statements are true?

• A.Telnet packets are protocol packets and join high-priority queues by default.
• B.Telnet packets are discarded during network congestion because the IP priority of Telnet packets is 0 and is scheduled in the BE queue.
• C.You can improve the priority of Telnet packets and add them to the PQ queue to ensure them during network congestion.
• D.The UDP port number for Telnet packets is 23.

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With the NAT technology, which of the following elements can be translated?

• A.Session table
• B.Source port number
• C.Destination port number
• D.Source IP
• E.Destination IP

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Which of the following statements about LDP-IGP synchronization are true?

• A.The LDP-IGP synchronization means to postpone the route switchback until LDP completes convergence by suppressing the establishment of IGP neighbor relationships or setting the cost of route advertisement to the largest value.
• B.The LDP and IGP synchronization helps shorten the time for switching traffic from the standby link back to the active link and the switchback can be complete within several milliseconds.
• C.The LDP-IGP synchronization involves three timers: Hold-down, Hold-max-cost, and Syncachieved.
• D.The LDP and IGP synchronization involves four states: Init, Hold-down, Hold-max-cost, and Syncachieved.

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

• A.The control word can be used to identically the packet sequence.
• 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.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
• E.When SVC VLL is used, if PEs at two ends of a VC use different control words, the may not become Up.

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Which of the following statements about the merits of the HoVPN networking are true?

• A.Only local VPN routes need to be maintained on an SPE and remote routes on the SPE are represented by a default route or an aggregate route, reducing the load of the SPE.
• B.If the UPE are SPE are separated by an IP/IPMLS network, they can be connected through a generic routing encapsulation (GRE) or LSP runnel . A hierarchical MPLS VPN provides good scalability.
• C.The BGP/MPLS VPN can be deployed layers by layer. When the performance of a super strum provider edge (SPE) is insufficient, a user-end provider edge (UPE) can be added and the SPE moved to a lower layer. When the access capability of a UPE is insufficient, and SPE can be added.
• D.Packets are forwarded between a UPE and an SPE after being label. The UPE and SPE are connected through an interface (or a subinterface), helping reduce the usage of limited interface resources.
• E.The SPE and UP exchange routes and advertise labels through MP-BGP. Each UPE runs only one - BGP peer, reducing system overheads and simplifying configuration.

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