As the description of MPLS, which of the following is wrong?

• A.The length of the MPLS label is 20 bits and is used for packet forwarding.
• B.In the TTL processing mode of the Pipe mode, IP packets are transmitted on the MPLS network. The TTL value of the IP packets is reduced by 1 in the MPLS ingress node and the egress node respectively.
• C.The label space range of dynamic signaling protocols such as LDP and MP-BGP is 16-1023.
• D.MPLS supports multi-layer tag nesting, the S-bit value of the innermost tag is 1.

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Which of the following description is correct about the ISIS LSP fragmentation extension?

• A.The fragmentation extension of ISIS is equally valid for the Helio package.
• B.ISIS fragmentation extension is achieved by adding virtual systems, which can be expanded to up to 1000 virtual systems.
• C.Enable the lSIS router to generate more LSP fragments to carry more ISIS information.
• D.The maximum number of fragments that an ISIS router can generate is 1024.

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A newly deployed HW router is configured for Weighted Random Early Discard (WRED) on the HW network.
WRED has which of the following characteristics? (Multiple Choice)

• A.For packets of different priorities, WRED can set different packet drop thresholds and packet loss ratios.
• B.When the minimum threshold is crossed, WRED begins dropping all incoming packets (tail-drop).
• C.Low bandwidth flows are experiencing packet drop at a higher rate than higher bandwidth flows.
• D.Global Synchronization is avoided by selectively dropping packets from multiple TCP flows.

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As shown in the figure, in the hub&spoke multicast mode of MPLS bgp VPN, in order to realize that the branch can only communicate with the headquarters, the branches cannot communicate with each other. Which of the following schemes can the RT be set to?

• A.Headquarters: Import Target : 2:2 Export Target: 3:3 branch 1: Import Target: 3:3 Export Target: 1:1 branch 2: Import Target: 3:3 Export Target: 2:2
• B.Headquarters: Import Target: 12:3 Export Target: 3:12 branch 1: Import Target: 3:12 Export Target: 12:3 branch 2: Import Target: 3:12 Export Target: 12:3
• C.Headquarters: Import Target : 12:3 Export Target: 12:3 branch 1: Import Target: 12:3 Export Target: 12:3 branch 2: Import Target: 12:3 Export Target: 12:3
• D.Headquarters: Import Target : 1:1 Export Target: 3:3 branch 1: Import Target: 3:3 Export Target: 1:1 branch 2: Import Target: 3:3 Export Target: 2:2

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As shown in the following figure, enterprises hope to achieve successful access VPN between headquarters and branches through MPLS.

Branch office VPN traffic must be forwarded through the headquarters for traffic monitoring.
Which of the following statement about this solution is wrong?

• A.You can establish an MP-IBGP peer relationship between the Spoke-PEs and exchange VPN routing information.
• B.When Hub-CE and Hub-PE use EBGP to transmit routing information, the Hub-PE must be able to accept routes that are repeated by the AS number to receive routes advertised by the Hu-CE.
• C.OSPF can be used to exchange routing information between the Hub-CE and the Hub-PE and between the Spoke-PE and the Spoke-CE.
• D.BGP can be used to exchange VPN routing information between the CE and the PE.

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