Which description is correct about the label encapsulation format in MPLS? (Multiple choice)

• A.The total length of a single MPLS label is 4 bytes (32 bits)
• B.The TTL field in the label is similar to the TTL (Time To Live.) in the IP packet, and it also has the effect of preventing loops.
• C.The S field in the label: 1 bit, used to identify whether the label is the bottom label of the stack, when the value is 1, it indicates the second-to-last label
• D.For Ethernet and PPP packets, the label stack is located between the layer 2 header and the data like a "underlay*": when there is a VLAN tag, the MPLS header is placed between the Ethernet header and the VLAN tag

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Which of the following information can the DHCP binding table contain?

• A.MA, Caddress
• B.lease time
• C.port andUDPport
• D.IPaddress

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Which of the following are documents that need to be handed over as part of the wrap-up of a structured network troubleshooting process files?

• A.Troubleshooting Summary Report
• B.slightly
• C.Maintenance suggestions to avoid this fault
• D.Troubleshooting Procedure Documentation

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Which of the following functions will affect BGP neighbor establishment? (Multiple choice)

• A.BGP route filtering
• B.ebgp max hop
• C.BGP authentication
• D.BGP GSTM

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IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection. R2 only supports IPv4. Which of the following statements is true about the topology calculation of this network?

• A.By default, since R2 does not support IPv6, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is: R1-R3-R4
• B.By default, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is: R1-R2-R4. Since R2 does not support IPv6, R2 will directly discard IPv6 packets after receiving them, causing traffic loss.
• C.By default, IPv4 and IPv6 networks will be calculated separately to form different shortest path trees
• D.If you want IPv4 and IPv6 network computation to form the same shortest path tree, you need to run the ipv6 enable topology ipv6 command to enable the IPv6 capability in the IS-IS process.

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