Which of the following descriptions about the MPLS header TTL are correct? (Multiple choice)

• A.There are two ways that MPLST is handled correctly with TTL. One is to copy the IP TTL value of the TTL of the MPLS header when the IP packet enters the MPLS network; the other is to uniformly set the TTL of the MPLS header to 255 at the ingress LER
• B.The handling of the copied IP TTL value hides the LSR of the MPLS domain
• C.It can prevent infinite loop forwarding of messages
• D.When the TTL is disabled, tracert can see the LSR of the MPLS domain that passes through

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The rollback operation of project cutover can be temporarily determined according to the situation during cutover, and no advance plan is required.

• A.FALSE
• B.TRUE

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The role of Link-LSA in OSPFv3 does not include:

• A.Advertise the link-local address of this interface to other routers on the link
• B.Advertise the IPv6 prefix list of this interface to other routers on the link
• C.Advertise the options set in the Network-LSA originating from this link to other routers on the link
• D.Advertise the router's interface ID to other routers on the link

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The packet filtering firewall provides support for detecting fragmented packets. What are the fragmented packets that the packet filtering firewall can filter? (Multiple choice)

• A.Forged ICMP error message
• B.Non-fragmented packets
• C.The first fragmented packet
• D.Subsequent fragmented packets

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When BGP/MPLS IP VPN is deployed, the OSPF VPN Route Tag is not transmitted in the extended community attribute of MP-BGP, but is only a local concept, only on PE routers that receive MP-BGP routes and generate OSPF LSA Significant.

• A.True
• B.False

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