A campus deployed both IPv4 and IPv6 networks for service testing, and ran IS-S to interconnect the networks. (The S-S routing protocol has good scalability and is widely used in the live network.) Regarding IS-IS extensibility, which of the following statements is true?

• A.IS-IS uses the TLV structure to build messages, making lS-IS more flexible and extensible
• B.NLPID is a new type of TLV added by IS-IS to support IPv6
• C.In order to support IPv6, IS-IS needs to add TLV to carry IPv6 address information
• D.For IS-IS, adding new features simply adds a new TLV to

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Which of the following descriptions of MPLS header TTL are correct?

• A.MPLS has two ways of handling TTL, one is that the IP packet copies the PTTL of the MPLS header hen it enters the MPLS network Value; Another is to set the TTL of the MPLS header to 255 at the entrance LER
• B.Copy IPTIL value is handled in such a way that the LSR of the MPLS domain is hidden, which plays a certain security role
• C.When copying TTL is disabled, tracert can see the LSR of the passing MPLS domain
• D.Can prevent wireless circular forwarding of messages

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What mechanisms or techniques can VRRP combine with to monitor uplink connectivity?

• A.Interface trace
• B.NQA
• C.IP-link
• D.BFD

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An engineer performed the ingestion operation on an OSPF router in a network of the company, is the following statement about the introduction of the routing LSA correct?

• A.Using the Link State ID and Advertising Router, you can uniquely identify an LSA
• B.The Advertising Router report is set to as the Router ID of ASBR
• C.Net Mask is set to all 0
• D.Link State lD is set as the destination network segment address

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In cross-domain VPN-OptionB packet forwarding, two ASBRs exchange the same LSP tags once.

• A.False
• B.True

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