H12-821_V1.0 Exam Dumps | On an IS-IS network, routers send LSPs to exchange link state information. LSPs are classified into Level-1

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Question 115/140

On an IS-IS network, routers send LSPs to exchange link state information. LSPs are classified into Level-1 LSPs and Level-2 LSPs and have the same format. Which of the following parts constitute the LSP ID in an LSP?

A. LSP Number

B. Pseudonode ID

C. System ID

D. IS Type

Correct Answer: A,B,C

IS-IS Overview: Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol. Routers exchangeLink State Packets (LSPs)to maintain a synchronized link-state database. These LSPs are categorized intoLevel-1 LSPs(intra-area routing) andLevel-2 LSPs(inter-area routing). Both types share the same packet format.
HCIP-Datacom-Core Technology Training Material (IS-IS LSPs and Packet Structure).
LSP ID Format: The LSP ID uniquely identifies each LSP and ensures accurate routing information. It comprises the following components:
System ID (C): A 6-byte identifier assigned to each router, derived from the router's NET (Network Entity Title). This identifier ensures unique identification of routers within the IS-IS domain.
Pseudonode ID (B): Assigned when a router acts as a Designated Intermediate System (DIS) on a broadcast network. It differentiates LSPs generated by the DIS from other routers.
LSP Number (A): A 1-byte field indicating the sequence number of the LSP. It helps distinguish multiple LSPs generated by the same router for the same level.
Reference:HCIP-Datacom Advanced Routing & Switching Technology (IS-IS LSP Format).
IS Type Exclusion:
IS Type (D)is not part of the LSP ID itself. It is a field within the IS-IS PDU that indicates the type of Intermediate System (Level-1, Level-2, or both) but does not contribute to the composition of the LSP ID.
Reference:HCIE-Datacom V1.0 Training Material (IS-IS Basics and Levels).
Conclusion: The LSP ID in IS-IS consists ofSystem ID,Pseudonode ID, andLSP Number. These components uniquely identify each LSP within the IS-IS domain.

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