H12-821_V1.0 Exam Dumps | On a P2P IS-IS network, after a neighbor relationship is established between R1 and R2, R2 finds that

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Question 41/140

On a P2P IS-IS network, after a neighbor relationship is established between R1 and R2, R2 finds that its LSDB is not synchronized. Then, R2 requests corresponding LSPs from R1 for LSDB synchronization. The following figure shows the synchronization process. Drag the following packet types to the steps in which they are used.(Token is reusable)

Correct Answer:

Explanation of IS-IS Packet Types and Synchronization Process:
In the given scenario, R2 requests LSPs from R1 to synchronize its Link State Database (LSDB). The following IS-IS packet types are involved in this synchronization process:
1. P2P IIH (Point-to-Point IS-IS Hello):
* Purpose: Establishes and maintains IS-IS neighbor relationships.
* Step: This packet is exchanged initially to detect and maintain the adjacency between R1 and R2.
2. PSNP (Partial Sequence Number PDU):
* Purpose: Requests missing or outdated LSPs (Link State PDUs) from a neighbor to synchronize the LSDB.
* Step: In this case, R2 sends a PSNP to R1 to request the missing or outdated LSP.
3. LSP (Link State PDU):
* Purpose: Contains routing information and is used to update the LSDB.
* Step: R1 sends the requested LSPs to R2 for synchronization.
4. CSNP (Complete Sequence Number PDU):
* Purpose: Lists all LSPs in the sender's LSDB to help neighbors verify and request missing LSPs.
* Step: R1 sends a CSNP during retransmission timeout to notify R2 of its LSPs.

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