An IS-IS router has been generating LSPs with a sequence number of 0x00000001 for the past hour. The network administrator notices that the LSPs are being refreshed every 15 minutes. What is the most likely explanation for the sequence number not changing?

The router is malfunctioning and failing to increment the sequence number, which will cause other routers to ignore the LSP.

The router is re-flooding the same LSP with the same sequence number because the LSP content has not changed, and the refresh process resets the lifetime without incrementing the sequence number.

The router is using a sequence number that is too low, and other routers are rejecting the LSP, so the router keeps re-sending it.

The router is sending the LSP only to the designated router, which is responsible for incrementing the sequence number and re-flooding it.

Why does an IS-IS router periodically refresh its own LSPs?

To reduce the size of the link-state database by removing old TLVs

To increase the sequence number so the LSP is considered newer by neighbors

To advertise new neighbors that have been discovered since the last refresh

To prevent the LSP from expiring and to ensure the database remains consistent

How does an IS-IS router handle a newly received LSP during flooding?

It sends the LSP only to the designated intermediate system (DIS) on broadcast networks

It immediately discards the LSP if it is not directly connected to the originator

It sends an acknowledgment to the originator and does not forward the LSP

It stores the LSP in its database and forwards it to all neighbors except the one it received it from

What happens to an IS-IS LSP when its lifetime expires?

The LSP is automatically refreshed by the originating router with a new sequence number

The LSP is kept in the database but ignored by the SPF algorithm

The LSP is resent to all neighbors with the same sequence number

The LSP is removed from the link-state database and flooded as expired to all neighbors

Which statement correctly describes the role of the link-state database in IS-IS routing?

It is the central repository of topology information used to calculate the shortest path tree

It is used to store the complete list of IP routes learned from all routing protocols

It is a list of all routers that have sent a complete sequence number PDU (CSNP)

It is a temporary cache of recently received hello packets

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 6Objective 1

Link-State Database JN0-352 Practice Questions (Page 1)

Part of the IS-IS domain, which makes up ~15% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–9 in this domain), expect 1–1 from this objective — we provide 17 practice questions to prepare you well beyond it. (estimate)

17questions here

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6concepts

Questions 1–5

1application · medium
An IS-IS router has been generating LSPs with a sequence number of 0x00000001 for the past hour. The network administrator notices that the LSPs are being refreshed every 15 minutes. What is the most likely explanation for the sequence number not changing?
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2foundation · easy
Why does an IS-IS router periodically refresh its own LSPs?
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3foundation · easy
How does an IS-IS router handle a newly received LSP during flooding?
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4foundation · easy
What happens to an IS-IS LSP when its lifetime expires?
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5foundation · easy
Which statement correctly describes the role of the link-state database in IS-IS routing?
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