A service provider is designing a new OSPF area and wants to ensure that all routers in the area have a consistent view of the network topology. What is the primary mechanism that guarantees this consistency?

The Designated Router (DR) maintains the LSDB and distributes it to all other routers.

Each router maintains its own LSDB independently and only shares routes, not LSAs.

All routers in the area maintain an identical LSDB through LSA flooding and synchronization.

The Area Border Router (ABR) periodically sends a full copy of the LSDB to all routers.

A new OSPF router is being added to an existing area 0 with multiple routers. The new router forms an adjacency with a neighbor and enters the ExStart state. What is the purpose of the ExStart state in the LSDB synchronization process?

To negotiate the master/slave relationship and initial Database Description (DBD) sequence number.

To run the SPF algorithm and install routes.

To flood all LSAs to the new router immediately.

To exchange Link-State Request (LSR) packets for missing LSAs.

What is the output of the SPF algorithm in OSPF?

The complete link-state database for the area

The set of all LSAs to be flooded to neighbors

The shortest path tree with the local router as the root

The list of all OSPF neighbors and their states

A network administrator notices that an OSPF LSA in the LSDB has reached its MaxAge (3600 seconds) and has not been refreshed. What is the immediate action the router takes with this LSA?

The router sends a Link-State Request to the originator to refresh the LSA.

The router runs SPF immediately to recalculate routes without the LSA.

The router removes the LSA from its LSDB and floods a new LSA with MaxAge to all neighbors.

The router keeps the LSA in the LSDB but marks it as invalid.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 2Objective 1

Link-State Database JN0-364 Practice Questions (Page 3)

Part of the Open Shortest Path First (OSPF) 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 22 practice questions to prepare you well beyond it. (estimate)

22questions here

5free pages

6concepts

Questions 11–15

11foundation · easy
What is the default maximum age (MaxAge) of an LSA in OSPF?
Select an answer first
12application · easy
A service provider is designing a new OSPF area and wants to ensure that all routers in the area have a consistent view of the network topology. What is the primary mechanism that guarantees this consistency?
Select an answer first
13application · medium
A new OSPF router is being added to an existing area 0 with multiple routers. The new router forms an adjacency with a neighbor and enters the ExStart state. What is the purpose of the ExStart state in the LSDB synchronization process?
Select an answer first
14foundation · easy
What is the output of the SPF algorithm in OSPF?
Select an answer first
15application · medium
A network administrator notices that an OSPF LSA in the LSDB has reached its MaxAge (3600 seconds) and has not been refreshed. What is the immediate action the router takes with this LSA?
Select an answer first

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