A network engineer is troubleshooting an OSPF issue in a data center. They notice that the link-state database on Router A contains an LSA that is not present on Router B, even though both routers are in the same OSPF area and have formed full adjacencies. What is the most likely cause of this inconsistency?

Router B is configured with a different OSPF area.

The LSA has not yet been flooded to Router B due to a network issue.

Router A is the DR on the segment, and Router B is a DROTHER.

Router A has a higher router ID than Router B.

What is the primary role of the Designated Router (DR) on an OSPF multi-access network?

To provide a backup path for data traffic if the primary path fails

To act as the central point for LSA flooding and database synchronization, reducing the number of adjacencies required

To forward all data traffic between routers on the segment

To elect the Backup Designated Router (BDR) based on the highest router ID

Two OSPF routers are connected over a point-to-point link. During the adjacency formation process, the routers exchange Database Description (DBD) packets. What is the primary purpose of the DBD packet exchange?

To discover neighbors and establish bidirectional communication.

To acknowledge receipt of Link-State Update (LSU) packets.

To request specific LSAs that are missing from the local database.

To synchronize the link-state databases by exchanging summaries of the LSAs in each router's database.

A network engineer is analyzing the OSPF link-state database on a router. They notice a Type 2 (Network) LSA in the database. What does this LSA describe?

A summary of routes from an area to the backbone area.

A multi-access network and the routers connected to it, generated by the DR.

A router's interfaces and its neighbors on a specific link.

An external route that is redistributed into OSPF.

What condition is required for two OSPF routers to form a full adjacency?

They must have the same OSPF priority

They must be in the same OSPF area and have matching Hello/dead intervals, and they must successfully exchange their link-state databases

They must have the same router ID

They must be connected to the same subnet and have the same OSPF cost

Juniper NetworksCertified Associate, Data Center

Domain 4Objective 1

OSPF Fundamentals JN0-281 Practice Questions (Page 1)

Part of the Data Center Routing Protocols (BGP/OSPF) domain, which makes up ~13% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–8 in this domain), expect 1–2 from this objective — we provide 17 practice questions to prepare you well beyond it. (estimate)

17questions here

4free pages

5concepts

Questions 1–5

1application · medium
A network engineer is troubleshooting an OSPF issue in a data center. They notice that the link-state database on Router A contains an LSA that is not present on Router B, even though both routers are in the same OSPF area and have formed full adjacencies. What is the most likely cause of this inconsistency?
Select an answer first
2foundation · easy
What is the primary role of the Designated Router (DR) on an OSPF multi-access network?
Select an answer first
3application · medium
Two OSPF routers are connected over a point-to-point link. During the adjacency formation process, the routers exchange Database Description (DBD) packets. What is the primary purpose of the DBD packet exchange?
Select an answer first
4application · medium
A network engineer is analyzing the OSPF link-state database on a router. They notice a Type 2 (Network) LSA in the database. What does this LSA describe?
Select an answer first
5foundation · easy
What condition is required for two OSPF routers to form a full adjacency?
Select an answer first

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