JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 19

Which statement is true about an OSPF broadcast link?

Answer options

• A. All routers form an adjacency only with the BDR
• B. All routers form an adjacency only with the DR
• C. All routers form an adjacency with all other routers
• D. All routers form an adjacency with both the DR and BDR

Correct answer: D

Explanation

The correct answer is D because in OSPF broadcast networks, all routers form adjacencies with both the Designated Router (DR) and the Backup Designated Router (BDR) to ensure efficient routing updates. Options A and B are incorrect as they suggest adjacency is formed with only one of these routers, while option C is incorrect because it implies full adjacency with all routers, which is not how OSPF operates in broadcast environments.