JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 66

Which three statements are correct about OSPF packet types? (Choose three.)

Answer options

• A. Link-state request packets are sent after receiving an LSA header not in the OSPF database.
• B. Link-state acknowledgment packets are sent every 30 seconds.
• C. Hello packets are sent every 30 seconds by default.
• D. Link-state update packets contain one or more LSAs.
• E. Database description packets are used during the adjacency formation process.

Correct answer: A, D, E

Explanation

Answer A is correct as link-state request packets are indeed sent when an LSA header is received that isn't in the database. Answer D is also correct since link-state update packets do contain one or more LSAs. Answer E is correct because database description packets are essential in the adjacency formation process. However, answer B is incorrect since link-state acknowledgment packets are not sent at regular intervals like hello packets, which makes answer C misleading as well; hello packets are the ones sent every 10 seconds by default.