Learn the three correct statements about OSPF packet types, including link-state request, link-state update, and database description packets, for the Juniper JN0-351 certification exam.
Table of Contents
Question
Which three statements are correct about OSPF packet types? (Choose three.)
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.
Answer
A. Link-state request packets are sent after receiving an LSA header not in the OSPF database.
D. Link-state update packets contain one or more LSAs.
E. Database description packets are used during the adjacency formation process.
Explanation
The three correct statements about OSPF packet types are:
A. Link-state request packets are sent after receiving an LSA header not in the OSPF database. When an OSPF router receives an LSA header in a database description packet that is not currently in its OSPF database, it sends a link-state request packet to request the full LSA from its neighbor.
D. Link-state update packets contain one or more LSAs. These packets are used to flood LSA information throughout the OSPF area. Each link-state update packet can carry multiple LSAs, allowing for efficient sharing of routing information.
E. Database description packets are used during the adjacency formation process. When two OSPF routers are forming an adjacency, they exchange database description packets to summarize their link-state databases. This allows the routers to determine which LSAs need to be exchanged to synchronize their databases.
The other two statements are incorrect:
B. Link-state acknowledgment packets are not sent every 30 seconds. They are sent immediately upon receipt of link-state update packets to acknowledge receipt of the LSAs.
C. Hello packets are sent every 10 seconds by default on broadcast and point-to-point networks, not every 30 seconds.
Understanding these OSPF packet types and their roles is crucial for managing and troubleshooting OSPF networks, which is an important skill tested on the Juniper JN0-351 certification exam.
Juniper JN0-351 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the Juniper JN0-351 exam and earn Juniper JN0-351 certification.