JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2024) — Question 40

Which statement is correct about IS-IS link state PDUs?

Answer options

• A. They are used to maintain link-state database synchronization.
• B. They are used to establish adjacencies.
• C. They are used to build the link-state database.
• D. They are used to determine whether the neighbors are Level 1 or Level 2.

Correct answer: C

Explanation

The correct answer is C because IS-IS link state PDUs are specifically used to build the link-state database, which is essential for routing. Option A is incorrect as synchronization is a broader process, while B refers to establishing adjacencies, which is not the primary function of PDUs. Option D is also wrong because determining neighbor levels is not the main purpose of the PDUs.