Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 18

Graceful Restart is supported by what IGPs?

Answer options

• A. RIPv1 and RIPv2
• B. OSPF
• C. IS-IS
• D. BGP

Correct answer: B, C

Explanation

The correct answers are B (OSPF) and C (IS-IS) because both protocols have mechanisms that allow them to maintain their state during a restart, ensuring continuity in routing. RIPv1 and RIPv2 do not have support for Graceful Restart, and while BGP supports it, it is classified as an Exterior Gateway Protocol, not an IGP.