JN0-664 Exam Dumps : Service Provider Professional (JNCIP-SP)

[Reference: Juniper IS-IS DIS Election., Option C (Correct):, On a multi-access network (e.g., Ethernet), all IS-IS routers form adjacencies with every other router on the segment., Unlike OSPF, IS-IS does not restrict adjacencies to only the DIS., The DIS is responsible for creating a pseudonode LSP to represent the broadcast network, but full mesh adjacencies are maintained., Reference: Juniper IS-IS Adjacency Formation., , Why Other Options Are Incorrect:, Option B: Incorrect. Higher priority always wins the DIS election. A priority of 1 cannot override a priority of 10., Option D: Incorrect. IS-IS routers form adjacencies with all neighbors, not just the DIS., , Key Takeaways:, DIS Election: Prioritizes highest numerical value (e.g., 10 > 1)., Adjacency Behavior: Full mesh adjacencies are maintained, unlike OSPF., DIS Role: Primarily for generating pseudonode LSPs and optimizing flooding, not adjacency restriction., For further details, refer to Juniper’s official IS-IS documentation:Juniper IS-IS Configuration Guide., , https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html, ]