JNCIS-SP Practice Questions - Juniper Networks Certified Internet Specialist, Service Provider (JNCIS-SP) Exam

In IS-IS, what is the primary distinction between a Level 1 (L1) router and a Level 2 (L2) router?

L1 routers route within an area; L2 routers route between areas and form the IS-IS backbone L1 routers use OSPF-compatible LSAs; L2 routers use NLPID-tagged PDUs L1 routers only advertise IPv6 prefixes; L2 routers only advertise IPv4 prefixes L1 routers require manual neighbor discovery; L2 routers use automatic adjacency

Correct Answer:

L1 routers route within an area; L2 routers route between areas and form the IS-IS backbone

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