JNCIP-ENT: Juniper Networks Certified Professional – Enterprise Routing (2024) — Question 52

When using wide metrics, which two statements about route advertisement between IS-IS levels are correct? (Choose two.)

Answer options

• A. Level 1 and Level 2 routers do not advertise Level 2 routes into the Level 1 area by default.
• B. Level 1 routes are advertised to Level 2 routers by default.
• C. If wide-metrics-only is configured, Level 1 routes are not advertised to Level 2 routers by default.
• D. Level 1 routes advertised as external routes into Level 1 are not advertised to any Level 2 routers by default.

Correct answer: A, D

Explanation

Option A is correct because Level 1 routers do not advertise Level 2 routes into the Level 1 area unless specifically configured to do so. Option D is also correct as external routes from Level 1 are not sent to Level 2 routers by default. Options B and C are incorrect; Level 1 routes are not advertised to Level 2 routers by default, regardless of wide-metrics-only configuration.