JNCIS-ENT BGP Practice Question
A network engineer configures an eBGP session on a Junos device and notices that routes learned from the external peer are not being installed in the routing table or advertised to other peers. What is the default behavior regarding eBGP route propagation and next-hop resolution on Junos OS?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The local router does not set the next-hop to itself for eBGP peers, but for iBGP peers the next-hop must be resolvable via an IGP.
By default, eBGP does not change the next-hop address when advertising routes to external peers, but when advertising to iBGP peers, it preserves the next-hop unless 'next-hop-self' is configured. However, for routes to be active, the next-hop must be resolvable in the routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Junos automatically drops all eBGP routes unless an explicit import policy is applied allowing them.
Why it's wrong here
Junos accepts all routes by default in the routing table, though they may not be active without next-hop resolution.
- ✗
eBGP routes require the 'as-override' statement to be active in the forwarding table.
Why it's wrong here
as-override is used in specific provider-edge scenarios to replace the AS number, not for basic route installation.
- ✓
The local router does not set the next-hop to itself for eBGP peers, but for iBGP peers the next-hop must be resolvable via an IGP.
Why this is correct
Correct. When advertising to an eBGP peer, the next-hop is the interface of the advertising router. For iBGP, the next-hop is preserved, requiring IGP resolution.
- ✗
eBGP automatically changes the next-hop to the local router interface for all advertised routes.
Why it's wrong here
For eBGP advertisements, the next-hop is typically kept as the external peer unless modified, whereas it changes to the local router when advertising to eBGP neighbors by default (the next-hop is set to the local router IP for eBGP).
Visual reference
About these practice questions
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIS-ENT practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIS-ENT exam.