JNCIS-ENT BGP Practice Question
Which TWO statements correctly differentiate eBGP from iBGP? (Choose two.)
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
✓
eBGP routers prepend their own AS number to the AS_PATH attribute when advertising routes.
eBGP sessions are typically established between routers in different autonomous systems and have a default TTL of 1, whereas iBGP sessions are between routers in the same AS and have a default TTL of 255.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
iBGP routes have a default administrative distance (preference in Junos) of 20.
Why it's wrong here
iBGP preference in Junos is 170. eBGP preference is 170 as well (though external routes have protocol preference 170, wait, eBGP is 170, iBGP is 170, local is 0).
- ✓
eBGP routers prepend their own AS number to the AS_PATH attribute when advertising routes.
Why this is correct
Correct. eBGP adds its own AS number to the AS_PATH, whereas iBGP does not.
- ✓
eBGP peers must be directly connected by default, as the IP TTL for eBGP packets is set to 1.
Why this is correct
Correct. eBGP packets have a TTL of 1 by default, requiring direct physical or logical connection unless multihop is configured.
- ✗
The default TTL for iBGP packets is 1, requiring explicit multihop configurations for non-directly connected peers.
Why it's wrong here
iBGP has a default TTL of 255.
- ✗
iBGP routers modify the next-hop attribute to their own interface address by default when advertising routes to iBGP peers.
Why it's wrong here
iBGP preserves the next-hop by default, unlike eBGP.
About these practice questions
This JNCIS-ENT question is part of Courseiva's 506-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.