JNCIS-ENT Tunnels Practice Question
An administrator needs to configure a basic GRE tunnel between two Junos devices across a routed IP network. Which interface family must be enabled on the physical transit interface to allow the GRE encapsulated packets to traverse the network?
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
✓
family inet
The physical transit interface must have the inet family enabled to route the outer IP packets containing the GRE encapsulation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
family mpls
Why it's wrong here
Family mpls is used for MPLS label switching, not required for standard IP-based GRE tunnels.
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family iso
Why it's wrong here
Family iso is used for IS-IS routing, not for standard GRE tunnel packet transit.
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family ccc
Why it's wrong here
Family ccc is used for circuit cross-connects, not for standard IP GRE transit.
- ✓
family inet
Why this is correct
The transit interface requires family inet to route the outer IP header of the GRE packet.
About these practice questions
Courseiva writes every JNCIS-ENT question from scratch — 506 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.