JNCIS-ENT Tunnels Practice Question
Which THREE parameters can be optionally configured on a Junos GRE tunnel interface (gr-) to enhance functionality or security? (Choose three.)
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
✓
Tunnel key
GRE tunnel configurations support optional features such as tunnel keys, checksums, and explicit routing or TOS/DSCP copying.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP AS override
Why it's wrong here
BGP AS override is a BGP protocol feature, not a GRE tunnel interface parameter.
- ✗
IPsec encryption profile
Why it's wrong here
IPsec profiles are configured under security associations or IPsec VPN (st-) settings, not directly inside a gr- interface definition.
- ✓
Tunnel key
Why this is correct
A tunnel key can be configured to identify specific traffic streams or provide a basic layer of segmentation.
- ✓
Tunnel checksum
Why this is correct
A tunnel checksum can be enabled to verify packet integrity.
- ✓
IP TOS (Type of Service) inheritance / copying
Why this is correct
Junos allows copying the inner packet's TOS/DSCP bits to the outer GRE header.
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.