JNCIS-ENT Tunnels Practice Question
What is the primary function of a Junos tunnel interface when used in conjunction with routing protocols?
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
✓
To provide a virtual point-to-point layer 3 link for routing protocol adjacencies across an untrusted or disjointed transport network.
Tunnel interfaces provide a virtual point-to-point link over which routing protocols can establish adjacencies and exchange routing information across an intermediate network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
To provide a virtual point-to-point layer 3 link for routing protocol adjacencies across an untrusted or disjointed transport network.
Why this is correct
Tunnel interfaces abstract transport networks, creating direct logical links for routing protocols.
- ✗
To act as a physical layer 2 bridge for VLAN extension without IP addresses.
Why it's wrong here
GRE and IP-IP are layer 3 tunneling mechanisms, not layer 2 bridge interfaces.
- ✗
To encrypt all transit traffic by default using hardware-based AES-256.
Why it's wrong here
GRE and IP-IP tunnels do not provide encryption; IPsec is required for encryption.
- ✗
To replace physical interfaces for standard local area network connections.
Why it's wrong here
Tunnel interfaces require an underlying transport network and physical interfaces.
About these practice questions
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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.