JNCIP-ENT Layer 2 Authentication And Access Control Practice Question
You are configuring an EX Series switch to use MAC RADIUS authentication. You notice that when devices connect, the switch sends authentication requests, but the accounting start packets are not being sent. What configuration is missing?
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
✓
You did not configure the accounting server and enable accounting under the access-profile hierarchy.
To enable accounting along with MAC RADIUS, you must explicitly enable accounting under the access profile associated with the interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
You must enable accounting globally using [edit system accounting radius].
Why it's wrong here
Incorrect. Junos access control uses access profiles for RADIUS accounting.
- ✗
You failed to enable accounting under the [edit protocols dot1x accounting] hierarchy.
Why it's wrong here
Incorrect. Dot1x hierarchy does not handle accounting server bindings.
- ✓
You did not configure the accounting server and enable accounting under the access-profile hierarchy.
Why this is correct
Correct. Access profile accounting configuration is required for accounting packets.
- ✗
MAC RADIUS does not support accounting; accounting is exclusive to 802.1X.
Why it's wrong here
Incorrect. MAC RADIUS fully supports accounting.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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 JNCIP-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 JNCIP-ENT exam.