JNCIP-ENT Layer 2 Authentication And Access Control Practice Question
An administrator implements MAC RADIUS authentication on an EX Series switch. Several legacy printers connected to the ports fail to authenticate because they send their MAC addresses in uppercase letters with no separators (AABBCCDDEEFF), while the RADIUS server expects lowercase with colons (aa:bb:cc:dd:ee:ff). How can you resolve this mismatch on the Junos switch?
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
✓
Configure the MAC address format under the access-profile mac-radius options using the lowercase and colon-delimiter settings.
Junos OS allows configuring the MAC address format in MAC RADIUS requests via the 'mac-radius' settings under access profiles, allowing conversion to lowercase or specific separator formats.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable MAC-address translation (MAT) on the Ethernet switching table.
Why it's wrong here
Incorrect. MAT is for Layer 2 packet header rewriting, not RADIUS usernames.
- ✗
Configure the local user database to normalize MAC addresses automatically.
Why it's wrong here
Incorrect. MAC RADIUS uses external RADIUS servers, not local user databases.
- ✓
Configure the MAC address format under the access-profile mac-radius options using the lowercase and colon-delimiter settings.
Why this is correct
Correct. Access profiles support formatting options for MAC RADIUS requests.
- ✗
Configure a regex-based rewriting firewall filter on the interface facing the printers.
Why it's wrong here
Incorrect. Firewall filters cannot dynamically rewrite RADIUS authentication packet payloads.
Visual reference
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.