JNCIP-ENT Layer 2 Authentication And Access Control Practice Question
You are troubleshooting an 802.1X deployment on an EX4300 switch. Clients fail to authenticate when using Supplicant-based authentication combined with MAC RADIUS fallback. You notice that the switch does not attempt MAC RADIUS after 802.1X times out. Which configuration error most likely caused this?
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 failed to include both dot1x and mac-radius within the interface authentication-order statement.
To fall back to MAC RADIUS when 802.1X fails, the 'authentication-order' statement must explicitly list both dot1x and mac-radius, and the fallback mechanism must be configured properly.
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 enabled static MAC pinning on the access port, which disables fallback mechanisms.
Why it's wrong here
Incorrect. MAC pinning does not prevent MAC RADIUS execution.
- ✗
You omitted the mac-radius statement from the global protocols access-profile configuration.
Why it's wrong here
Incorrect. Global profiles do not dictate authentication fallback order.
- ✗
You configured the supplicant mode as single-supplicant instead of multi-supplicant.
Why it's wrong here
Incorrect. Supplicant mode controls client counts per port, not fallback.
- ✓
You failed to include both dot1x and mac-radius within the interface authentication-order statement.
Why this is correct
Correct. The switch evaluates authentication methods based on the defined authentication-order.
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.
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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.