JNCIP-ENT Layer 2 Authentication And Access Control Practice Question
Which THREE diagnostic tools or show commands are useful when troubleshooting MAC RADIUS authentication failures on an EX Series switch? (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
✓
Traceoptions configured under protocols dot1x and access-profile for logging.
Troubleshooting MAC RADIUS involves checking traceoptions, access client states, and dot1x interface details.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Traceoptions configured under protocols dot1x and access-profile for logging.
Why this is correct
Correct. Traceoptions provide detailed debug logs for authentication flows.
- ✗
show access security clients
Why it's wrong here
Incorrect. This is not a valid Junos command.
- ✓
show dot1x interface detail
Why this is correct
Correct. Shows detailed dot1x and fallback operational states.
- ✗
traceroute mac-address
Why it's wrong here
Incorrect. Traceroute is for IP routing paths, not MAC RADIUS state checking.
- ✓
show access radius-server statistics
Why this is correct
Correct. Displays server reachability and packet counters.
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.