JNCIP-ENT Layer 2 Authentication And Access Control Practice Question
An enterprise network uses 802.1X authentication with dynamic VLAN assignment on EX Series switches. A client authenticates, and the RADIUS server returns both a VLAN name and a set of dynamic firewall filter names via RADIUS attributes (Filter-Id). When the client connects, the VLAN assignment works perfectly, but the firewall filters are not applied to the interface. What is the most likely cause?
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
✓
The named firewall filters were not pre-configured and committed locally on the EX Series switch.
For dynamic Filter-Id attributes returned by RADIUS to be applied successfully on an EX Series switch, the named firewall filters must already be pre-configured and committed locally on the switch. If the filter does not exist locally, the application fails.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The dynamic filter must be defined inside the global access profile instead of being returned by RADIUS.
Why it's wrong here
Incorrect. Filter-Id is intended to be returned by RADIUS.
- ✓
The named firewall filters were not pre-configured and committed locally on the EX Series switch.
Why this is correct
Correct. Dynamic filters referenced by RADIUS Filter-Id must exist locally on the switch.
- ✗
RADIUS Filter-Id attributes are not supported on EX Series switches for dynamic firewall application.
Why it's wrong here
Incorrect. EX Series switches fully support Filter-Id attributes.
- ✗
Dynamic filter assignment requires MAC RADIUS and is not supported with 802.1X.
Why it's wrong here
Incorrect. Filter-Id is supported across 802.1X and MAC RADIUS.
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.