JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
You are configuring MAC limiting on an EX Series switch interface to restrict the maximum number of learned MAC addresses to 10. What happens when the 11th unique MAC address attempts to communicate through the interface?
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 switch drops packets from the new MAC address and optionally logs or generates an SNMP trap.
By default, MAC limit drop or log actions occur. The standard configurable action when a limit is exceeded includes dropping the packet or shutting down the port.
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 switch drops packets from the new MAC address and optionally logs or generates an SNMP trap.
Why this is correct
Exceeding the MAC limit triggers the configured action, typically dropping new source MACs and logging.
- ✗
The switch immediately reboots the line card to protect the control plane.
Why it's wrong here
MAC limiting does not trigger line card reboots.
- ✗
The switch forwards the frame and clears the oldest learned MAC entry from the forwarding table.
Why it's wrong here
MAC limit violation actions do not use FIFO replacement by default.
- ✗
The switch dynamically converts the port into a routed Layer 3 interface.
Why it's wrong here
MAC limits do not change port encapsulation layers.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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.