212-89 Network Incidents Practice Question
Which TWO of the following are common signs of a compromised switch in a local area network?
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
✓
Unrecognized trunk ports enabled
MAC flooding and unauthorized trunking are common signs of layer 2 switch compromise.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Unrecognized trunk ports enabled
Why this is correct
Unauthorized trunk ports allow VLAN hopping attacks.
- ✗
Normal spanning-tree convergence
Why it's wrong here
Normal convergence is not an indicator of compromise.
- ✗
Decreased CPU usage on the switch
Why it's wrong here
Compromise usually increases load due to processing malicious traffic.
- ✓
Unexpected MAC address table growth (MAC flooding)
Why this is correct
MAC flooding is used to turn a switch into a hub for sniffing.
- ✗
Stable port security status
Why it's wrong here
Stability is a positive, not an indicator of a problem.
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
Courseiva writes every 212-89 question from scratch — 206 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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 EC-Council exam blueprint
This 212-89 practice question is part of Courseiva's free EC-Council 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 212-89 exam.