CND Network Attacks And Defense Strategies Practice Question
A security team receives alerts indicating that an attacker is performing ARP cache poisoning on the local subnet to conduct a Man-in-the-Middle (MitM) attack. Which switch feature should the network administrator enable to mitigate this threat?
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
✓
Enable Dynamic ARP Inspection (DAI) bound to the DHCP snooping database.
DHCP snooping builds a trusted binding database of IP-to-MAC addresses. Dynamic ARP Inspection (DAI) uses this DHCP snooping database to intercept, log, and discard ARP packets with invalid IP-to-MAC address bindings, effectively stopping ARP poisoning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Dynamic ARP Inspection (DAI) bound to the DHCP snooping database.
Why this is correct
DAI validates ARP packets against the DHCP snooping table to drop spoofed ARP frames.
- ✗
Activate Unicast Reverse Path Forwarding (uRPF) on the default gateway router.
Why it's wrong here
uRPF operates at Layer 3 on routers for IP routing tables, not Layer 2 ARP tables on switches.
- ✗
Deploy IEEE 802.1Q VLAN trunking with native VLAN mismatch remediation.
Why it's wrong here
VLAN trunking segments broadcast domains; it does not stop local ARP poisoning.
- ✗
Configure Port Fast and BPDU Guard on all access-layer switch interfaces.
Why it's wrong here
Port Fast and BPDU Guard protect STP convergence and prevent unauthorized switches.
Visual reference
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 CND question from scratch — 323 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 CND 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 CND exam.