350-601 Security Practice Question
Which two mechanisms are used by Dynamic ARP Inspection to prevent ARP spoofing? (Choose two.)
⚠ Common exam trap
Many candidates confuse the enabling configuration (ARP inspection VLAN configuration) with the actual validation mechanism, or they mistakenly think port security or rate limiting directly prevent ARP spoofing, when in fact they serve different security purposes.
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
✓
DHCP snooping binding table
Dynamic ARP Inspection (DAI) validates ARP packets by comparing the sender MAC and IP addresses against the DHCP snooping binding table. If an ARP packet's MAC-IP binding does not match an entry in the binding table, DAI drops the packet, preventing ARP spoofing attacks. Additionally, DAI can use ARP access lists (ARP ACLs) to statically define valid MAC-IP bindings for hosts that do not use DHCP, providing an alternative validation mechanism.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DHCP snooping binding table
Why this is correct
DAI compares ARP packet MAC-IP pair with the binding table to detect spoofing.
- ✓
ARP access lists
Why this is correct
ARP ACLs can statically authorize certain ARP entries.
- ✗
Port security
Why it's wrong here
Port security limits MAC addresses but doesn't inspect ARP packets.
- ✗
ARP rate limiting
Why it's wrong here
Rate limiting prevents ARP flooding but does not validate packet authenticity.
- ✗
ARP inspection VLAN configuration
Why it's wrong here
This enables DAI on a VLAN but is not a mechanism used for validation.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco 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 350-601 exam.