350-601 Security Practice Question
Which THREE security features are commonly used on Cisco Nexus switches to prevent DHCP-based attacks? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between features that directly prevent DHCP-based attacks (DHCP snooping, IP Source Guard, DAI) versus general security features like CoPP or Port security, which address different attack vectors and do not inspect DHCP protocol messages.
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
DHCP snooping is a security feature that acts as a firewall between untrusted hosts and DHCP servers. It filters DHCP messages by validating DHCP packets received on untrusted ports, dropping those that are invalid (e.g., DHCP server messages from a client port), and building a DHCP snooping binding database that maps client MAC addresses, IP addresses, VLAN, and port information. This database is then used by other features like IP Source Guard and Dynamic ARP Inspection to prevent IP spoofing and ARP poisoning attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Control Plane Policing (CoPP)
Why it's wrong here
CoPP protects the CPU from floods, but not DHCP attack specific.
- ✓
DHCP snooping
Why this is correct
DHCP snooping filters untrusted DHCP messages.
- ✗
Port security
Why it's wrong here
Port security limits MAC addresses, not DHCP-specific.
- ✓
IP Source Guard
Why this is correct
IP Source Guard prevents IP spoofing using DHCP binding.
- ✓
Dynamic ARP Inspection (DAI)
Why this is correct
DAI validates ARP packets using DHCP snooping binding to prevent ARP spoofing.
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.