350-601 Security Practice Question
Which TWO security features are used to prevent MAC address flooding attacks on a Cisco Nexus switch? (Choose two.)
⚠ Common exam trap
Cisco often tests the distinction between features that directly prevent MAC flooding (Port Security, DHCP Snooping) versus features that mitigate related spoofing attacks (IP Source Guard, Dynamic ARP Inspection), leading candidates to mistakenly select IP Source Guard.
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
✓
Port Security
Port Security (A) is correct because it limits the number of MAC addresses allowed on a switch port, preventing MAC flooding attacks by dropping frames from unknown source MACs once the limit is exceeded. DHCP Snooping (D) is correct because it builds a trusted database of IP-to-MAC bindings from DHCP messages, which can be used to validate traffic and prevent MAC spoofing that often accompanies flooding 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.
- ✓
Port Security
Why this is correct
Port Security limits the number of MAC addresses per port.
- ✗
IP Source Guard
Why it's wrong here
IPSG prevents IP spoofing, not MAC flooding.
- ✗
Control Plane Policing
Why it's wrong here
CoPP protects control plane, not MAC flooding.
- ✓
DHCP Snooping
Why this is correct
DHCP Snooping can rate-limit DHCP requests and prevent MAC flooding via the binding table.
- ✗
BPDU Guard
Why it's wrong here
BPDU Guard protects against spanning-tree attacks.
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.