Question 986 of 1,420
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350-401 Practice Question: Which three statements about dynamic ARP…
Which three statements about dynamic ARP inspection (DAI) are true? (Choose three.)
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
✓
DAI validates ARP packets by checking the sender MAC and IP addresses against the DHCP snooping binding table.
Dynamic ARP Inspection (DAI) is a security feature that validates ARP packets in a network. It uses the DHCP snooping binding table to verify the MAC-to-IP address mapping. DAI is configured on a per-VLAN basis and can be applied to specific interfaces. Rate limiting is used to prevent ARP storms. Option D is incorrect because DAI does not inspect ARP replies for IPv6; it is for IPv4 ARP only. Option E is incorrect because DAI does not validate the destination IP address of ARP requests; it validates the sender MAC and IP in the ARP body.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DAI validates ARP packets by checking the sender MAC and IP addresses against the DHCP snooping binding table.
Why this is correct
Correct because DAI uses the DHCP snooping database to ensure ARP packets are legitimate.
- ✓
DAI can be configured on a per-VLAN basis using the 'ip arp inspection vlan' command.
Why this is correct
Correct because DAI is enabled per VLAN with this global configuration command.
- ✓
DAI includes rate limiting to prevent ARP flooding attacks.
Why this is correct
Correct because rate limiting is a built-in feature to mitigate ARP storms.
- ✗
DAI inspects both IPv4 ARP and IPv6 Neighbor Discovery packets.
Why it's wrong here
Incorrect because DAI only works with IPv4 ARP; IPv6 uses ND and requires different mechanisms.
- ✗
DAI validates the destination IP address in ARP requests to prevent man-in-the-middle attacks.
Why it's wrong here
Incorrect because DAI validates the sender MAC and IP, not the destination IP in requests.
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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Last reviewed: Jun 18, 2026
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