The answer is ARP access lists and the DHCP snooping binding table. Dynamic ARP Inspection prevents ARP spoofing by first validating every ARP packet against the DHCP snooping binding table, which contains trusted IP-to-MAC mappings learned from DHCP transactions; if a packet’s sender MAC and IP do not match an entry in that table, DAI drops it as spoofed. For hosts with static IP addresses that do not use DHCP, DAI relies on ARP access lists to define authorized bindings, providing a second validation mechanism. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of how DAI enforces trust boundaries in a data center switch environment, often appearing in questions that ask you to identify the two validation sources or to distinguish them from unrelated features like port security or IP source guard. A common trap is forgetting that ARP ACLs are only needed for non-DHCP hosts, while the binding table handles dynamic clients. Memory tip: “DHCP for dynamic, ACL for static” — DAI uses both to cover all hosts.
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which two mechanisms are used by Dynamic ARP Inspection to prevent ARP spoofing? (Choose two.)
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✓
ARP access lists
Why this is correct
ARP ACLs can statically authorize certain ARP entries.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the enabling configuration (ARP inspectionVLAN 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.
Detailed technical explanation
How to think about this question
DAI intercepts all ARP requests and replies on untrusted ports and performs a lookup in the DHCP snooping binding table, which is built from DHCP messages. For static hosts, ARP ACLs can be configured with permit or deny entries matching IP-to-MAC bindings. A subtle behavior is that DAI also validates the source MAC address in the Ethernet header against the sender MAC in the ARP body; if they differ, the packet is dropped, even if the binding table entry matches.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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