Quick Answer
The answer is Dynamic ARP Inspection (DAI) and DHCP Snooping. DAI is the feature that directly validates ARP packets by intercepting them on untrusted ports and cross-referencing each packet’s source MAC and IP against the DHCP snooping binding database, which is the authoritative record of legitimate IP-to-MAC mappings. DHCP Snooping itself builds that database by monitoring DHCP messages and filtering out unauthorized DHCP servers, making it the essential prerequisite for DAI to function. On the Cisco DCCOR 350-601 exam, this pairing is a classic two-part security concept: you must select both features to prevent ARP spoofing, as DAI without a populated snooping database cannot validate anything. A common trap is choosing only DAI, forgetting that DHCP Snooping provides the trusted binding table it relies on. Remember the mnemonic: DAI checks the ARP, but DHCP Snooping builds the map.
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 features are used to validate ARP packets and prevent ARP spoofing attacks? (Select exactly 2)
IP Source Guard
Why wrong: IP Source Guard validates IP packets, not ARP packets.
Private VLANs
Why wrong: Private VLANs isolate traffic but do not prevent ARP spoofing.
Dynamic ARP Inspection
DAI intercepts and validates ARP packets.
Port Security
Why wrong: Port Security limits MAC addresses but does not validate ARP.
DHCP Snooping
DHCP snooping builds the binding table used by DAI to validate ARP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Dynamic ARP Inspection
Dynamic ARP Inspection (DAI) is correct because it validates ARP packets by checking them against the DHCP snooping binding database, ensuring that only legitimate ARP replies and requests are forwarded. This prevents ARP spoofing attacks where an attacker sends falsified ARP messages to associate their MAC address with the IP address of a legitimate device.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IP Source Guard
Why it's wrong here
IP Source Guard validates IP packets, not ARP packets.
Private VLANs
Why it's wrong here
Private VLANs isolate traffic but do not prevent ARP spoofing.
Dynamic ARP Inspection
Port Security
Why it's wrong here
Port Security limits MAC addresses but does not validate ARP.
DHCP Snooping
Why this is correct
DHCP snooping builds the binding table used by DAI to validate ARP.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between features that validate ARP packets (DAI) versus features that validate IP packets (IP Source Guard) or limit MAC addresses (Port Security), causing candidates to confuse the scope of each security mechanism.
Detailed technical explanation
DAI intercepts all ARP packets on untrusted ports and verifies the sender MAC and sender IP against the DHCP snooping database; if no binding exists, the packet is dropped. In a real-world scenario, an attacker on an untrusted port cannot poison the ARP cache of other hosts because DAI will drop any ARP reply claiming a different MAC for a known IP, even if the attacker spoofs the source MAC. DAI also supports ARP ACLs for static mappings and rate limiting to prevent ARP flooding.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: Dynamic ARP Inspection — Dynamic ARP Inspection (DAI) is correct because it validates ARP packets by checking them against the DHCP snooping binding database, ensuring that only legitimate ARP replies and requests are forwarded. This prevents ARP spoofing attacks where an attacker sends falsified ARP messages to associate their MAC address with the IP address of a legitimate device.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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