The answer is to enable Dynamic ARP Inspection (DAI) and IP Source Guard on untrusted ports. DAI validates ARP packets against a trusted DHCP snooping binding database, dropping any packet with an invalid IP-to-MAC mapping, which directly prevents an attacker from poisoning the switch’s ARP cache. IP Source Guard complements this by filtering traffic based on the same binding table, blocking spoofed IP addresses at the port level. On the Cisco SCOR 350-701 exam, this topic tests your understanding of Layer 2 security features within the “Content Security” domain, often appearing in scenario-based questions where you must choose the correct mitigation for a switched network. A common trap is confusing DAI with port security—remember that DAI specifically validates ARP, while port security limits MAC addresses. Memory tip: DAI “dials” into the DHCP snooping database to verify every ARP reply, so think “DAI + DHCP = ARP spoofing death.”
350-701 Security Concepts Practice Question
This 350-701 practice question tests your understanding of security concepts. 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 of the following are valid approaches to mitigate ARP spoofing attacks on a switched network?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Dynamic ARP Inspection (DAI) on VLANs
Dynamic ARP Inspection (DAI) is a security feature that validates ARP packets in a network. It relies on a DHCP snooping binding database to map IP addresses to MAC addresses, and it drops ARP packets that have invalid IP-to-MAC bindings, thereby preventing ARP spoofing attacks on a switched network.
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.
Read the scenario before looking for a memorised answer.
✓
Enable IP Source Guard on untrusted ports
Why this is correct
IP Source Guard filters traffic based on IP-MAC binding, preventing spoofing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Port Security on all access ports
Why it's wrong here
Port Security limits MAC addresses but does not prevent ARP spoofing.
✗
Enable DHCP Snooping globally
Why it's wrong here
DHCP Snooping is a prerequisite for DAI but does not directly mitigate ARP spoofing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the dependency chain: candidates may think DHCP Snooping alone mitigates ARP spoofing, but it only provides the database; DAI is the feature that actually enforces ARP validation.
Detailed technical explanation
How to think about this question
DAI intercepts all ARP requests and replies on untrusted ports and compares the sender MAC and sender IP against the DHCP snooping binding table. If no binding exists or the information mismatches, the ARP packet is dropped. In a real-world scenario, an attacker could send a gratuitous ARP claiming the gateway's IP with their own MAC; DAI would drop this if the binding table shows the gateway's MAC is different, preventing man-in-the-middle attacks.
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 Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Dynamic ARP Inspection (DAI) on VLANs — Dynamic ARP Inspection (DAI) is a security feature that validates ARP packets in a network. It relies on a DHCP snooping binding database to map IP addresses to MAC addresses, and it drops ARP packets that have invalid IP-to-MAC bindings, thereby preventing ARP spoofing attacks on a switched network.
What should I do if I get this 350-701 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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Question Discussion
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