350-601 Security Practice Question
An attacker attempts to spoof a legitimate client's IP address to intercept traffic. DHCP snooping is enabled. Which feature prevents this spoofing by validating source IP in data packets?
⚠ Common exam trap
Cisco often tests the distinction between features that validate IP addresses (IPSG) versus those that validate ARP (DAI) or MAC addresses (port security), leading candidates to confuse DAI as the answer for IP spoofing prevention.
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
✓
IP Source Guard
IP Source Guard (IPSG) uses the DHCP snooping binding database to validate the source IP address in data packets received on untrusted ports. If a packet's source IP does not match an entry in the binding table, IPSG drops the packet, preventing IP spoofing 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.
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Port security
Why it's wrong here
Port security filters based on MAC address, not IP.
- ✓
IP Source Guard
Why this is correct
IPSG validates source IP in data packets using the DHCP snooping binding table.
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Dynamic ARP Inspection
Why it's wrong here
DAI validates ARP packets, not data IP packets.
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DHCP Snooping binding database
Why it's wrong here
The binding database is used by IPSG; it does not filter traffic itself.
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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.