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.
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?
Port security
Why wrong: Port security filters based on MAC address, not IP.
IP Source Guard
IPSG validates source IP in data packets using the DHCP snooping binding table.
Dynamic ARP Inspection
Why wrong: DAI validates ARP packets, not data IP packets.
DHCP Snooping binding database
Why wrong: The binding database is used by IPSG; it does not filter traffic itself.
Answer choices
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.
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.
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.
Related concept
Read the scenario before looking for a memorised answer.
Dynamic ARP Inspection
DHCP Snooping binding database
Why it's wrong here
The binding database is used by IPSG; it does not filter traffic itself.
Common exam traps
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.
Detailed technical explanation
IPSG operates by installing a per-port ACL (PACL) that permits only traffic with a source IP matching the binding entry; it can also validate source MAC when configured with 'ip verify source port-security'. In a real-world scenario, if an attacker on an untrusted port sends packets with a spoofed source IP of a legitimate server, IPSG drops those packets because the source IP is not in the binding table for that port, even if the MAC address is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-601 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
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
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