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 security features rely on the DHCP snooping binding table? (Select exactly 2)
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 table to validate the source IP address of packets received on untrusted ports. It drops any packet whose source IP does not match an entry in the binding table, preventing IP spoofing attacks. Dynamic ARP Inspection (DAI) also relies on the DHCP snooping binding table to validate ARP packets, ensuring that the sender MAC and IP addresses match a legitimate binding, thereby blocking ARP poisoning attacks.
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.
IP Source Guard uses the DHCP snooping binding to permit only valid IP/MAC addresses.
Related concept
Read the scenario before looking for a memorised answer.
✗
Private VLANs
Why it's wrong here
Private VLANs are a Layer 2 isolation technique, not dependent on DHCP snooping.
✓
Dynamic ARP Inspection
Why this is correct
DAI intercepts ARP packets and validates them against the DHCP snooping database.
Related concept
Read the scenario before looking for a memorised answer.
✗
MACsec
Why it's wrong here
MACsec provides encryption and is independent of DHCP snooping.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the dependency of IP Source Guard and Dynamic ARP Inspection on the DHCP snooping binding table, and the trap here is that candidates confuse Port Security or MACsec as features that also rely on DHCP snooping, when in fact they operate independently.
Detailed technical explanation
How to think about this question
The DHCP snooping binding table is built by intercepting DHCP messages (DISCOVER, OFFER, REQUEST, ACK) on trusted ports and storing the client MAC, IP, VLAN, lease time, and port. IPSG performs a per-packet lookup in this table using the source IP and port, while DAI validates ARP packets by checking the sender MAC and IP against the same table. In a real-world scenario, if DHCP snooping is not enabled, both IPSG and DAI will fail to operate because the binding table is empty, leaving the network vulnerable to spoofing 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 — 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: IP Source Guard — IP Source Guard (IPSG) uses the DHCP snooping binding table to validate the source IP address of packets received on untrusted ports. It drops any packet whose source IP does not match an entry in the binding table, preventing IP spoofing attacks. Dynamic ARP Inspection (DAI) also relies on the DHCP snooping binding table to validate ARP packets, ensuring that the sender MAC and IP addresses match a legitimate binding, thereby blocking ARP poisoning attacks.
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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Question Discussion
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