This 350-601 practice question tests your understanding of security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A network engineer is configuring DHCP snooping on a Cisco Nexus 9000 switch to prevent rogue DHCP server attacks. The switch connects to the legitimate DHCP server on Ethernet 1/1. Clients are connected to ports Ethernet 1/2 through 1/24. The engineer enables DHCP snooping globally and on VLAN 10, but clients are unable to obtain IP addresses from the DHCP server. Other connectivity between clients and the server works (e.g., static IPs). What is the most likely cause and solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ethernet 1/1 is untrusted by default. Configure it as trusted with 'ip dhcp snooping trust' and verify DHCP snooping is enabled on VLAN 10.
By default, all interfaces on a Cisco Nexus 9000 switch are untrusted for DHCP snooping. The legitimate DHCP server is connected to Ethernet 1/1, which must be explicitly configured as trusted using the 'ip dhcp snooping trust' interface command. Without this, the switch discards DHCP server messages (OFFER, ACK) received on that port, preventing clients from obtaining IP addresses even though DHCP snooping is enabled globally and on VLAN 10.
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.
✗
Disable DHCP snooping as it is not needed in this topology.
Why it's wrong here
This would remove protection; not the recommended solution.
✗
Configure a static DHCP binding for each client on the switch.
Why it's wrong here
Static bindings are used for DHCP reservation, not to fix the trust issue.
✓
Ethernet 1/1 is untrusted by default. Configure it as trusted with 'ip dhcp snooping trust' and verify DHCP snooping is enabled on VLAN 10.
Why this is correct
Correct. DHCP snooping requires the port towards the trusted server to be set as trusted to allow server messages.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add 'ip dhcp snooping information option' on Ethernet 1/1 to allow DHCP option 82.
Why it's wrong here
Option 82 insertion is not required for basic DHCP snooping and may cause issues if the server does not support it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the default untrusted state of all interfaces in DHCP snooping, leading candidates to assume that enabling snooping globally and on a VLAN is sufficient without configuring trust on the server-facing port.
Detailed technical explanation
How to think about this question
DHCP snooping builds a binding database by monitoring DHCP messages on trusted ports. When a server port is untrusted, the switch drops all DHCP server messages (OFFER, ACK, NAK) received on that interface, as defined in RFC 3046 and Cisco's implementation. The 'ip dhcp snooping trust' command must be applied to the interface facing the legitimate DHCP server; all other ports remain untrusted by default to prevent rogue server attacks. A common real-world scenario is a misconfigured trunk port carrying multiple VLANs where only the server-facing VLAN is enabled for snooping, but the trust command is missing on the trunk.
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: Ethernet 1/1 is untrusted by default. Configure it as trusted with 'ip dhcp snooping trust' and verify DHCP snooping is enabled on VLAN 10. — By default, all interfaces on a Cisco Nexus 9000 switch are untrusted for DHCP snooping. The legitimate DHCP server is connected to Ethernet 1/1, which must be explicitly configured as trusted using the 'ip dhcp snooping trust' interface command. Without this, the switch discards DHCP server messages (OFFER, ACK) received on that port, preventing clients from obtaining IP addresses even though DHCP snooping is enabled globally and on VLAN 10.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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