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.
Exhibit
```
ip dhcp snooping
ip dhcp snooping vlan 10,20
interface Ethernet1/1
ip dhcp snooping trust
interface Ethernet1/2
ip dhcp snooping verify mac-address
```
Refer to the exhibit. A DHCP server is connected to Ethernet1/1 and a client in VLAN 10 is connected to Ethernet1/2. The client obtains an IP address. Which statement is best supported?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The DHCP server port is trusted for all VLANs
Option C is correct because when a DHCP server is connected to a switch port and clients in different VLANs (like VLAN 10) obtain IP addresses, the switch must trust the DHCP server port for all VLANs. This is typically achieved by configuring the port as a DHCP snooping trusted port or by using an IP helper address on the VLAN interface. Without trust, DHCP snooping would drop server responses on untrusted ports, preventing the client from obtaining an address.
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.
✗
The DHCP server is in VLAN 20
Why it's wrong here
Not necessarily; the server could be in any VLAN that is snooped.
The 'ip dhcp snooping trust' command on the interface makes it trusted for all snooped VLANs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The DHCP client MAC address is not verified
Why it's wrong here
The verify mac-address is configured, so MAC verification is enabled.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a DHCP server must be in the same VLAN as the client, when in fact a trusted port or IP helper address allows cross-VLAN DHCP communication.
Detailed technical explanation
How to think about this question
DHCP snooping operates by categorizing switch ports as trusted (where DHCP server responses are allowed) or untrusted (where DHCP server responses are dropped). The trusted port configuration is essential when a DHCP server is directly connected, as it bypasses the default filtering that prevents rogue DHCP server attacks. In real-world scenarios, this is often combined with IP Source Guard and Dynamic ARP Inspection to enforce IP-to-MAC bindings and prevent spoofing.
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: The DHCP server port is trusted for all VLANs — Option C is correct because when a DHCP server is connected to a switch port and clients in different VLANs (like VLAN 10) obtain IP addresses, the switch must trust the DHCP server port for all VLANs. This is typically achieved by configuring the port as a DHCP snooping trusted port or by using an IP helper address on the VLAN interface. Without trust, DHCP snooping would drop server responses on untrusted ports, preventing the client from obtaining an address.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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