The answer is to configure the port connected to the DHCP server as trusted. This is correct because DHCP snooping, by default, treats all switch ports as untrusted, meaning they will drop any DHCP server messages like OFFER, ACK, or NAK. By designating the specific port that connects to the legitimate DHCP server as trusted, you explicitly allow only that port to forward these server responses, effectively blocking any rogue DHCP server from assigning malicious IP addresses and ensuring network integrity. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of DHCP snooping’s fundamental security mechanism; a common trap is assuming that enabling DHCP snooping globally is enough, but you must remember that the trusted port configuration is the critical step that actually validates the server. A simple memory tip: trust the server port, distrust everything else.
350-601 Security Practice Question
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.
A data center switch has DHCP snooping enabled globally. Which of the following is a best practice to ensure DHCP server legitimacy?
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
✓
Configure the port connected to the DHCP server as trusted
Configuring the port connected to the DHCP server as trusted is a best practice because DHCP snooping treats all ports as untrusted by default. Only trusted ports are allowed to forward DHCP server messages (OFFER, ACK, NAK), preventing rogue DHCP server attacks. This ensures that only the legitimate DHCP server can assign IP addresses, maintaining network integrity.
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.
✓
Configure the port connected to the DHCP server as trusted
Why this is correct
Trusted ports are allowed to forward DHCP server messages, preventing rogue servers.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable DHCP snooping on the DHCP server VLAN
Why it's wrong here
Disabling snooping on the VLAN would allow rogue servers.
✗
Set the DHCP server IP address in the binding database
Why it's wrong here
The binding database is built dynamically from trusted port traffic.
✗
Enable DHCP snooping on all VLANs
Why it's wrong here
Enabling on all VLANs is not a best practice; trust configuration is key.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that enabling DHCP snooping globally or on all VLANs is sufficient for server legitimacy, when the actual requirement is to explicitly configure the server-facing port as trusted.
Detailed technical explanation
How to think about this question
DHCP snooping works by intercepting DHCP messages at the switch and validating them against a binding table built from DHCPACK messages. Trusted ports bypass this validation for server messages, while untrusted ports drop any DHCP server responses (OFFER, ACK, NAK) unless they match an existing binding. In a real-world scenario, an attacker plugging a rogue DHCP server into an untrusted port would be blocked, preventing IP address spoofing and man-in-the-middle 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: Configure the port connected to the DHCP server as trusted — Configuring the port connected to the DHCP server as trusted is a best practice because DHCP snooping treats all ports as untrusted by default. Only trusted ports are allowed to forward DHCP server messages (OFFER, ACK, NAK), preventing rogue DHCP server attacks. This ensures that only the legitimate DHCP server can assign IP addresses, maintaining network integrity.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
easy
A.The DHCP server is in VLAN 20
B.The DHCP client is using a static IP address
✓ C.The DHCP server port is trusted for all VLANs
D.The DHCP client MAC address is not verified
Why C: 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.
Last reviewed: Jun 24, 2026
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