The answer is to enable DHCP snooping globally and configure uplink ports as trusted. This configuration prevents a rogue DHCP server on the data center network because DHCP snooping acts as a firewall between untrusted access ports and trusted uplink ports, filtering out all DHCPOFFER and DHCPACK messages received on ports that are not explicitly trusted. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of Layer 2 security features in NX-OS, often appearing as a multiple-choice question where a common trap is to suggest IP Source Guard or Dynamic ARP Inspection alone, which rely on DHCP snooping to function. Remember that DHCP snooping must be enabled globally first, then the uplink ports—typically facing the legitimate DHCP server—must be manually set as trusted; all other ports remain untrusted by default. A useful memory tip is “Trust the trunk, block the access”—only the uplink to the real DHCP server should be trusted, while every access port is a potential rogue server vector.
350-601 Security Practice Question
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 administrator suspects that a rogue DHCP server is active on the data center network. The switches are Cisco Nexus 9000 series running NX-OS. Which configuration should be applied to prevent DHCP spoofing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable DHCP snooping globally and configure uplink ports as trusted.
DHCP snooping is the correct defense against rogue DHCP servers because it filters DHCP messages on untrusted ports and allows only DHCP replies from trusted uplink ports. By enabling DHCP snooping globally and configuring uplink ports as trusted, the switch will drop DHCPOFFER and DHCPACK messages received on access ports, preventing a rogue server from handing out malicious IP configurations.
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.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between DHCP snooping (which blocks rogue DHCP servers) and DAI or IPSG (which rely on DHCP snooping but address different threats), leading candidates to confuse the security feature with its prerequisite.
Detailed technical explanation
How to think about this question
DHCP snooping builds a binding database of (MAC, IP, VLAN, interface) tuples by monitoring DHCPACK messages on trusted ports. On Cisco Nexus 9000 switches, the 'ip dhcp snooping' global command and 'ip dhcp snooping trust' on uplink interfaces are required; by default, all ports are untrusted. In a real data center, if an uplink to a legitimate DHCP server is misconfigured as untrusted, valid DHCP replies will be dropped, causing connectivity failures—a subtle but common misconfiguration.
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: Enable DHCP snooping globally and configure uplink ports as trusted. — DHCP snooping is the correct defense against rogue DHCP servers because it filters DHCP messages on untrusted ports and allows only DHCP replies from trusted uplink ports. By enabling DHCP snooping globally and configuring uplink ports as trusted, the switch will drop DHCPOFFER and DHCPACK messages received on access ports, preventing a rogue server from handing out malicious IP configurations.
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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