350-601 Security Practice Question
A network administrator configures DHCP snooping on a Nexus 9000 switch. The legitimate DHCP server is connected to Ethernet 1/1. An unauthorized DHCP server is detected on Ethernet 1/2. Which action should be taken to prevent the unauthorized server from offering IP addresses?
⚠ Common exam trap
Cisco often tests the common misconception that you must set the port connected to the unauthorized server as untrusted (which is the default) rather than explicitly setting the legitimate server's port as trusted, leading candidates to incorrectly select option B or C.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set Ethernet 1/1 as a trusted port
DHCP snooping uses the concept of trusted and untrusted ports. By default, all ports are untrusted. Setting Ethernet 1/1, where the legitimate DHCP server is connected, as a trusted port allows DHCP server messages (OFFER, ACK, etc.) from that port to be forwarded. All other ports, including Ethernet 1/2, remain untrusted, so any DHCP server messages received on them are dropped, effectively blocking the unauthorized DHCP server.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable the DHCP snooping information option
Why it's wrong here
The information option (Option 82) is for relay agent information, not for blocking unauthorized servers.
- ✗
Set Ethernet 1/2 as a trusted port
Why it's wrong here
Setting the unauthorized port as trusted would allow it to act as a DHCP server, which is undesirable.
- ✗
Disable DHCP snooping globally
Why it's wrong here
Disabling DHCP snooping would remove all protection, not just stop the unauthorized server.
- ✓
Set Ethernet 1/1 as a trusted port
Why this is correct
The DHCP server port must be trusted to permit DHCP server messages such as OFFER and ACK.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.