350-601 Security Practice Question
Exhibit
Switch# show running-config | section interface interface Ethernet1/1 description DHCP Server switchport mode access ! interface Ethernet1/2 description Client switchport mode access ip verify source ! ip dhcp snooping ip dhcp snooping vlan 10 ip dhcp snooping information option
Refer to the exhibit. A client connected to Ethernet1/2 cannot obtain an IP address via DHCP. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the default untrusted state of all ports in DHCP snooping, leading candidates to overlook that the server port must be explicitly trusted, even when the server is on the same VLAN or reachable.
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
✓
The DHCP snooping trust configuration is missing on the server port
The client cannot obtain an IP address via DHCP because the DHCP server port (Ethernet1/1) is not configured as a DHCP snooping trusted port. By default, all ports are untrusted, and DHCP snooping drops all DHCP server responses (OFFER, ACK) received on untrusted ports. Configuring the port connecting to the DHCP server as trusted is required to allow these messages to reach the client.
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 snooping information option is disabled
Why it's wrong here
The option is enabled (ip dhcp snooping information option), so this is not the issue.
- ✗
The DHCP server is on a different VLAN
Why it's wrong here
DHCP snooping is enabled for VLAN 10, and the server is likely on that VLAN.
- ✓
The DHCP snooping trust configuration is missing on the server port
Why this is correct
Without trust, DHCP server messages are dropped on the untrusted port.
- ✗
IP source guard is enabled on the client port
Why it's wrong here
IP source guard can block IP spoofing, but DHCP replies are sent as Layer 2 broadcasts; source guard typically does not block valid DHCP.
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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.