The correct answer is that VLANs must be defined in the global VLAN database before they can be used in a service profile, and each vNIC must have a native VLAN specified for untagged traffic. This is because the UCS domain operates on a centralized fabric interconnect architecture where the global VLAN pool acts as the single source of truth for all VLAN definitions; service profiles then reference these pre-existing VLANs rather than creating them locally. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of UCS VLAN configuration hierarchy and the distinction between global pool allocation and per-vNIC native VLAN assignment—a common trap is assuming VLANs can be created ad hoc within a service profile or that the native VLAN is optional. Remember the memory tip: "Global first, then assign; native VLAN is always defined."
350-601 Compute Practice Question
This 350-601 practice question tests your understanding of compute. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 engineer is configuring VLANs in a Cisco UCS domain. Which TWO statements are true regarding VLAN configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Each vNIC must have a native VLAN specified for untagged traffic on that vNIC.
Option A is correct because VLANs must be defined in the global VLAN database before they can be used in service profiles. Option D is correct because each vNIC must have a native VLAN specified for untagged traffic. Option B is false because VLANs cannot be created directly in service profiles. Option C is false because service profiles use VLANs from the global pool and cannot override the VLAN ID. Option E is false because VLANs can be created via both CLI and GUI.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
VLANs can be created directly within a service profile without prior global definition.
Why it's wrong here
VLANs cannot be created in service profiles; they must reference existing global VLANs.
✗
VLANs can be created only through the CLI of UCS Manager.
Why it's wrong here
VLANs can be created via both GUI and CLI.
✗
Service profiles can override the VLAN ID of a global VLAN definition.
Why it's wrong here
Service profiles reference global VLANs, not override them.
✓
Each vNIC must have a native VLAN specified for untagged traffic on that vNIC.
Why this is correct
A native VLAN is required for untagged frames on a vNIC.
Related concept
Access ports place end devices into a single VLAN.
✓
VLANs must be defined in the global VLAN database before they can be used in a service profile.
Why this is correct
UCS requires VLANs to be defined globally before assignment to vNICs.
Related concept
Access ports place end devices into a single VLAN.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Compute — This question tests Compute — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Each vNIC must have a native VLAN specified for untagged traffic on that vNIC. — Option A is correct because VLANs must be defined in the global VLAN database before they can be used in service profiles. Option D is correct because each vNIC must have a native VLAN specified for untagged traffic. Option B is false because VLANs cannot be created directly in service profiles. Option C is false because service profiles use VLANs from the global pool and cannot override the VLAN ID. Option E is false because VLANs can be created via both CLI and GUI.
What should I do if I get this 350-601 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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