The correct answer is that the VM_Network VLAN must be previously defined in the global VLAN database. This is because Cisco UCS Manager enforces a strict prerequisite: any VLAN referenced in a vNIC within a service profile must already exist in the global VLAN database before the vNIC can be applied or the service profile deployed. If the VLAN is not defined globally, the vNIC will fail to come up, and the service profile will remain in a configuration error state. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of UCS service profile vNet VLAN requirements, often appearing as a trap where candidates assume VLANs are auto-created or that a missing VLAN simply defaults to a native VLAN. A common memory tip is "Global first, vNIC second"—think of the global VLAN database as the master list that must be populated before any vNIC can reference it, much like a phone book must exist before you can look up a number.
350-601 Compute Practice Question
This 350-601 practice question tests your understanding of compute. 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.
Exhibit
Refer to the exhibit.
UCSM-A# scope org root
UCSM-A /org # create service-profile-template SP_Template
UCSM-A /org/service-profile-template # set vnic-order order-type user-defined
UCSM-A /org/service-profile-template* # create vnic vNIC_A
UCSM-A /org/service-profile-template*/vnic # set vnet VM_Network
UCSM-A /org/service-profile-template*/vnic # set fabric a
UCSM-A /org/service-profile-template*/vnic # set addr-pool derived
UCSM-A /org/service-profile-template*/vnic # set mtu 1500
UCSM-A /org/service-profile-template*/vnic # commit-buffer
UCSM-A /org/service-profile-template* # show profile detail
Refer to the exhibit. An engineer is creating a service profile template in Cisco UCSM. What is the effect of setting the vnet to 'VM_Network' for vNIC_A?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VM_Network VLAN must be previously defined in the global VLAN database.
Option A is correct because UCS requires that any VLAN referenced in a vNIC must already exist in the global VLAN database. Option B is false because VLANs are not created automatically; they must be defined manually beforehand. Option C is false because if the VLAN does not exist, the vNIC will not come up. Option D is false because VM_Network is a typical naming convention for data VLANs, not FCoE.
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.
✗
The VM_Network VLAN is a pre-defined FCoE VLAN for storage traffic.
The vNIC_A will be placed in VLAN 1 (default) if VM_Network does not exist.
Why it's wrong here
If the VLAN does not exist, the vNIC will fail to come up.
✗
The VM_Network VLAN will be created automatically as a standard VLAN.
Why it's wrong here
VLANs are not auto-created; manual global definition is required.
✓
The VM_Network VLAN must be previously defined in the global VLAN database.
Why this is correct
UCS requires VLANs to be defined globally before they can be assigned 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: The VM_Network VLAN must be previously defined in the global VLAN database. — Option A is correct because UCS requires that any VLAN referenced in a vNIC must already exist in the global VLAN database. Option B is false because VLANs are not created automatically; they must be defined manually beforehand. Option C is false because if the VLAN does not exist, the vNIC will not come up. Option D is false because VM_Network is a typical naming convention for data VLANs, not FCoE.
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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