350-401 Virtualization Practice Question
A network administrator is deploying a virtual switch on a Cisco UCS B-Series blade server. The administrator wants the virtual switch to be managed by Cisco UCS Manager and to support Cisco VM-FEX so that virtual machine traffic is visible to the upstream fabric interconnects. Which virtual switch technology meets these requirements?
⚠ Common exam trap
The trap here is assuming any Cisco virtual switch integrates with UCS Manager, when VM-FEX is the specific feature that provides that management and visibility.
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
✓
Cisco Virtual Machine Fabric Extender in UCS Manager
VM-FEX integrated with Cisco UCS Manager is the virtual switching technology that lets the fabric interconnect manage virtual interfaces and expose virtual machine traffic to upstream ports. It is administered from UCS Manager, which the administrator requires. Nexus 1000V, vSphere Standard Switch, and Open vSwitch do not provide UCS Manager-managed VM-FEX capability in this scenario.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cisco Nexus 1000V Virtual Supervisor Module
Why it's wrong here
The Nexus 1000V uses a Virtual Supervisor Module and Virtual Ethernet Modules to provide distributed virtual switching, but it is managed through the Nexus 1000V architecture rather than by Cisco UCS Manager. It does not deliver the VM-FEX integration with fabric interconnects that the administrator requires for visibility of virtual machine traffic upstream.
- ✓
Cisco Virtual Machine Fabric Extender in UCS Manager
Why this is correct
VM-FEX in Cisco UCS Manager presents virtual interfaces from the fabric interconnect down to the hypervisor, so virtual machine traffic is treated like traffic from a physical adapter. It is managed directly in UCS Manager and provides the upstream visibility the administrator wants, satisfying both requirements in the scenario.
- ✗
VMware vSphere Standard Switch
Why it's wrong here
A vSphere Standard Switch is configured per host in vCenter and has no awareness of Cisco UCS Manager or VM-FEX. It cannot be managed by UCS Manager and does not expose virtual machine traffic to the fabric interconnects, so it fails both stated requirements of the deployment.
- ✗
Open vSwitch with Cisco ACI integration
Why it's wrong here
Open vSwitch is a software virtual switch commonly used with OpenStack and can integrate with Cisco ACI through an opflex-based agent, but it is not managed by Cisco UCS Manager. Because the requirement is UCS Manager management and VM-FEX behavior on B-Series blades, this option does not meet the stated design.
Go deeper
Related to this question
Learn chapter
EtherChannel and Advanced Switching Technologies
Key term
Virtual Switch
A virtual switch is a software-based network switch that connects virtual machines within a hypervisor and forwards traffic between them and the physical network.
Key term
Virtual Machine Networking
Virtual machine networking is how virtual computers on a physical server connect to each other, to the internet, and to the rest of a network.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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