easyMultiple Choice
350-401 Practice Question: Deploying a virtualized network function (VNF)…
A company is deploying a virtualized network function (VNF) for a Cisco CSR1000v router on a VMware vSphere hypervisor. The architect must choose the hypervisor type to ensure the best performance for the VNF. Which hypervisor type is VMware vSphere classified as, and why is it suitable for VNF deployment?
⚠ Common exam trap
Cisco often tests the distinction between Type 1 and Type 2 hypervisors by pairing the correct classification with a misleading justification (e.g., 'requires a host OS' for Type 1), so candidates must remember that Type 1 hypervisors run directly on hardware and do not rely on a general-purpose OS for core operations.
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
✓
Type 1 hypervisor; it runs directly on the hardware, offering near-native performance for VNFs.
VMware vSphere is a Type 1 (bare-metal) hypervisor because it installs directly onto the physical server hardware without requiring a host operating system. This architecture eliminates OS overhead, allowing the Cisco CSR1000v VNF to achieve near-native performance for packet processing and routing functions, which is critical for meeting throughput and latency requirements in SD-WAN deployments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Type 2 hypervisor; it runs on top of an operating system, providing flexibility for VNF management.
Why it's wrong here
A Type 2 hypervisor relies on a host operating system for device drivers and resource scheduling, which adds significant CPU and I/O overhead. While it offers flexibility to run on commodity OSes, the extra layer makes it unsuitable for VNFs that need deterministic, multi-Gigabit throughput. In Cisco SD-WAN deployments, virtual edge routers are almost exclusively hosted on bare-metal hypervisors like ESXi or KVM, not on Type 2 environments.
- ✓
Type 1 hypervisor; it runs directly on the hardware, offering near-native performance for VNFs.
Why this is correct
The correct answer is a Type 1 hypervisor because it runs directly on the physical hardware, giving VNFs direct access to CPU, memory, and NIC queues. This architecture minimizes latency and enables high-performance features like SR-IOV and DPDK, which are critical for SD-WAN edge devices handling real-time traffic. Cisco SD-WAN virtual appliances (vEdge, vSmart) are validated on ESXi and KVM, both Type 1 hypervisors, to guarantee near-native packet forwarding.
- ✗
Type 1 hypervisor; it requires a host OS for management, adding overhead.
Why it's wrong here
This option falsely claims that a Type 1 hypervisor requires a host OS for management. In reality, Type 1 hypervisors include a built-in management interface or run management tools as virtual appliances (e.g., VMware ESXi's vCenter, Xen's dom0) without a general-purpose host OS. Because there is no underlying OS, the hypervisor itself consumes fewer resources and avoids the overhead that this option incorrectly associates with the correct architecture.
- ✗
Type 2 hypervisor; it is embedded in the hardware firmware.
Why it's wrong here
Type 2 hypervisors are software packages that execute inside an existing OS, so they cannot be embedded in hardware firmware. Hardware firmware, such as UEFI, may provide virtualization extensions, but the hypervisor itself exists at the software layer of an installed OS. This choice confuses an embedded hypervisor (typically Type 1, like Xen or a system management firmware) with a hosted Type 2 hypervisor, and it is fundamentally wrong for the virtualized SD-WAN control plane.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.