- A
Type 2 hypervisor; it runs on top of an operating system, providing flexibility for VNF management.
Why wrong: Type 2 hypervisors (e.g., VirtualBox) run on a host OS and have higher overhead, which is not ideal for performance-sensitive VNFs.
- B
Type 1 hypervisor; it runs directly on the hardware, offering near-native performance for VNFs.
Type 1 hypervisors like vSphere provide direct access to hardware resources, minimizing latency and maximizing throughput for VNFs.
- C
Type 1 hypervisor; it requires a host OS for management, adding overhead.
Why wrong: Type 1 hypervisors do not require a host OS; they include a built-in management interface.
- D
Type 2 hypervisor; it is embedded in the hardware firmware.
Why wrong: Type 2 hypervisors are not embedded in firmware; they are software installed on an OS.
Quick Answer
The answer is a Type 1 hypervisor, because VMware vSphere runs directly on the physical hardware without a host OS, providing near-native performance for the Cisco CSR1000v VNF. This bare-metal architecture eliminates OS overhead, which is critical for the high-throughput packet processing and low-latency routing required in SD-WAN deployments. On the ENCOR 350-401 exam, this concept tests your understanding of virtualization fundamentals and VNF placement—a common trap is confusing Type 2 hypervisors (like VMware Workstation) with enterprise-grade Type 1 systems. Remember that any VNF handling real-time network functions must sit on a Type 1 hypervisor to avoid the performance penalty of a guest OS layer. A quick memory tip: Type 1 is “on the metal,” Type 2 is “on the OS.”
CCNP SD-WAN Architecture Practice Question
This 350-401 practice question tests your understanding of sd-wan architecture. 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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Type 2 hypervisors (e.g., VirtualBox) run on a host OS and have higher overhead, which is not ideal for performance-sensitive VNFs.
- ✓
Type 1 hypervisor; it runs directly on the hardware, offering near-native performance for VNFs.
Why this is correct
Type 1 hypervisors like vSphere provide direct access to hardware resources, minimizing latency and maximizing throughput for VNFs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Type 1 hypervisor; it requires a host OS for management, adding overhead.
Why it's wrong here
Type 1 hypervisors do not require a host OS; they include a built-in management interface.
- ✗
Type 2 hypervisor; it is embedded in the hardware firmware.
Why it's wrong here
Type 2 hypervisors are not embedded in firmware; they are software installed on an OS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, vSphere uses the VMkernel as a microkernel that directly controls CPU, memory, and I/O devices via native drivers, enabling features like DPDK (Data Plane Development Kit) for the CSR1000v to bypass the kernel network stack and achieve line-rate packet forwarding. In real-world SD-WAN scenarios, this direct hardware access allows the VNF to support features like IPsec encryption and QoS without performance degradation, which is essential for branch-office connectivity.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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SD-WAN Architecture — study guide chapter
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FAQ
Questions learners often ask
What does this 350-401 question test?
SD-WAN Architecture — This question tests SD-WAN Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
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.
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