The answer is NVMe over RDMA, because it provides direct memory access and lower CPU overhead, making it the optimal choice for low latency storage in vSphere. Unlike iSCSI, which relies on TCP/IP processing that introduces latency and consumes CPU cycles, NVMe over RDMA leverages RDMA (often over RoCE v2 on 25 Gbps Ethernet) to bypass the kernel and transfer data directly between storage and application memory, drastically reducing latency and increasing IOPS for high-performance database workloads. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this question tests your understanding of storage protocol trade-offs for performance-sensitive workloads; a common trap is assuming iSCSI is sufficient because it is block-level, but the key differentiator is TCP overhead versus RDMA’s zero-copy capability. Remember the memory tip: “RDMA skips the stack, iSCSI stays on the rack” — direct memory access wins for low latency.
VCP-DCV Configure and Manage vSphere Storage Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere storage. 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 high-performance database workload on vSphere. The storage array supports NVMe over RDMA (NVMe-oF) and iSCSI. The workload requires extremely low latency and high IOPS. The network is dedicated 25 Gbps Ethernet with RoCE v2 support. Which storage protocol should be recommended, and why?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
NVMe over RDMA, because it provides direct memory access and lower CPU overhead
NVMe over RDMA leverages RDMA for lower latency and higher throughput compared to iSCSI over TCP. Option A is correct. Option B (iSCSI) has higher latency due to TCP overhead. Option C (FC) requires additional hardware. Option D (NFS) is file-level and adds more overhead.
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.
✗
NFS, because it supports advanced features like Storage DRS
Why it's wrong here
NFS is file-level and not optimal for block-level database workloads.
✓
NVMe over RDMA, because it provides direct memory access and lower CPU overhead
Why this is correct
NVMe-oF with RDMA reduces latency and CPU utilization.
Related concept
Read the scenario before looking for a memorised answer.
✗
Fibre Channel, because it is the fastest protocol available
Why it's wrong here
Fibre Channel can be fast but requires separate FC infrastructure; NVMe-oF can use existing Ethernet.
✗
iSCSI, because it is simpler to configure and does not require RDMA support
Why it's wrong here
iSCSI has higher latency and CPU overhead, not ideal for extreme performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the VCP-DCV exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Configure and Manage vSphere Storage — This question tests Configure and Manage vSphere Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: NVMe over RDMA, because it provides direct memory access and lower CPU overhead — NVMe over RDMA leverages RDMA for lower latency and higher throughput compared to iSCSI over TCP. Option A is correct. Option B (iSCSI) has higher latency due to TCP overhead. Option C (FC) requires additional hardware. Option D (NFS) is file-level and adds more overhead.
What should I do if I get this VCP-DCV question wrong?
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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