The answer is to enable NetQueue and increase the number of RX queues. This is correct because NetQueue distributes network packet processing across multiple CPU cores by leveraging multiple receive queues on the physical NIC, which directly reduces CPU bottlenecks and improves throughput for high-bandwidth workloads without requiring additional hardware. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this scenario tests your understanding of software-based performance tuning for 10GbE NICs, often appearing as a trap where candidates mistakenly assume new hardware is needed. A common memory tip is to think of NetQueue as “network parallelism”—more RX queues mean more cores sharing the load, just like adding lanes to a highway without building a new road.
VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. 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 vSphere administrator is tasked with scaling a cluster to support a new workload that requires high network throughput. The existing hosts have 10GbE NICs and are using the default vmnic driver. Which technology can improve network performance without additional hardware?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable NetQueue and increase the number of RX queues.
NetQueue is a VMware technology that distributes network packet processing across multiple CPU cores by increasing the number of receive (RX) queues on the physical NIC. This reduces CPU bottlenecks and improves throughput for high-bandwidth workloads without requiring additional hardware. The default vmnic driver in vSphere supports NetQueue, making it a software-only performance enhancement.
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.
✗
Enable SR-IOV on the physical NICs.
Why it's wrong here
SR-IOV may require hardware support and BIOS configuration, not purely software.
✓
Enable NetQueue and increase the number of RX queues.
Why this is correct
NetQueue distributes packet processing across multiple CPUs, improving network performance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the number of vCPUs for each VM.
Why it's wrong here
More vCPUs does not directly improve network throughput.
✗
Use vSphere vMotion to balance load.
Why it's wrong here
vMotion balances VMs but does not improve network performance per host.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SR-IOV as a software-only feature, but it requires hardware support and dedicated NIC configuration, whereas NetQueue is a native vSphere optimization that works with standard drivers and no extra hardware.
Detailed technical explanation
How to think about this question
NetQueue works by enabling multiple hardware receive queues on the NIC, each assigned to a different CPU core, allowing parallel packet processing and reducing interrupt overhead. In vSphere, the number of RX queues can be tuned via the `ethernetX.coalesceParams` or `netqueue` advanced settings, with a typical maximum of 8 queues per 10GbE NIC. This is especially beneficial for workloads like vSAN or NFV that generate high packet rates, as it prevents a single CPU core from becoming a bottleneck.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
vSphere Performance and Scaling — This question tests vSphere Performance and Scaling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable NetQueue and increase the number of RX queues. — NetQueue is a VMware technology that distributes network packet processing across multiple CPU cores by increasing the number of receive (RX) queues on the physical NIC. This reduces CPU bottlenecks and improves throughput for high-bandwidth workloads without requiring additional hardware. The default vmnic driver in vSphere supports NetQueue, making it a software-only performance enhancement.
What should I do if I get this VCP-DCV question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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