The answer is enabling jumbo frames (MTU 9000) on both the virtual switch and physical network, as this directly reduces network latency for VMs in vSphere. By increasing the maximum transmission unit to 9000 bytes, each packet carries more data, which drastically cuts the number of packets per second the CPU must process. This reduction in packet overhead lowers processing delays and improves throughput, especially for storage and high-bandwidth workloads, since larger packets minimize fragmentation and interrupt handling. On the VCP-DCV exam, this concept tests your understanding of how network configuration choices impact performance; a common trap is assuming jumbo frames only benefit the virtual switch without configuring the physical network and adapters consistently. Remember the memory tip: “Bigger packets, fewer interrupts” — jumbo frames reduce CPU churn by letting each packet do more work, which is why they’re a go-to for latency-sensitive VM traffic.
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.
Which THREE actions would help reduce network latency for VMs in a vSphere environment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable jumbo frames on the virtual switch and physical network.
B is correct because enabling jumbo frames (MTU 9000) on both the virtual switch and physical network reduces CPU overhead and improves throughput by allowing larger packets, which decreases the number of packets per second and thus lowers latency for VM traffic. This is particularly effective for storage and high-bandwidth workloads, as it reduces fragmentation and processing delays.
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.
✗
Separate vMotion traffic onto a different VLAN.
Why it's wrong here
vMotion traffic separation does not affect VM network latency.
✓
Enable jumbo frames on the virtual switch and physical network.
Read the scenario before looking for a memorised answer.
✓
Assign dedicated physical NICs for VM traffic.
Why this is correct
Dedicated NICs avoid contention with other traffic.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing MTU on the virtual switch alone (Option C) as sufficient, forgetting that jumbo frames require end-to-end consistency across the entire physical network to avoid fragmentation and performance degradation.
Detailed technical explanation
How to think about this question
Jumbo frames reduce the number of packets required to send a given amount of data, which lowers the per-packet processing overhead on the CPU and NIC, and reduces the frequency of interrupts. In a vSphere environment, this is especially beneficial for vMotion, NFS, and iSCSI traffic, where large data transfers are common; however, the MTU must be set to 9000 on all intermediate devices, including physical switches, to avoid fragmentation, which can actually increase latency due to reassembly delays.
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 help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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 jumbo frames on the virtual switch and physical network. — B is correct because enabling jumbo frames (MTU 9000) on both the virtual switch and physical network reduces CPU overhead and improves throughput by allowing larger packets, which decreases the number of packets per second and thus lowers latency for VM traffic. This is particularly effective for storage and high-bandwidth workloads, as it reduces fragmentation and processing delays.
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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