VCP-DCV vSphere Performance and Scaling Practice Question
Which TWO actions can help reduce network latency for a latency-sensitive VM in a vSphere environment? (Choose two.)
⚠ Common exam trap
Candidates often confuse throughput-enhancing features (like jumbo frames or TSO) with latency-reducing features, failing to recognize that SR-IOV and NetQueue directly address packet processing overhead and interrupt handling.
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
✓
Configure NetQueue on the physical NIC.
NetQueue improves network performance by distributing packet processing across multiple CPUs, reducing the overhead on a single core and lowering latency for latency-sensitive VMs. This is achieved by using multiple receive queues on the physical NIC, which allows parallel packet handling and minimizes interrupt coalescing delays.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a standard virtual switch instead of a distributed switch.
Why it's wrong here
Incorrect: Standard switches have fewer features; distributed switches can offer better performance with features like NetFlow and port mirroring.
- ✓
Configure NetQueue on the physical NIC.
Why this is correct
Correct: NetQueue distributes interrupts to multiple CPUs, reducing latency.
- ✓
Enable SR-IOV on the physical NIC and assign the virtual function to the VM.
Why this is correct
Correct: SR-IOV provides direct hardware access, reducing latency.
- ✗
Enable jumbo frames on the virtual switch.
Why it's wrong here
Incorrect: Jumbo frames reduce CPU usage but can increase latency due to larger frame size.
- ✗
Disable TCP segmentation offload on the VM.
Why it's wrong here
Incorrect: Disabling offloading increases CPU load and can increase latency.
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Senior Network & Security Engineer · founder of Courseiva
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