VCP-DCV Configure and Manage vSphere Networking Practice Question
A vSphere administrator is designing a network for a cluster of ESXi hosts. Each host has four 10GbE uplinks. The cluster will host mission-critical VMs that require maximum throughput and redundancy. The administrator plans to use Network I/O Control (NIOC) and a vSphere Distributed Switch (vDS). Which configuration best ensures consistent network performance for all VMs?
⚠ Common exam trap
A common mix-up: candidates confuse load-balancing algorithms (like IP hash) with QoS mechanisms, assuming that distributing traffic across uplinks alone guarantees performance, when in fact NIOC's per-traffic-type resource controls are required to enforce consistent throughput for all VMs.
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 a single vDS with all four uplinks, enable NIOC, and set shares and reservations for each traffic type.
NIOC enables per-traffic-type resource management using shares, reservations, and limits, ensuring that mission-critical VMs receive consistent network throughput even under contention. Combining all four uplinks into a single vDS maximizes aggregate bandwidth and provides redundancy through teaming policies, while NIOC prioritizes traffic flows to prevent VMkernel or management traffic from starving VM traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure a single vDS with all four uplinks, enable NIOC, and set shares and reservations for each traffic type.
Why this is correct
NIOC provides minimum bandwidth guarantees and fair sharing.
- ✗
Configure a single vDS with all four uplinks and enable NetFlow for monitoring.
Why it's wrong here
NetFlow is for monitoring, not performance guarantees.
- ✗
Create two separate vDS, each with two uplinks, and separate VM traffic from VMkernel traffic.
Why it's wrong here
This provides isolation but no bandwidth guarantees.
- ✗
Configure a single vDS with all four uplinks and use Route based on IP hash teaming.
Why it's wrong here
This provides redundancy and load balancing but no bandwidth guarantees.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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