VCP-DCV Configure and Manage vSphere Networking Practice Question
A vSphere administrator is configuring Network I/O Control (NIOC) on a vSphere Distributed Switch to prioritize vMotion traffic during maintenance windows. The environment has three system traffic classes: Management, NFS, and vMotion. The administrator wants to ensure that when the network is congested, vMotion gets at least 50% of the available bandwidth, while Management and NFS each get at least 25%. Which NIOC configuration achieves this?
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
✓
Set the vMotion traffic class shares to 50, Management shares to 25, and NFS shares to 25.
Shares allocate bandwidth proportionally during contention. Setting the vMotion shares to 50, Management to 25, and NFS to 25 ensures that vMotion receives 50% of available bandwidth when all traffic classes are congested, while Management and NFS each get 25%. Option A is incorrect because limits cap bandwidth and do not guarantee proportional allocation; they would restrict vMotion to at most 500 Mbps regardless of available bandwidth. Option C is incorrect because reservations guarantee a minimum bandwidth but do not enforce proportional sharing during congestion; they would ensure each class gets at least the reserved amount but not necessarily the desired percentages when the total bandwidth exceeds the sum of reservations. Option D is incorrect because without NIOC, all traffic classes are treated equally, so vMotion would not get prioritized bandwidth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set a limit of 500 Mbps for Management and NFS, and no limit for vMotion.
Why it's wrong here
Limits cap Management and NFS at 500 Mbps, but vMotion could use all remaining bandwidth, not necessarily 50% during congestion.
- ✓
Set the vMotion traffic class shares to 50, Management shares to 25, and NFS shares to 25.
Why this is correct
Shares define relative priority; with these values, vMotion gets 50/100 = 50% during congestion, fulfilling the requirement.
- ✗
Set a reservation of 500 Mbps for vMotion, 250 Mbps for Management, and 250 Mbps for NFS.
Why it's wrong here
Reservations guarantee minimums but do not provide proportional allocation; they could lead to unused bandwidth not being redistributed proportionally.
- ✗
Do nothing; NIOC is not needed because all traffic types are equally important.
Why it's wrong here
Without NIOC, all traffic competes equally, so vMotion would not be prioritized, not meeting the requirement.
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