- A
Network I/O Control
Why wrong: Network I/O Control is used for allocating bandwidth and prioritizing traffic types, not for isolating traffic between VMs.
- B
Private VLAN
Private VLANs allow isolation within a VLAN by defining primary, community, and isolated VLANs, restricting traffic as needed.
- C
VLAN trunking
Why wrong: VLAN trunking is used to carry traffic from multiple VLANs across a single link, not to isolate traffic within a VLAN.
- D
Traffic shaping
Why wrong: Traffic shaping is for rate limiting and controlling traffic bursts, not for isolation.
- E
Port binding
Why wrong: Port binding determines the association of a virtual port to a physical host's pNIC, not traffic isolation.
Question 341 of 521
VCP-DCV Configure and Manage vSphere Networking Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere networking. 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 network administrator needs to isolate traffic between VMs in the same VLAN on a distributed switch. Which feature should be used?
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
✓
Private VLAN
Option B is correct because Private VLANs enable isolation between VMs within the same VLAN by dividing the VLAN into primary, isolated, and community sub-VLANs. Option A (Network I/O Control) is used for bandwidth allocation and does not provide traffic isolation. Option C (VLAN trunking) allows multiple VLANs over a single link, not isolation within a VLAN. Option D (Traffic shaping) controls rate limiting, not isolation. Option E (Port binding) determines port membership on a distributed switch, but does not isolate traffic within a VLAN.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Network I/O Control
Why it's wrong here
Network I/O Control is used for allocating bandwidth and prioritizing traffic types, not for isolating traffic between VMs.
- ✓
Private VLAN
- ✗
VLAN trunking
Why it's wrong here
VLAN trunking is used to carry traffic from multiple VLANs across a single link, not to isolate traffic within a VLAN.
- ✗
Traffic shaping
Why it's wrong here
Traffic shaping is for rate limiting and controlling traffic bursts, not for isolation.
- ✗
Port binding
Why it's wrong here
Port binding determines the association of a virtual port to a physical host's pNIC, not traffic isolation.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related VCP-DCV questions on switching, trunking, and access-port configuration.
- →
Configure and Manage vSphere Networking — study guide chapter
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Configure and Manage vSphere Networking practice questions
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FAQ
Questions learners often ask
What does this VCP-DCV question test?
Configure and Manage vSphere Networking — This question tests Configure and Manage vSphere Networking — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Private VLAN — Option B is correct because Private VLANs enable isolation between VMs within the same VLAN by dividing the VLAN into primary, isolated, and community sub-VLANs. Option A (Network I/O Control) is used for bandwidth allocation and does not provide traffic isolation. Option C (VLAN trunking) allows multiple VLANs over a single link, not isolation within a VLAN. Option D (Traffic shaping) controls rate limiting, not isolation. Option E (Port binding) determines port membership on a distributed switch, but does not isolate traffic within a VLAN.
What should I do if I get this VCP-DCV question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related VCP-DCV questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 24, 2026
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