VCP-DCV Configure and Manage vSphere Networking Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company has a single ESXi host with a standard switch. The administrator creates a new port group for a DMZ network and assigns a VM to it. The VM cannot ping the default gateway. The physical switch port is configured as a trunk with VLAN 100 allowed. The port group VLAN ID is set to 100. The physical NIC is connected to the switch port and shows link up. What should the administrator do to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify the VM's IP configuration
Option C is correct because the physical and virtual networking configurations appear correct (VLAN 100 on both sides, link up), so the issue is likely an IP misconfiguration on the VM itself. Option A (change VLAN to 0) would break connectivity. Option B (enable VLAN tagging) is unnecessary as the port group already tags VLAN 100. Option D (add second NIC) does not address the connectivity problem.
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.
✗
Enable VLAN tagging on the physical switch port
Why it's wrong here
The physical switch port is already configured as a trunk, so VLAN tagging is already enabled.
✗
Change the VLAN ID to 0
Why it's wrong here
Setting VLAN ID to 0 would remove VLAN tagging, causing mismatch with the physical switch trunk.
✓
Verify the VM's IP configuration
Why this is correct
If the gateway IP, subnet mask, or default gateway is misconfigured, the VM cannot ping the gateway despite correct VLAN settings.
Related concept
Access ports place end devices into a single VLAN.
✗
Add a second physical NIC to the standard switch
Why it's wrong here
Adding a NIC does not fix the existing connectivity issue; it would only provide redundancy.
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.
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 — 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: Verify the VM's IP configuration — Option C is correct because the physical and virtual networking configurations appear correct (VLAN 100 on both sides, link up), so the issue is likely an IP misconfiguration on the VM itself. Option A (change VLAN to 0) would break connectivity. Option B (enable VLAN tagging) is unnecessary as the port group already tags VLAN 100. Option D (add second NIC) does not address the connectivity problem.
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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