- A
Enable promiscuous mode on the VM port group.
Why wrong: Promiscuous mode is for MAC address issues, not VLAN.
- B
Change the physical switch port to access mode on VLAN 100.
Why wrong: The physical switch is already trunking VLAN 100.
- C
Ensure the VM port group is set to VLAN 100.
The VM port group must match the VM's VLAN.
- D
Set the VM port group VLAN to 4095.
Why wrong: VLAN 4095 is used for VLAN tagging by the guest OS.
Question 262 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. 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 vSphere administrator is troubleshooting connectivity issues for a virtual machine on a standard switch. The VM is configured with VLAN 100, but cannot ping the default gateway. The VMkernel port on the host is on VLAN 200. The physical switch port connected to the host is configured as a trunk port allowing VLANs 100 and 200. Which action should the administrator take to resolve the issue?
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
✓
Ensure the VM port group is set to VLAN 100.
The VM is configured with VLAN 100, and the physical switch trunk port already allows VLAN 100 and 200. The VMkernel port on VLAN 200 is working, so the issue is that the VM port group must be explicitly set to VLAN 100 to tag egress frames with VLAN 100 and to accept only VLAN 100-tagged frames on ingress. Option C ensures the standard switch port group applies the correct VLAN ID, matching the physical switch trunk configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 promiscuous mode on the VM port group.
Why it's wrong here
Promiscuous mode is for MAC address issues, not VLAN.
- ✗
Change the physical switch port to access mode on VLAN 100.
Why it's wrong here
The physical switch is already trunking VLAN 100.
- ✓
Ensure the VM port group is set to VLAN 100.
- ✗
Set the VM port group VLAN to 4095.
Why it's wrong here
VLAN 4095 is used for VLAN tagging by the guest OS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the VM port group VLAN setting with the VMkernel port VLAN, or think that a trunk port on the physical switch automatically passes all VLANs to the VM without requiring the port group to be set to a specific VLAN ID.
Detailed technical explanation
How to think about this question
In vSphere standard switching, the VLAN ID on a port group determines the 802.1Q tag applied to outbound frames and the expected tag on inbound frames. The physical switch trunk port expects tagged frames for VLAN 100 and 200; if the VM port group is set to a different VLAN (or the default 0), frames will be either untagged or tagged incorrectly, causing the default gateway to be unreachable. A common real-world scenario is when a VM is moved between port groups or hosts and the VLAN ID is inadvertently left at the default (0), breaking connectivity despite correct physical trunking.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Configure and Manage vSphere Networking — study guide chapter
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure the VM port group is set to VLAN 100. — The VM is configured with VLAN 100, and the physical switch trunk port already allows VLAN 100 and 200. The VMkernel port on VLAN 200 is working, so the issue is that the VM port group must be explicitly set to VLAN 100 to tag egress frames with VLAN 100 and to accept only VLAN 100-tagged frames on ingress. Option C ensures the standard switch port group applies the correct VLAN ID, matching the physical switch trunk configuration.
What should I do if I get this VCP-DCV question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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