The answer is that the physical uplink vmnic0 is not configured as a trunk on the physical switch. This is correct because the DHCP server sits on an access port for VLAN 100, expecting tagged traffic, while the virtual machine’s “VM Network” port group uses untagged VLAN 0. For the DHCP request to traverse the physical switch and reach the server, the uplink port must be set as a trunk to carry VLAN 100 frames; otherwise, the switch drops or misroutes the traffic, causing the IP assignment failure. On the VCP-DCV exam, this scenario tests your understanding of how virtual switch port groups interact with physical switchport modes—a common trap is assuming an access port on the server side automatically matches the VM’s untagged traffic. Remember the memory tip: “Trunk the uplink, or the DHCP will sink.”
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.
Exhibit
Refer to the exhibit.
[root@esxi01:~] esxcli network vswitch standard list
Standard Switch: vSwitch0
Name: vSwitch0
Class: cSwitch
Num Ports: 128
Used Ports: 3
Configured Ports: 128
MTU: 1500
CDP: listen
Beacon Enabled: false
Beacon Interval: 0
Uplinks: vmnic0
Portgroups:
Management Network
VLAN ID: 0
Used Ports: 1
Uplinks: vmnic0
VM Network
VLAN ID: 100
Used Ports: 1
Uplinks: vmnic0
VMkernel Network Adapters:
vmk0
Portgroup: Management Network
IP Address: 192.168.1.10
Subnet Mask: 255.255.255.0
MAC Address: 00:50:56:ab:01:01
A virtual machine connected to the 'VM Network' port group is unable to obtain an IP address from the DHCP server located on the same subnet (192.168.1.0/24). The DHCP server is connected to the physical switch which is configured as an access port for VLAN 100. What is the most likely cause of the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The physical uplink vmnic0 is not configured as a trunk on the physical switch.
The DHCP server is connected to a physical switch port configured as an access port for VLAN 100, meaning it expects untagged traffic on VLAN 100. However, the virtual machine is connected to the 'VM Network' port group, which by default is untagged (VLAN ID 0). For the VM's DHCP request to reach the server, the physical uplink (vmnic0) must be configured as a trunk port on the physical switch to carry the VLAN 100 traffic; otherwise, the switch will drop or misdirect the frames, preventing DHCP from working.
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.
✓
The physical uplink vmnic0 is not configured as a trunk on the physical switch.
Why this is correct
The port group tags frames with VLAN 100, so the physical switch port must be a trunk to accept tagged frames.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The port group should use a different VLAN ID.
Why it's wrong here
The VLAN ID is set as needed; the issue is the physical switch configuration.
✗
The standard switch has MTU of 1500 but DHCP uses 1500.
The physical switch port is configured for VLAN 100, so the DHCP server is likely on VLAN 100.
✗
The VMkernel port vmk0 has an IP address in the same subnet but is not required for DHCP.
Why it's wrong here
The VMkernel port is not involved in VMDHCP traffic; it is used for management.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the DHCP server's access port configuration automatically matches the VM's network, overlooking the requirement for the physical uplink to be a trunk to carry the VLAN-tagged or untagged traffic correctly.
Detailed technical explanation
How to think about this question
In vSphere, a standard switch with VLAN ID 0 (or 'None') means the port group does not tag frames, so the physical switch must be configured as a trunk port to allow the VLAN 100 traffic to pass. Without trunking, the access port expects untagged frames on VLAN 100, but the VM's untagged frames are dropped or treated as VLAN 1 by default. A common real-world scenario is when an administrator forgets to set the VLAN ID on the port group or fails to configure the uplink as a trunk, leading to silent DHCP failures.
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.
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.
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: The physical uplink vmnic0 is not configured as a trunk on the physical switch. — The DHCP server is connected to a physical switch port configured as an access port for VLAN 100, meaning it expects untagged traffic on VLAN 100. However, the virtual machine is connected to the 'VM Network' port group, which by default is untagged (VLAN ID 0). For the VM's DHCP request to reach the server, the physical uplink (vmnic0) must be configured as a trunk port on the physical switch to carry the VLAN 100 traffic; otherwise, the switch will drop or misdirect the frames, preventing DHCP from working.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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