The correct design approach is to configure a single standard virtual switch and assign each VM to a separate port group with unique VLAN IDs. This works because each port group is mapped to a distinct 802.1Q VLAN, which tags every frame leaving the VM, ensuring Layer 2 isolation between tenants even when they share the same physical NICs. On the ENCOR 350-401 exam, this scenario tests your understanding of how VLAN tagging enforces multi-tenant isolation in virtualized environments—a common trap is assuming that separate virtual switches are required for isolation, but a single vSwitch with properly segmented port groups achieves the same result with less complexity. Remember the memory tip: "One switch, many VLANs—isolation without extra hardware."
350-401 Virtual Machines and Hypervisors Practice Question
This 350-401 practice question tests your understanding of virtual machines and hypervisors. 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 is deploying a multi-tenant data center using VMware vSphere. The architect must ensure that each tenant’s virtual machines (VMs) are isolated at Layer 2 while sharing the same physical NICs. Which design approach best meets this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a single standard virtual switch and assign each VM to a separate port group with unique VLAN IDs.
Option A is correct because configuring a standard virtual switch with separate port groups and unique VLANIDs provides Layer 2 isolation between tenants by leveraging 802.1Q VLAN tagging. Each VM’s traffic is tagged with its assigned VLAN ID, ensuring that VMs in different port groups cannot communicate directly at Layer 2, even though they share the same physical NICs.
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.
✓
Configure a single standard virtual switch and assign each VM to a separate port group with unique VLAN IDs.
Why this is correct
This isolates traffic at Layer 2 using VLANs, meeting the requirement.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a separate physical NIC for each tenant and bridge them to the VMs.
Why it's wrong here
This defeats the purpose of sharing physical NICs and is not scalable.
✗
Use a distributed virtual switch with VLAN trunking and assign all VMs to the same port group.
Why it's wrong here
All VMs on the same port group would share the same VLAN, breaking isolation.
✗
Enable promiscuous mode on the virtual switch to allow all VMs to see each other’s traffic.
Why it's wrong here
Promiscuous mode reduces isolation and is not a valid isolation technique.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VLAN trunking (which carries multiple VLANs on a single link) with port group assignment, mistakenly thinking that placing all VMs in the same port group with trunking provides isolation, when in fact it collapses all tenants into a single broadcast domain.
Detailed technical explanation
How to think about this question
In VMware vSphere, a standard virtual switch (vSwitch) operates at Layer 2 and uses VLANIDs to segment traffic; each port group acts as a VLAN access port, tagging frames with the specified VLAN ID. This design ensures that VMs in different port groups cannot communicate directly without a router, even if they reside on the same physical host. In a multi-tenant data center, this approach is cost-effective and scalable, as it avoids the need for separate physical NICs per tenant while maintaining strict isolation.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Virtual Machines and Hypervisors — This question tests Virtual Machines and Hypervisors — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a single standard virtual switch and assign each VM to a separate port group with unique VLAN IDs. — Option A is correct because configuring a standard virtual switch with separate port groups and unique VLAN IDs provides Layer 2 isolation between tenants by leveraging 802.1Q VLAN tagging. Each VM’s traffic is tagged with its assigned VLAN ID, ensuring that VMs in different port groups cannot communicate directly at Layer 2, even though they share the same physical NICs.
What should I do if I get this 350-401 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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