This 200-901 practice question tests your understanding of network fundamentals. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 designing a new branch network. They want to segment traffic into separate broadcast domains to improve security and reduce broadcast traffic. Which technology should be used to achieve this?
Spanning Tree Protocol
Why wrong: Prevents loops, does not segment broadcast domains.
Subnetting
Why wrong: Subnetting is Layer 3; broadcast domains are Layer 2.
EtherChannel
Why wrong: Bundles links, does not segment.
VLANs
VLANs create separate broadcast domains.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
VLANs
VLANs create separate Layer 2 broadcast domains, isolating traffic between groups. Subnetting (Option A) is a Layer 3 concept but does not create broadcast domains; it works with VLANs. STP (Option B) prevents loops. EtherChannel (Option D) bundles links.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Spanning Tree Protocol
Why it's wrong here
Prevents loops, does not segment broadcast domains.
Subnetting
Why it's wrong here
Subnetting is Layer 3; broadcast domains are Layer 2.
EtherChannel
Why it's wrong here
Bundles links, does not segment.
VLANs
Why this is correct
VLANs create separate broadcast domains.
Related concept
Access ports place end devices into a single VLAN.
Common exam traps
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
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.
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
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
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 200-901 questions on switching, trunking, and access-port configuration.
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FAQ
Network Fundamentals — This question tests Network Fundamentals — Access ports place end devices into a single VLAN..
The correct answer is: VLANs — VLANs create separate Layer 2 broadcast domains, isolating traffic between groups. Subnetting (Option A) is a Layer 3 concept but does not create broadcast domains; it works with VLANs. STP (Option B) prevents loops. EtherChannel (Option D) bundles links.
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 200-901 questions on switching, trunking, and access-port configuration.
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 24, 2026
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