200-901 Network Fundamentals Practice Question
A network administrator is configuring a switch and needs to segment traffic into multiple broadcast domains while also allowing communication between them. Which device or feature should be used to achieve this?
⚠ Common exam trap
The trap here is assuming that any switch feature can segment broadcast domains, but only VLANs (and routers) can do that; features like STP or EtherChannel do not.
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
✓
VLANs on a switch
VLANs are used to logically segment a switch into multiple broadcast domains. Each VLAN represents a separate broadcast domain, and devices within a VLAN can communicate at Layer 2. To enable communication between VLANs, inter-VLAN routing is needed. STP, EtherChannel, and port mirroring do not create broadcast domains; they serve other purposes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Port mirroring on a switch
Why it's wrong here
Port mirroring copies traffic from one port to another for monitoring purposes. It does not segment broadcast domains. It is a troubleshooting feature, not a segmentation mechanism. The scenario requires creating multiple broadcast domains, which port mirroring cannot do.
- ✗
STP on a switch
Why it's wrong here
STP (Spanning Tree Protocol) prevents loops in a Layer 2 network by blocking redundant paths. It does not segment broadcast domains; all ports in the same VLAN are part of the same broadcast domain regardless of STP. STP is about loop prevention, not segmentation.
- ✗
EtherChannel on a switch
Why it's wrong here
EtherChannel bundles multiple physical links into a single logical link for increased bandwidth and redundancy. It does not create separate broadcast domains. All links in an EtherChannel belong to the same VLAN and broadcast domain. It is used for link aggregation, not segmentation.
- ✓
VLANs on a switch
Why this is correct
VLANs (Virtual LANs) logically segment a switch into multiple broadcast domains. Each VLAN is a separate broadcast domain. To allow communication between VLANs, a Layer 3 device (like a router or a Layer 3 switch) is required. The scenario asks for segmentation into broadcast domains, which VLANs provide.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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