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FC0-U71 Practice Question: A company has two departments on separate floors…
A company has two departments on separate floors and wants to connect them into a single local area network (LAN). Which device should be used to interconnect the switches on each floor?
⚠ Common exam trap
It's easy for candidates to confuse a router as necessary for connecting any two network segments, but when the goal is to extend the same LAN (same subnet and broadcast domain), a Layer 2 switch is the appropriate device, not a router.
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
✓
Switch
A switch is the correct device because it operates at Layer 2 (Data Link layer) and can forward frames based on MAC addresses, allowing multiple switches to be interconnected to extend a single broadcast domain and form a larger LAN. Connecting switches on different floors via Ethernet cables or fiber uplinks creates a unified local area network without requiring routing or network-layer addressing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Router
Why it's wrong here
Routers are used to connect different networks, not to extend a single LAN.
- ✗
Modem
Why it's wrong here
Modems connect to an internet service provider, not for local network interconnection.
- ✓
Switch
Why this is correct
Switches connect devices within the same network, allowing multiple switches to extend a LAN.
- ✗
Hub
Why it's wrong here
Hubs are legacy devices that broadcast all traffic and are not suitable for modern networks.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.