FC0-U71 Infrastructure Practice Question
A small business is setting up a LAN. Which TWO of the following are characteristics of a LAN?
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
✓
Connects devices within a single building or campus
Option D is correct because a LAN (Local Area Network) is by definition confined to a limited area, such as a single building, office, or campus, which matches the small business scenario. Option E is correct because LANs typically use Ethernet (IEEE 802.3) for wired connections and Wi-Fi (IEEE 802.11) for wireless connections as their standard link-layer technologies. Option A is incorrect because cellular technology like 4G LTE belongs to WAN/MAN connectivity (WWAN), not a LAN. Option B is incorrect because a modem is used to connect a LAN to an external network/ISP, not to connect internal devices to each other; switches and access points serve that role. Option C is incorrect because covering a large geographic area such as a city describes a MAN or WAN, not a LAN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Uses cellular technology like 4G LTE
Why it's wrong here
Cellular technology such as 4G LTE provides WAN or mobile connectivity, whereas a LAN uses Ethernet or Wi-Fi within one premises. It is tempting because LTE can link a branch to the internet, yet that is the correct choice for remote or mobile access, not for local area networking.
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Requires a modem to connect all devices
Why it's wrong here
A modem connects a LAN to an external WAN or ISP; it is not required to connect devices within the LAN, which use switches and access points. It is tempting because internet access is often wanted, yet a modem is the correct choice only for the WAN uplink, not the internal LAN fabric.
- ✗
Covers a large geographic area such as a city
Why it's wrong here
Covering a city describes a metropolitan area network or WAN, not a LAN, which is confined to a single site such as one office or building. It is tempting because large organisations do span cities, yet that scale is exactly when a WAN or MAN is the correct designation.
- ✓
Connects devices within a single building or campus
Why this is correct
A LAN's defining scope is a single building or campus, so this satisfies the stem's small-business LAN constraint. Wider reach defines a WAN or MAN instead. This bounded geographic footprint is the characteristic that distinguishes local-area networking from those broader categories.
- ✓
Typically uses Ethernet or Wi-Fi
Why this is correct
Ethernet and Wi-Fi are the standard LAN access technologies, satisfying the small-business LAN requirement. Ethernet provides wired frames at the data-link layer, while Wi-Fi delivers wireless connectivity. Both operate within the local scope, unlike WAN links such as fibre or cellular.
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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.