Wi-Fi and Mobile Networks
Radio waves connect devices without cables.
About this topic
Wi-Fi and mobile networks carry Internet data through radio waves instead of cables. Wi-Fi connects devices to a local router within tens of metres, using standards such as 802.11 and frequency bands of 2.4 and 5 GHz. Mobile networks, such as 4G and 5G, use a grid of cells, each with a base station, so phones keep connections over wide areas.
When you move between cells, the network performs a handover so your call or download continues. Higher frequencies carry more data but travel shorter distances and are blocked more easily by walls, which is why 5G needs many small cells. Bandwidth is shared among everyone using a router or cell, so speeds drop when many connect. Wireless signals can be intercepted, so encryption such as WPA2 and WPA3 protects Wi-Fi traffic.
A common misconception is that Wi-Fi is the Internet; it is only the last link to a router that connects to the wired Internet. Another is that public Wi-Fi is safe without precautions; use HTTPS and avoid sensitive tasks on open networks. Place a router in a central spot to improve coverage.
Key ideas
- Wi-Fi uses 2.4 and 5 GHz
- Cell towers hand off signals
- 5G is faster
Quick check
Use cases: where Wi-Fi and Mobile Networks helps
- Homework: review the key idea behind Wi-Fi and Mobile Networks before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Wi-Fi and Mobile Networks without notes.
- Visual learning: play with the interactive lab to see how Wi-Fi and Mobile Networks changes when you adjust its inputs.
- Teaching a friend: explain Wi-Fi and Mobile Networks in your own words, then compare your version with the key ideas.
Computing ideas run phones, search engines, games and the wider internet.
Frequently asked questions
What is Wi-Fi and Mobile Networks?
Radio waves connect devices without cables.
What will I learn in Wi-Fi and Mobile Networks?
Wi-Fi uses 2.4 and 5 GHz. Cell towers hand off signals. 5G is faster.
Is Wi-Fi and Mobile Networks part of Computer Science?
Yes. It is one of 80 Computer Science topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Wi-Fi and Mobile Networks lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Wi-Fi and Mobile Networks?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.