One infected phone, a whole building
A visitor joins the Wi-Fi with an infected phone. If every device is joined together, the infection can reach the till, the files and the servers.
Four defences stop this. Each one makes the attack harder.
Key words
| Word | What it means |
|---|---|
| Network | Devices joined together so they can share data. |
| Segmentation | Splitting a network into separate parts. |
| Isolation | Keeping one part completely apart from the rest. |
| Threat actor | A person or group that attacks. |
| Network monitoring | Using tools to watch and study traffic on a network. |
| Network hardening | Securing the links and systems between servers and devices that share a network. |
| Firewall | A control that allows or blocks traffic into and out of a network. |
| Traffic | The data moving across a network. |
| Port | A numbered door on a device where traffic can enter. |
The cells students fill in are left blank in this preview.
By the end of this lesson
Note
I can explain segmentation and isolation, network monitoring, network hardening and firewalls, and say how each reduces risk.
Starter: what you already know
Have a go
Starter: what you already know
3 questionsYour answers are marked here and are not kept. A college account keeps every student’s marks.
Segmentation and isolation
Segmentation splits a network into parts. Guests get one part. Staff get another. The servers get a third.
Isolation goes further. A part is kept completely apart, for example the machines that run a factory.
Why? A threat actor who gets into one part cannot easily move to the others. This limits the damage.
Network monitoring
Network monitoring uses tools to watch and study traffic. A tool learns what is normal. It then raises an alert when something looks odd, such as a laptop sending huge amounts of data at 3 am.
The aim is to stop threats and attacks early, or at least to spot them fast.
Check: segments and monitoring
Have a go
Check: segments and monitoring
4 questionsYour answers are marked here and are not kept. A college account keeps every student’s marks.