Securing Networks
What this unit covers
The topics below follow the published Cybersecurity course framework for Unit 3. Cybersecurity publishes no per-unit weighting, so there is no percentage to chase here.
Lessons in this unit
- Networks, Segmentation, and Firewalls20 min · 3 objectivesExplain how segmentation limits blast radius · Interpret firewall rules as allow or deny decisions · Use log evidence to identify suspicious network activity
- Protocols, Ports, and Secure Traffic18 min · 3 objectivesExplain protocol purpose, exposure, and encryption in transit · Apply the idea to evidence from a realistic technology scenario · Justify a decision using security, reliability, cost, and user impact
- Network Evidence and Incident Triage18 min · 3 objectivesExplain baselines, logs, indicators, and containment · Apply the idea to evidence from a realistic technology scenario · Justify a decision using security, reliability, cost, and user impact
Formulas in Unit 3
What examiners penalize here
- For a scenario about **protocol purpose, exposure, and encryption in transit**, identify the decisive evidence before naming a response. A defensible conclusion here is: Require HTTPS end to end and remove the unencrypted service rather than relying on users to notice the risk.
- For a scenario about **baselines, logs, indicators, and containment**, identify the decisive evidence before naming a response. A defensible conclusion here is: The combined indicators justify containment and investigation; a single blocked request alone would be weaker evidence.
Practice Cybersecurity
Our practice bank is drawn from across the whole course rather than filtered to one unit, which is closer to how the exam asks anyway — it will not tell you which unit a question is testing.
Questions about this unit
How much of the AP Cybersecurity exam is Unit 3?
The Cybersecurity course framework does not publish a per-unit weighting, so there is no percentage to quote for Unit 3 and anyone who gives you one is guessing. Spread your time by where your own errors are instead.
What topics are covered in Cybersecurity Unit 3?
Securing Networks covers Network attacks, Wireless security, Segmentation, Firewalls and Network logs.
How should I study Cybersecurity Unit 3?
Read the 3 lessons below first — about 55 minutes — then work practice questions on these topics. Finish with practice questions and read the explanation for every one you get right by elimination as well as the ones you miss.
All 5 units of AP Cybersecurity
Unit names, topics and exam weights follow the published College Board course framework for AP Cybersecurity. AP® is a trademark registered by the College Board, which does not endorse this site.