Screened subnet
Also called: DMZ, demilitarized zone
Course: AP® Cybersecurity Shows up in: Unit 3: Securing Networks
A network segment, created with firewall zones and rules, between the internet and the internal network that holds public-facing resources; a lower security zone.
Appears in the course and exam description (CED): 3.3.A.1
Why it matters in Unit 3
Outsiders reach the public servers without touching the internal network.
Example
The school website server sits in the screened subnet; the grade server does not.
Learn it properly, with a checkpoint 3.3 Protecting Networks: Segmentation