Lesson 9: Network Security
Week of Tue, Nov 10 · lesson closes Mon, Nov 16
Take Meerk's quiz for Lesson 9
This lesson's items
Exact due times are in Canvas.
Watch — Professor Messer
Watch — Professor Messer: Network Security (N10-009)
Free, independent educational resource. Not affiliated with or endorsed by CompTIA. Watch, then read the notes below.
Know these cold
- Firewall types: packet-filtering (ACLs), stateful inspection (tracks connection state), NGFW (application-layer, IPS, SSL inspection).
- DMZ: screened subnet exposing public services (web, email) while protecting internal network. Double-firewall model.
- Defense in depth: perimeter (firewall) → network (IDS/IPS/VLANs) → host (antivirus/EDR) → data (encryption) → user (MFA).
Meerk's quiz — open the Lesson 9 gate
10 questions, no time limit. 85% on your first attempt in a 24-hour window opens the gate. Retakes inside the window are practice — they help you learn, they don't count. Work alone; the point is to know it, not to have seen it.
Dinner Table Question
Ask at home: If a company has a firewall, why do they still need antivirus on every computer?
En español: Si una empresa tiene un firewall, ¿por qué todavía necesitan antivirus en cada computadora?