Lesson 2: IPv4 Addressing and Subnetting
Week of Tue, Sep 22 · lesson closes Mon, Sep 28
Take Meerk's quiz for Lesson 2
This lesson's items
Exact due times are in Canvas.
Watch — Professor Messer
Watch — Professor Messer: IPv4 Addressing (N10-009)
Free, independent educational resource. Not affiliated with or endorsed by CompTIA. Watch, then read the notes below.
Know these cold
- IPv4 32-bit; written in dotted decimal (4 octets). Classes: A (0–127, /8), B (128–191, /16), C (192–223, /24).
- Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. APIPA: 169.254.0.0/16.
- VLSM: variable-length subnet masking allocates differently-sized subnets from one address block to conserve IPs.
Meerk's quiz — open the Lesson 2 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 IPv4 ran out of public addresses, how are billions of new devices still getting online?
En español: Si IPv4 se quedó sin direcciones públicas, ¿cómo obtienen acceso a internet miles de millones de nuevos dispositivos?