Learn TCP/IP, IP addressing, subnetting, routing, switching, DNS, and DHCP with interactive labs.
Level: Beginner
Grade band: 9–12
Time: about 2 hours
Unit 1 — Network Foundations
How Networks Work
- OSI model overview — 15 min
- TCP/IP model — 12 min
- Ethernet and MAC addresses — 12 min
Unit 2 — IPv4 Addressing
IP Addressing
- IPv4 address structure — 15 min
- Subnet masks and CIDR — 20 min
- Subnetting practice — 25 min
Unit 3 — Routing & Switching
Routing & Switching
- How switches work — 12 min
- How routers work — 12 min
- Default gateway and routing tables — 15 min
Unit 4 — DNS & DHCP
DNS & DHCP
- How DNS works — 12 min
- DHCP and IP assignment — 10 min
Unit 5 — Network Security
Network Security Basics
- Firewalls and ACLs — 15 min
- VLANs and segmentation — 15 min
- Network monitoring basics — 12 min
Unit 6 — Troubleshooting
Network Troubleshooting
- Troubleshooting methodology — 12 min
- Using ping, traceroute, and nslookup — 20 min
- Common network problems — 15 min