Mobile Networking · Course 1
How Apps Talk
Packets, addresses, DNS and ports: how data finds its way.
- 1Packets & IP Addresses12 min · See how a chat message becomes packets and what an IP address tells you.
- 2DNS: The Internet's Phone Book12 min · Follow a DNS lookup from your phone to the server that knows the answer.
- 3Ports & Protocols11 min · Learn how ports pick the right app and how TCP and UDP differ.
- 4NAT & Your Public IP12 min · Find out how many devices share one public IP, at home and on mobile data.
Hands-on
Do it on the simulated phone
Every lesson has a lab you can try in your browser, plus questions that earn points toward the Packet Pusher badge.
Start lesson 1