Networking essentials
IP addresses and subnets, how TCP, UDP and ports fit together, and the command-line tools for diagnosing connections.
- Beginner
- Level
- 3
- Lessons
- 6 min
- Study time
Course content
- 1. IP addresses and subnetsAn IPv4 address is 32 bits, written as four numbers from 0 to 255: 192.168.1.20.2 min
- 2. TCP, UDP and portsAn IP address gets data to the right machine. A port gets it to the right program on that machine. Ports are numbered 0 to 65535.2 min
- 3. Diagnosing connection problemsWhen "the site is down", work from the bottom up: name, then reachability, then the port, then the application.2 min