Networking Fundamentals

IP addresses, ports, DNS, HTTP, TLS, proxies and the tools to debug any connection.

Beginner 7 modules about 10 h Free
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  1. 1 How the Internet Moves Data Layers, packets and the journey of a request from your browser to a server and back. 25 min
  2. 2 IP Addresses, Subnets and Routing IPv4 and IPv6, CIDR notation, private ranges, NAT and how routes are chosen. 35 min
  3. 3 TCP, UDP and Ports Connections, ports, well-known services and the tools to see what is listening. 30 min
  4. 4 DNS in Depth Resolution, record types, TTLs and diagnosing DNS problems with dig. 35 min
  5. 5 HTTP and HTTPS Requests, responses, status codes, headers, cookies, TLS certificates and curl. 40 min
  6. 6 Proxies, Load Balancers and CDNs Reverse proxies with Nginx, load balancing, forwarded headers and caching at the edge. 35 min
  7. 7 Network Troubleshooting Toolkit A layer-by-layer method and the commands to find where any connection breaks. 30 min