How servers talk — TCP/IP, ports, firewalls, DNS, CDNs, and proxies.
A network is just a group of computers that can send messages to each other. Learn what a network really is, the pieces that make one work, how data actually moves across it, the common types you'll meet, and why every server depends on one — explained from zero.
What actually happens between typing a web address and seeing the page load? Follow a single request across the real internet — DNS, IP addresses, routers, packets, and the round trip back — explained plainly, from zero.
TCP/IP is the set of rules that lets any two computers on Earth exchange data reliably. Learn what TCP and IP each do, how the layered model works, the difference between TCP and UDP, and how a single request actually travels — explained from zero.
HTTP is the language browsers and servers use to talk. HTTPS is that same language spoken over an encrypted connection. Learn what each one is, exactly what the 'S' protects, what it doesn't, and why every site today should be on HTTPS — explained from the ground up.
An IP address gets data to the right machine; a port gets it to the right program; a protocol decides what the conversation means. Learn how ports and protocols work together, the common ones you'll meet, and why they matter the moment you put something online — explained from zero.
A firewall is a filter that decides which network traffic is allowed and which gets blocked. Learn what firewalls really do, how rules and the default-deny mindset work, the difference between host and network firewalls, stateful vs stateless filtering, and how to think about them on a server.
A CDN is a network of servers spread around the world that keep copies of your site close to your visitors. Learn what a CDN really is, how it works, what edge caching means, and why it makes pages load faster and survive traffic spikes — explained from zero.
A proxy is a stand-in that passes requests on your behalf; a gateway is the doorway between two different networks or protocols. Learn what forward proxies, reverse proxies, and gateways actually do, how they differ, where each one sits, and why almost no real network runs without them.
DNS is the phone book of the internet, but it's far more clever than that. Take a deep look at how a domain name turns into an IP address — recursive resolvers, root and TLD servers, record types, caching, TTL, and why DNS changes feel so slow — explained step by step.
When something on the network stops working, the panic is optional. Learn a simple, repeatable way to diagnose connectivity problems — from 'is it even on?' all the way to DNS, ports, and firewalls — using a handful of universal commands and a layer-by-layer mindset.