Hi, I'm Nikhlesh Yadav

A practical roadmap to understanding how DNS, IP addresses, ports, TCP, UDP, packets, HTTP, TLS, routers, firewalls, and application servers work together when you use the internet.

Learn what an HTTP request really contains, how GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS differ, and how browsers interpret URLs, headers, query strings, and request bodies.

Understand why computers use IP addresses, why people use domain names, and how DNS caches, resolvers, and authoritative servers translate a hostname into a reachable destination.

See how private devices share a public IPv4 address through NAT, how source and destination ports identify network flows, and why one server can safely run many services.

Learn how the TCP handshake creates reliable ordered communication, why UDP uses simpler datagrams, and how applications choose between reliability, latency, and control.

Follow application data as it is encapsulated into TCP segments, IP packets, and Ethernet or Wi-Fi frames, then forwarded through switches, routers, and a default gateway.

Trace a browser request from URL parsing and DNS through routers and NAT to a firewall, load balancer, reverse proxy, application, cache, database, and the response journey back.