Networking Essentials: TCP/IP, DNS, and Beyond
Networking Essentials: TCP/IP, DNS, and Beyond Most people use the internet every day, but the ideas behind it can be unclear. This guide explains the essentials: TCP/IP, DNS, and a few ideas that go beyond the basics. The goal is to help you understand how devices talk, how names get resolved, and how to spot common problems in home and work networks. Understanding TCP/IP TCP/IP is a set of rules for sending data over networks. It splits communication into layers that work together. Four main layers matter most for beginners: Link, Internet, Transport, and Application. TCP helps ensure data arrives in order and without major gaps. IP is like the address system, moving packets from sender to receiver. Applications use ports to reach specific services, such as a web page on port 80 or 443. ...