Lesson 2: How Do Computer Networks Work?

how do computer networks work?

Computer networks connect nodes like computers, routers, and switches by using cables, fiber optics, or wireless signals. These connections allow devices in a network to communicate and share information and resources.

Networks use a set of protocols, which define how communications are sent and received. These protocols allow devices to communicate with each other. The most common protocol used is TCP/IP which stands for Transmission Control Protocol, Internet Protocol.

The main purpose of TCP is to ensure data delivery and integrity through a system of checks and acknowledgements while IP is used to send data from one device to another. If a device wants to communicate over a network, it must obtain an IP address that uniquely identifies it, similar to a phone number.