Computer Network and Its Usability:

Computer networks are the backbone of modern communication, enabling the seamless exchange of information between devices across the globe. At its core, a computer network is a collection of interconnected devices, such as computers, servers, routers, and switches, that can communicate with each other. These networks come in various shapes and sizes, ranging from small local area networks (LANs) within homes or offices to vast global networks like the internet. 

The primary purpose of a computer network is to facilitate communication and resource sharing. By connecting devices, users can share files, printers, internet connections, and other resources. This interconnectedness has revolutionized how we work, communicate, and collaborate, empowering individuals and organizations to access information and services from virtually anywhere. 

Computer networks rely on a variety of technologies and protocols to function effectively. Ethernet, Wi-Fi, and Bluetooth are common technologies used for wireless and wired connections between devices. Protocols like TCP/IP (Transmission Control Protocol/Internet Protocol) govern how data is transmitted and received over networks, ensuring reliable and efficient communication.

Network architecture varies depending on the scale and purpose of the network. In a typical setup, devices are connected to each other through switches and routers. Switches enable devices within a local network to communicate directly, while routers facilitate communication between different networks, such as connecting a local network to the internet.

Importance of Network Layer