A computer network is a group of connected devices that communicate with each other to share data and resources. It enables efficient communication and supports services like email, file sharing, and internet access. Nodes are devices such as computers, mobiles, or printers that exchange data. Routers and switches control and direct the flow of information. Transmission media carries data between devices. Wired media includes Ethernet and optical fiber cables. Wireless media includes Wi-Fi, Bluetooth, and infrared. Basic of Computer Networks Working A computer network operates by enabling devices to communicate and exchange data using a shared communication system. Each device in the network follows predefined rules to ensure that data is transmitted accurately, efficiently, and securely. Working Structure A network consists of nodes such as computers , servers , routers , and switches that send or receive data . These nodes are connected through links , which may be wired (cab...