Definition
A network is a collection of interconnected devices that can communicate with each other. These connections can be physical, like Ethernet cables, or wireless, such as Wi-Fi signals, enabling the sharing of data and resources. In practice, networks are designed and managed to facilitate seamless information flow and resource access between users and systems. Understanding network principles is crucial for IT professionals to ensure secure, efficient, and reliable operations, preventing unauthorized access and maintaining system uptime. For instance, a home Wi-Fi network connects your computers, phones, and smart devices to the internet and each other. This differs from a simple point-to-point connection, as a network typically involves multiple nodes and potential intermediaries. Network concepts are fundamental to certifications like CompTIA Network+, Security+, and AWS Certified Solutions Architect.