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Computer networks connect devices, computers and other computers to share information, resources and services. They can be wired or wireless and set up in various network topologies. Networks are a must for businesses today, and help us communicate with each other, collaborate and work efficiently. They also assist with access to data and security.

Computer networking is a broad subject that encompasses the concept the design, structure, and maintenance of communication networks. It is a combination of electrical engineering.

The Internet is the most renowned computer network with billions of users to connect and share the same resources at the same time. The network utilizes a packet-switching model to channel data traffic through a nearly infinite number of paths and connections. Each packet is comprised of control information as well as information from the user. The control information comprises the destination and source network addresses, error detection codes and sequencing information. The data part of a packet is the payload.

In the typical business network there is central server that stores data and manages access to vital resources such as printers, files and photocopiers. The server is protected with firewalls and multifactor authentication systems to ensure that only authorized users of the network have access to it. Centralizing all data on servers also allows administrators to perform regular backups of data and to enforce strict network security policies. Additionally, it allows employees to access corporate apps and services regardless of whereabouts, such as, video-calling and document-sharing software.

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