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Computer networks connect computers and other devices to share resources, information, and services. They can be built on wireless or wired connections and can be configured in a variety of network topologies. Nowadays, networks are essential to business. They enable us to communicate more effectively, collaborate with colleagues and work more efficiently. They also aid in data security and access.

Computer networking is a broad field that involves the creation of, maintenance, and design of communication networks. It is a blend of computer science and electrical engineering.

The Internet is the most famous 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 direct data traffic through an almost limitless number of connections and pathways. Each packet contains control information and user information. The control information includes the destination and source network address along with error detection codes and sequencing information. The data portion of a package contains the payload.

In a typical business network there is a central server that stores data and manages access to essential resources like photocopiers, printers, files and printers. The server is secured by firewalls and multifactor authentication systems to ensure that only authorized network users can access it. The centralization of information stored on servers allows administrators and network security policy enforcers to perform regular backups. It also lets employees access corporate services and apps regardless of their location like video-calling software or document-sharing.