Computer networks link computers and other devices to share resources, information and services. They can be wireless or wired and configured to work in a variety of network topologies. Networks are vital to business in the present and allow us to communicate with colleagues, collaborate and work more effectively. They also help with data security and access.

Computer networking is a broad field that covers the creation as well as the maintenance and construction of communication networks. It is a blend of electrical engineering.

The most famous computer network is the Internet, which enables billions of people to connect and access the same resources simultaneously. The network uses a packet-switching model to funnel data traffic through a nearly endless number of possible routes and connections. Each packet is comprised of information for control as well as information from the user. The control information contains the destination and normalize data in excel source network address, error detection codes, and sequencing information. The payload is contained in the data portion of a byte.

In a typical network a central server stores data and manages access by users to crucial resources such as printers, photocopiers, and other files. The server is protected by firewalls and a system of multifactor authentication to ensure that only authorized users have access to access the network. Centralizing all data on servers also makes it easier for administrators to carry out regular backups of data and to enforce strict security guidelines for the network. In addition, it enables employees to access corporate apps and services no matter their whereabouts, such as video-calling and document sharing software.