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The term computer security is used frequently, but the content of a computer is vulnerable to few risks unless the computer is connected to other computers on a network. As the use of computer networks, especially the Internet, has become pervasive, the concept of computer security has expanded to denote issues pertaining to the networked use of computers and their resources.

On wireless computer networks, ad-hoc mode is a method for wireless devices to directly communicate with each other. Operating in ad-hoc mode allows all wireless devices within range of each other to discover and communicate in peer-to-peer fashion without involving central access points (including those built in to broadband wireless routers).

A computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected to other LANs over any distance via telephone lines and radio waves. A system of LANs connected in this way is called a wide-area network (WAN).
Most LANs connect workstations and personal computers. Each node (individual computer ) in a LAN has its own CPU with which it executes programs, but it also is able to access data and devices anywhere on the …

VPN, which is a private network that uses the Internet to connect to remote sites and users, allows “virtual” connections from the remote site or user to be routed through the Internet to the company’s private network. This is an alternative method to using a dedicated, real-world connection to an office network or LAN.
Since the Internet is a public domain, anyone with a computer, a modem, a phone line and Internet service can access it. Though the Internet fosters the idea of global community, VPN makes use of the Internet …