What they are and what they are for computer networks (Summary)

What is a computer network? For many years computers have been isolated machines working independently and transfer of information is done for other physical media such as magnetic tapes, disks and diskettes. In the 80s if the computers were close, supporting data was transported easily, but if the location of the computers was very distant are complicated to used at perfection. Communication between computers began as a technical necessity in the process of implementation and expansion. One of the first solutions was using acoustic modems, which was an interface device for coupling electrical signals by Acoustical Means. Why computers could talk they share the same language or protocol of the comunicació.En grows the volume of data, computers need new features. The connection of networked computers has very important applications such features can be found in a network are: instant messaging system, email system, simultaneous work on the same document or database, centralized installation software, etc..