What is the computer network?
There are many definitions of what the computer networks are. The definitions starting with phrase of the system of linked computers are misled because you could make a network without the linked computers. This network is characterized by people running back and forth between computers with floppy disks in their hands. Under this network, the computers are not linked physically but they still communicate data each other. Therefore, I would like to define it as follows. The computer network is the communication of data from one computer to one or more computers by any means such as people, wires, cables, or a telecommunications system.
A local area network (LAN) is the communication of a number of computers by cable connecting to each one in a single location, usually a single floor of a building or all the computers in a small company. LANs may be contrasted with wide area networks (WANs). Stated simply, WANs are the communication between LANs by telephone lines leased form the various telephone companies, satellite links, packet radio, or microwave transceivers.
WANs are private and owned by the business that operates with them. The Internet has emerged as both the largest and the least expensive WAN in the world recently. Many companies take advantage of it now by forming private WANs, known as VPNs, or Virtual Private Networks, through encrypted communications over the Internet.
Network administrator has full rights and permissions to all resources on a network. The administrator is usually responsible for installing, managing, and controlling servers and networking components. Administrators can also modify the properties of user accounts and the membership of groups, create and manage security printers, install printers, share resources, and assign permissions to those resources.
Database administrator is responsible for programming and maintaining a large multi-relational database in a networked environment and facilitating direct access to the database by individuals on the network.
Workgroup manager is responsible for problem-solving, implementing standards and solutions, reviewing performance, facilitating the efficiency of a specific group of individuals who are connected, as a group, to larger network environment. Support staff is responsible for technical assistance to the system administrator in large, complex network environments. Provides routine problem-solving and spot training to end-users.
Maintenance contractor is responsible for hardware repairs and upgrades; often this position is filled by contracting with a third-party service provider of with the vender. Webmaster or Web site administrator is responsible for implementing and maintaining the content and style of the company's Internet site, keeping the information accurate, up-to-date, and interesting.