Network system

Network system

•What is an intranet and why is it used?

An intranet is a private, web-based service on a LAN. A large organisation uses it to provide information to its employees through familiar web-based tools, such as web browsers. It is used because only employees can access it.

•What is the difference between an intranet and the Internet?

An intranet is private and cannot be accessed by any member of the public, unlike the Internet which can be accessed by anyone through an ISP

network system uses network operating systems to allow two or more computers to perform processing independently while sharing controlled access to facilities such as file storage, servers and printers.

A network system requires:

•  networked devices, such as workstation or server computers, or network-enabled peripheral devices such as printers

•  metal cable, fibre-optic cable, wireless or satellite connections

•  sufficient copies of an appropriate network operating system.

Network topologies:

•A network can be connected in different patterns or topologies. Three basic network topologies are:

•The scale of networks may be:

•local (LAN) or single-site, typically using network cables, fibre-optic cables or wireless links

•  wide (WAN) or multiple-site, typically using telephone lines, fibre-optic cables or satellite links.

•The best-known WAN is the Internet. To distinguish them from public web services on the Internet, private web-based services on a LAN are known as an intranet. An externally accessible intranet is known as an extranet