Hub, sometimes referred to as a concentrator or repeater Hub,
refers to a networking
component which acts as a convergence point of a Network,
allowing the transfer of data packets.
In its simplest form, a hub works by duplicating the data packets
received via one Port,
and making it available to all ports, therefore allowing data sharing
between all devices connected to the hub.
A networknetworknetwork serverserverserver
is a computer
that provides various shared resources to workstations and other
servers on a computer networknetworknetwork.
The shared resources can include disk space, hardware access, and email services. Any
computer can be a “networknetworknetwork serverserverserver.”
What separates a serverserverserver from a
workstation is not the hardware, but rather the function performed by
the computer. In general, a workstation is any computer used by an
individual person to perform his or her job duties, while a networknetworknetwork
serverserverserver
is any computer that provides users with access to shared software or
hardware resources.
A (network) hub is an information distribution device. It has network ports (cheap ones for home use normally have four to eight ports, devices for professional use offer 16 or more). Network data received on any of the ports is simply forwarded to all other ports. A network hub is therefore a rather simple device that allows computers to communicate with each others or to other devices like networked printers.
More sophisticated devices analyze the network data and forward it only to ports where the data is actually needed, see "switches" and "routers".
A server is a dedicated computer or similar device of comparable complexity that can be contacted by other computers to provide some remote service. For example, a web server sends back web pages on request, a print server provides connectivity to printers, a file server remote file data storage, a database server allows access to a relational database. There are many more examples.
For example, if you enter "http://www.fixya.com" into the address line of your browser, your computer sends a request to a DNS server (usually a machine at your internet service provider's site) to resolve the symbolic name "www.fixya.com" to a numeric internet address (IP). Using this information, the web server with the symbolic name "www.fixya.com" is requested to provide you with the home page of FixYa. The home page may contain references to other web servers and your computer contacts all of them to gather all the information to finally render the web page on your browser.
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