Docstoc

Networks

Document Sample
Networks Powered By Docstoc
					                      NETWORKS
WHAT IS A NETWORK?                    NETWORK PRINTERS

LAN & WAN NETWORKS                    NETWORK SECURITY


 WHAT IS A FILE SERVER?

Click on the button      to find information on these headings.



 To return to this slide, click on the Home button
A network is a system that sends
and receives data and messages
enabling two or more computers to
communicate with each other.


Networks typically allow computers
to share files, share printers and
send messages to each other.
A network contained within one building or
site is called a Local Area Network (LAN).
A network that spans several sites across a
city, country or even the world is called a
Wide Area Network (WAN).
A Client/Server network may be a LAN or
WAN, however a peer-to-peer network can
only be a LAN. What is a Client/Server
network?
The most famous and widely used Wide
Area Network is the Internet which contains
many thousands of servers and many
millions of clients right across the world.
File servers store the files that are created
by the network users. They also store
applications such as word processing
programs, spreadsheets etc.


Users can access parts of a file server's
hard disk which will appear as an extra
drive on their own computer. Applications
can either be run from the fileserver, or
they can be downloaded to the user's
workstation.


In addition, the fileserver often runs the
network software which controls the
network.
Most school networks use a
laser printer.
Laser Printers use a laser beam
and dry powdered ink to produce
a fine dot matrix pattern. This
method of printing can generate
about 4 pages of A4 paper per
minute.
The standard of print is very good and
laser printers can also produce very
good quality printed graphic images
too.
 Network Security



Networks store their files centrally on a file server.
This makes it much easier to maintain security than
with a large number of stand-alone computers with
the files saved on their own hard disks.
Security is maintained by ensuring that users have
login names and passwords and are restricted to
files and directories for which they have clearance.
One important aspect of security is the regular
backing-up of important files. This can easily be
done when files are centrally stored.
Client/server networks
                           There are several types of
consist of two kinds of    servers, for example file servers
computer. The clients      which store and distribute files
are usually computer       and applications, and print
workstations sitting on    servers which control printers.
the desks of employees
in an organisation. The    Client/Server networks need
servers are usually        client software which is installed
more powerful              on the workstations and in
computers and are held     addition, they also need server
in a central location or   software such as Windows NT®
locations within an        Server or Novell Netware®.
organisation.              Click here to see an example
A Computer Network




    Computer          Server
     Room




                     Laptops

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:0
posted:5/18/2012
language:English
pages:8
fanzhongqing fanzhongqing http://
About