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Ever increasing development in variouse sciences , make the
designeres of omputer communications , throwghout the world , to be
cnserned about this matter , that anable them to use the lastest
communication technology of the variouse computer networks , so then
, such variations to be done with the least cost and the possible
shortest time. In the case of nowadays , the computer networks ,
have changed the crucial part of the organizations , and have a
basic role of transmission of information . Never the less , the
idea of the creation of computernetworks is still known as a new
matter , and they always look at it as a very complicated and
technical phenomenon . The other problems that make the
organizations to have a network , are the necessitous to perform
administrative outomation systems , on the scale of an organization
and more so , over the departments of an organization , so , that ,
besides the administrative mechanization of systems , it will make
the functions easy , both to the users and or to the clients , and
these kind of systems indead are not
performed , unless on the bases of oppropariate bed environment .
According to networks are usually engaged with development and
variations whether phisially or logically , therefore in designation
of network , the ppropariate bed designation to be such performed ,
so that it could be able to ansewer the needs of managers and users
in short and long run terms .
Performece and supports of computer networks , if the agents are
correctly chosen , is not compelex , but it needs enovgh skills and
experiences .
The most difficulties that the existing networks are involved with ,
relates to the agents of designation . Designation is the most
important part of the network . So the performed network for the
achievement of the goals already schemed ,must be designed with
grate carefullness. In most cases the definition of asuccessful
network is the abilitity of computeres in interchanging of programs
and data , but satisfaction of oppropariate efficiency , capable
confidence and capable development are important matters , that are
usually hidden . We are in believe that in provided designs and
proposed equipments the total structure and the capability of
development have been under considration and , also fiscaly is
economical .
As far as the local network (LAN) and wide (WAN) and medium
wide(MAN)nowadays have reached the world of computer , so much is ,
day by day the needs for widening the strip will increase , and more
complex application and sensitive to the time (time sensitve), such
as sound and picture as normall softwares on the desk of computer
fans , will increase the traffic of network to the most . As the
technology of Ethernet in computer network is advancing , at the
time being majority of existing computer networks in the world are
using this technology . The particular of Ethernet is the capability
of using the various speeds , such as : (10,100,1000m.b) in a wide
body of an adanced network , that high speeds of this communicative
protocol in the distribution , back bone partision and low speeds in
Access partision can be used .
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