12-10-2012, 05:47 PM
Basics of Networking
KS_5th_NetworkingBasicsKevinShea.ppt (Size: 1.13 MB / Downloads: 40)
Networking began its infancy in the mid -1960’s.
by the US Department of Defence (DoD).
The original intention of networking was being
developed to withstand a nuclear war.
Telephone networks were to vulnerable and would
terminate all conversations should a nuclear war
occur.
At the time, IBM dominated the computer companies
and every was scared to death that IBM would use
its clout to force everyone to use SNA.
The OSI model became the world standard and was
not controlled by one company, but by a neutral
organization, ISO (International Standards Association).
THE PHYSICAL LAYER
The physical layer is concerned with transmitting
raw bits over a communication channel though
hubs, wires (cat5UTP), modems, network cards…
basically anything that is physical to the network.
In networking, computers are also known as
Hosts or Nodes.
THE DATA-LINK LAYER
You will also find smart devices such as switches in
the Data-Link Layer.
The digital information that needs to be sent such as
and e-mail, attachments, etc needs to be broken into
smaller bits known as packets.