In this week I have learned
about History and the Underlying Technologies. Do you know what is Internet?
It is the largest network in
the world that connects hundreds of thousands of individual networks all over
the world. The popular term for the Internet is the “information highway”.
Rather than moving through geographical space, it moves your ideas and
information through cyberspace – the space of electronic movement of ideas and
information and No one owns it.
The underlying technologies
: 7 Layers of the OSI Model
OSI (Open System
Interconnection) Model consists of 7 layers:
Layer 1 (Physical): hardware
Layer 2 (Data Link):
handling errors of layer 1, flow
control, synchronisation
Layer 3 (Network): switching
and routing, logical paths, virtual circuits
Layer 4 (Transport):
end-to-end system services, ensures complete data transfer
Layer 5 (Session):
connections between applications
Layer 6 (Presentation):
independence from difference in representation (syntax layer)
Layer 7 (Application): end
user processes (telnet, ftp)
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