OSI Layer 7 -
Application Layer
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The last 3 layers
of the OSI model are reffered to the "Upper" layers.
These layers are responsible for applications
communicating between hosts. None of the upper layers
know anything about networking or network addresses.
FTP, TFTP,
Telnet, SMTP and other protocols work on the first three
layers of the OSI model, which obviously includes the
Application layer. |
Layer 7- The Application Layer
The Application layer of the
OSI
model is where users communicate with the computer. The
Application layer is responsible for identifying and
establishing the availability of the intended
communication partner and determining if sufficient
resources for the intended communication exist. The user
interfaces with the computer at the application layer.
Although
computer applications sometimes require only desktop
resources, applications may unite communicating
components from more than one network application, for
example, file transfers, e-mail, remote access, network
management activities, client/server processes.
There are
various protocols which are used at this layer.
Definition of a"Protocol" is a set of rules by which two
computers communicate. In plain English, you can say
that a protocol is a language, for example, English. For
me to speak to you and make sense, I need to structure
my sentence in a "standard" way which you will
understand. Computer communication works pretty much the
same way. This is why we have so many different
protocols, each one for a specific task. |
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