Implementing Client Server Communication Model
The
client–server characteristic describes
the relationship of
co-operating programs in
an application. The server
component provides a
function or service
to one or
many clients, which
initiate requests for such services.
The model assigns
one of two
roles to the
computers in a
network: Client or
server. A server
is a computer
system that selectively
shares its resources;
a client is
a computer or
computer program that
initiates contact with a server
in order to
make use of
a resource. Data,
CPUs, printers, and
data storage devices
are some examples
of resources.
This sharing of
computer resources is
called time-sharing, because
it allows multiple
applications to use the computer's
resources at the
same time.Clients and
servers exchange messages
in a request-response messaging
pattern: The client
sends a request,
and the server
returns a response.
To communicate, the
computers must have
a common language,
and they must
follow rules so
that both the
client and the server know
what to expect.
The language and
rules of communication
are defined in
a communications protocol.
All client-server protocols
operate in the
application layer.
Whether a
computer is a
client, a server,
or both, it
can serve multiple
functions. For example,
a single computer
can run web
server and file
server software at the same
time to serve
different data to
clients making different
kinds of requests.
Client software can also
communicate with server
software on the same computer.
Communication between servers,
such as to
synchronize data, is
sometimes called inter-server or
server-to-server communication.
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