ISO(International Standards
Organisation)
OSI(Open System Interconnect)
OSI is a model developed by ISO which describes how data from application on one computer can be transferred to an application on another computer.
OSI(Open System Interconnect)
OSI is a model developed by ISO which describes how data from application on one computer can be transferred to an application on another computer.
All People Seem To Need Data Processing.
(Application,Presentation,Session,Transport,Network,DataLink,
Physical Layers.)
(Application,Presentation,Session,Transport,Network,DataLink,
Physical Layers.)
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The Seven Layers of the OSI Model
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Layer
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Name
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Description
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1
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Physical
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Governs the layout
of cables and devices such as repeaters and hubs.
Eg:-Cables,
connectors, hubs, and repeaters
|
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2
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Data Link
|
Provides MAC
addresses to uniquely identify network nodes and a means for data to be sent
over the Physical layer in the form of packets. Bridges and switches are
layer 2 devices.
Eg:- MAC
address, CSMA/CD, switches, and bridges
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3
|
Network
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Handles routing of
data across network segments.
Eg:-IP, ICMP, ARP,
RIP, IGRP, and routers
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4
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Transport
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Breaks information
into segments and is responsible for connection and connectionless
communication.
Eg:-TCP and UDP
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5
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Session
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Establishes sessions
between network applications.
Eg:-NetBIOS
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6
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Presentation
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Formats the
information so that it is understood by the receiving system.
Eg:-Compression and
encryption depending on the implementation
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7
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Application
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Allows applications
to request network services.
Eg:-SMTP, DNS, HTTP,
and Telnet
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