Compaq 222863-001 TaskSmart W2200 Administration Guide - Page 121

International Standards Organization Reference Model for Open Systems Interconnection (ISO/OSI)

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Glossary 7 International Standards Organization Reference Model for Open Systems Interconnection (ISO/OSI) An architectural model developed by the ISO for the design of an open systems network. This model divides the complex problem of communications into several simpler functions or layers and defines standards for each of the layers. Layer 7 Application Layer: provides application services (for example, file transfer) and is the home of operating systems and some software applications. Layer 6 Presentation Layer: restructures data into required format (for example, ASCII to EBCDIC). This layer also formats screens and handles graphics. Layer 5 Session Layer: assembles physical messages into logical messages (for example, APPC, NetBIOS), and allows two applications to communicate across the network. Layer 4 Transport Layer: manages end-to-end data transfer and error correction. Similar to the Data Link layer in function, but operates on local hardware. Layer 3 Network Layer: determines the physical path on which the data is transferred and routed to, based on network conditions and priorities. Layer 2 Data Link Layer: manages physical transfer of data between nodes (for example, HDLC). This layer strings data together into messages and checks that all the data is there. See also MAC. Layer 1 Physical Layer: defines electrical and mechanical characteristics of the channel. (for example, RS-232-C, Twisted-pair). Internet Protocol (IP) The IP in TCP/IP. A protocol designed to allow the host to inject packets into a network and have them travel separately to their destination (even if that destination is on a different network). IP See Internet Protocol.

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Glossary
7
International Standards Organization Reference
Model for Open Systems
Interconnection (ISO/OSI)
An architectural model developed by the ISO for the design of an open
systems network. This model divides the complex problem of communications
into several simpler functions or layers and defines standards for each of the
layers.
Layer 7
Application Layer: provides application services (for example, file
transfer) and is the home of operating systems and some software
applications.
Layer 6
Presentation Layer: restructures data into required format (for
example, ASCII to EBCDIC). This layer also formats screens and
handles graphics.
Layer 5
Session Layer: assembles physical messages into logical messages
(for example, APPC, NetBIOS), and allows two applications to
communicate across the network.
Layer 4
Transport Layer: manages end-to-end data transfer and error
correction. Similar to the Data Link layer in function, but operates
on local hardware.
Layer 3
Network Layer: determines the physical path on which the data is
transferred and routed to, based on network conditions and
priorities.
Layer 2
Data Link Layer: manages physical transfer of data between nodes
(for example, HDLC). This layer strings data together into messages
and checks that all the data is there.
See also
MAC.
Layer 1
Physical Layer: defines electrical and mechanical characteristics of
the channel. (for example, RS-232-C, Twisted-pair).
Internet Protocol (IP)
The IP in TCP/IP. A protocol designed to allow the host to inject packets into
a network and have them travel separately to their destination (even if that
destination is on a different network).
IP
See
Internet Protocol.