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Layer
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OSI
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UNIX
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Application
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Manages Communications between applications
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Ultimately responsible for managing the communications between applications.
- Application such as Telnet, FTP, etc
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Presentation
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Add structure to units of data being exchanged
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Provide a common representation of application layer data. Basically responsible for adding structures to the units of data that are exchanged.
- XDR (eXternal Data Representation)
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Session
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Adds control mechanisms to data exchange
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Provides the management and data flow control services.
- RPC (Remote Procedure Call)
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Transport
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Establish, maintain, and release transport connections
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Responsible for the reliability and multiplexing of data transfer across the network to the level provided by the application.
- TCP (Transmission Control Protocol) RFC 793
- UDP (User Datagram Protocol) RFC 768
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Network
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Connections between network hardware
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Responsible for the data transfer across the network, independent of both the media comprising the underlying sub- networks and topology of those sub-networks.
- IP (Internet Protocol) RFC 791, 894
- ARP (Address Resolution Protocol) RFC 286
- RARP (Reverse Address Resolution Protocol)
- ICMP (Internet Control Message Protocol) RFC 826
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Link
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Physical transfer of data
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Responsible for the transmission, framing and error control over a single communications link.
- Ethernet IEEE 802.3
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Physical
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Physical propriety
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Responsible for the mechanical and electrical interface to the communications media.
- Ethernet IEEE 802.2
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