open systems interconnection (osi) supplemental material
TRANSCRIPT
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Open Systems Interconnection (OSI)
Supplemental Material
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Internetworking
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Open Systems Interconnection (OSI)
Developed by the International Organization for Standardization (ISO) in 1984
The primary architectural model for intercomputer communications.
A conceptual model composed of seven layers, each specifying particular network functions.
Describes how information from a software application in one computer moves through a network medium to a software application in another computer.
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OSI Model
Applicationlayer
Networklayer
Data Link layer
Physical layer
OSI Model F-D’s Model
Application layer: http, telnet, snmp,smtp, nfs, ftp
TCP, UDP
Data Link Layer
Physical layer
Internet Model
IPv4, IPv6
(HDLC)
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OSI Model
Network layer provides routing and related functions
Transport layer implements reliable internetwork data transport services
Session layer establishes, manages and terminates communication
sessions between presentation layer entities
Presentation layer provides a variety of coding and conversion functions
Application layer closest to the end user
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Protocols
Protocols fall into one of the following groups: LAN protocols WAN protocols Network protocols Routing protocols
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Interaction between Layers
A data link layer contact three other layers
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Headers and Data
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Physical-layer Implementation
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OSI Data Link Layer
IEEE has subdivided data link layer into two sub-layers.