Architecture Network Model OSI

Model OSI ( Open System Interconnection) have been developed by Organization Standardization for international ( ISO) as model of computer communications architecture and as framework for the development of standard of protocol, consist of seven layer, that is :

1) Application
2) Prersentation
3) Session
4) Transport
5) Network
6) Datalink

7) Physical

To facilitate how a data emit a stream of in a[n certain network, earn you see Gbr.1.1A pda where that represent simple model of transmission system of source to destination. While at Gbr.1.1B represent architecture model of OSI developed by ISO. Beside model OSI, in fact there is also other model which developed by a[n organization, for example IETF which tend to developing many standard of TCP / ip. One of [the] document which have been made by IETF that is RCFS ( Requests For Comments) and ITU-T which tend to to develop toward telecommunications and have many devisi which is each devisi have area of research certain. Following boldness from each layers of model of OSI :
Application
Functioning to provide to access to environment of OSI by user as well as providing distribution information

Presentation
Functioning to provide independency for the process of application of difference of data format sintaks

Session
Functioning to provide structure of control communications [among/between] and application of terminate connection ( session) between application with

Transport
Functioning for the reliability of and transfer of antar-end points, mengorerksi mistake of data, and arrange data stream

Network
Functioning for the upper of layer with independency of data transmission and technology of switching used by system for berkoneksi having duty for the establishing of, maintaining, and connection terminating.

Data of Link
Functioning to the transfer of information data at physical [relation/link] like sending data, data block, and others

Physical
This relate to physical like equipments of equipments for communications to take example others computer,hub,router,kabel,etc.

Model OSI with seven layer in fact can be divided to become two part of category that is layer upper and of lower layer.
Layer Upper generally relate to application which [is] implementation in software. While functioning layer lower to handle data of transport.