In computer system networking, the layered principle of networking was occurred to accommodate alters in technology. Every layer that a certain network model may be responsible because that a different function of the network. Each layer will certainly pass information up and also down come the next subsequent layer together data is processed.

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The OSI (Open mechanism Interconnection) Network model Standard

The OSI network version layers are arranged right here from the lower levels beginning with the physical (hardware) to the greater levels.

The 7 class of OSI


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Physical Layer

An application that communicates v other computers that synchronizes to the application"s communication service.

Data link Layer

It specifies how to move data on a single link

Network Layer

This layer defines the end-to-end packet transport, which defines the logical addresses that determine all nodes and likewise defines just how the routes are implemented and also how they are learned.

Transport Layer

The functions of this layer include whether to pick the error recovery protocol or the error-free restore protocol, and also multiplex the input of different application data streams ~ above the same host, and additionally include the role of reordering received packets that space not in the correct sequence.

Session Layer

It specifies how come start, control and also end a session, including the control and management of multiple bidirectional messages so the applications deserve to be notified when just a part of a consistent message has actually been completed, so that the data watched by the presentation great is contiguous, In part cases, if the presentation layer has received every one of the data, the data to represent the presentation layer.

Presentation Layer

The main role of this layer is to specify the data format and encryption.

Application Layer

An application that communicates through other computers that synchronizes to the application"s interaction service.

What is presentation layer?

The presentation class is located at the 6th level of the OSI model, that is responsible for the delivery and also formatting of details to the applications layer for further processing or display. This type of company is needed due to the fact that different computer system architectures use different data representations. In contrast to providing transparent data move at the 5th level, the presentation layer handle all concerns related come data presentation and also transport, consisting of translation, encryption, and also compression.


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Presentation great functions

The actual functions of the presentation layer incorporate the adhering to aspects:

Network security and confidentiality management, text compression and packaging, online terminal protocol (VTP).Syntax switch - The summary syntax is convert to the deliver syntax, and also the other side to accomplish the the opposite conversion (transfer syntax will certainly be convert to summary syntax). Associated in the contents of the code conversion, character conversion, data format modification, and data structure operation adaptation, data compression, encryption and so on.Grammar negotiation - according to the demands of the applications layer come negotiate the appropriate choice of context, that is, to recognize the infection syntax and transmission.Connection management - including the use of the conference layer business to establish a connection, regulate data transport and also synchronization regulate over this connection (using the corresponding services in ~ the session level), and terminate the connection either normally or absently.

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Presentation great of OSI model

It has occurred a collection of standards such as DP8822, DP8823, DIS6937 / 2 because that service, agreement, text communication symbol. The presentation layer acts together a translator between the application and the network, mainly addressing the syntax representation of user information, ie, giving formatted representations and also translation data services. Data compression, decompression, encryption, decryption are completed in this layer.

Presentation class protocols

Other protocols sometimes thought about at this level (though maybe not strictly adhering come the OSI model) include:

Apple submit Protocol (AFP)Independent Computing architecture (ICA), the Citrix device core protocolLightweight Presentation Protocol (LPP)NetWare main point Protocol (NCP)Network Data depiction (NDR)Telnet (a remote terminal accessibility protocol)Tox, The Tox protocol is periodically regarded as component of both the presentation and application layereXternal Data representation (XDR)25 Packet Assembler/Disassembler Protocol (PAD)