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Presentation Layer - Sixth Layer in OSI Reference Model

Presentation Layer is the sixth layer in Open Systems Interconnection (OSI) Reference Model. The presentation layer is responsible for how data is presented to the user. Presentation of various forms of information like graphics, text, audio, video etc in various forms to the user is the major duty of this layer. Data encryption is also one of the functions of the presentation layer to ensure data security. The presentation layer is working as the intermediate between the Application layer and Session layer in OSI Reference Model.

How Information is Presented in the Presentation layer

Text information is presented in either ASCII or EBCDIC form to the user. In the case of graphical information, we can see various standards to present it to the user. Some examples are JPEG, BMP, GIF etc.

Functions of Presentation Layer

Three functions of the presentation layer are:

  1. Encryption and Decryption
  2. Compression
  3. Translation

As we can see the presentation layer is responsible for data encryption and decryption. Forms of data presentation by presentation layer are in ASCII and EBCDIC.

Sub-layers in Presentation Layer

The Presentation Layer is composed of two sub-layers. They are:

  1. Common Application Service Element (CASE)
  2. Specific Application Service Element (SASE)

Presentation Layer Protocols

Major protocols in presentation layer are:

  1. Remote Desktop Protocol
  2. ASCII
  3. Network Data Representation
  4. External Data Representation

Further Reading

  1. Physical layer

  2. Data link layer

  3. Network layer

  4. Transport layer

  5. Session layer

  6. Presentation layer

  7. Application layer

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Alex George has Engineering graduation in Computer Science and an MBA in Finance. He had been working as a senior Network Engineer for ten years. His specialization is in Cisco products. Traveling is one of his hobbies and visited various places as part of his onsite work. He visited different places as part of his onsite work like New York, Dubai, London, etc. Right now Alex is a director of one of the leading career development firms in India, which trains students for UPSC, SSC, and PSC examinations. He guides a lot of students to get selection for various prestigious institutions like CBI, Income Tax Department, etc. Alex George is a stock market investor and a very active intraday trader. Engineering Background: He has a B.Tech in Computer Science and Engineering and passed different network and security courses like CCNA, CCNP (Security), CEH, and various Microsoft certifications. Finance Background: Alex has an MBA in Finance. He is an active intraday trader and a Share Market Investor. Webmaster Skills: Alex is a blogger since 2004. He has a working knowledge of HTML, CSS, PHP, and JavaScrip.