What is presentation layer of the OSI model? Functions of presentation layer

len Alfred Ajibola - 29th October, 2021 @ 07:51 AM

Topics in ICT

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Academic Questions in ICT

Please check out our Questions and Answers here

What is the first step towards disabling automatic image download on WhatsApp?

  • A. Click on the three dots on the top right hand corner

  • B. Click on the WhatsApp logo

  • C. Click on the settings icon on the top right corner

  • D. Click on the settings icon located on the to top-center of the app

  • E. Click directly on the storage and data icon located on the top right corner

  • F. Click on the mobile data usage icon located on the top right corner

The followings are ways to conserve data on android phones except _____.

  • A. Turning on data saving mode

  • B. Activating background apps

  • C. Use of Wi-Fi to update apps

  • D. Disable automatic image download on WhatsApp

  • E. Watch low resolution videos on youtube

  • F. Utilizing a reputable data saving app on google playstore

Twitter was launched in _____.

  • A. 2003

  • B. 2004

  • C. 2005

  • D. 2006

  • E. 2007

  • F. 2008


Presentation Layer:

The presentation layer is popularly referred to as layer 6 of the open systems interconnection (OSI) model. Without the presentation layer, you may not properly understand the writings on this article since it could have be written in a variety of languages and codes.

Before you could read this article via the application layer on your device (that is, through your web browser in this instance), this website's content arriving from the web server where it’s located must first be presented on your screen. If this article had been encrypted without any form of decryption from the server (for security reasons), then you probably would have seen an unreadable text, but all thanks to the presentation layer.

Please read on the application layer and its functions here.


From the above paragraph, the presentation layer therefore acts as an interpreter or a translator to the application layer. In this regard, it addresses the manner of syntax representation, formatting them and making them readable to end users.

Presentation layer - Lenacad

The presentation layer of the OSI model functions to translate, encode and decode data, encrypt and decrypt data, compress and decompress data, while also formatting text or images such as ASCII, EBCDIC, PNG, TIFF, GIF, PICT, JPG and so on.

You can read an introduction to the OSI model here.

The significance of the presentation layer is emphasized because different computer architectures may use different data representations such as ASCII and EBCDIC characters.


Below are some protocols that work at the presentation layer:

  • 25 Packet Assembler/Disassembler Protocol

  • Lightweight Presentation Protocol (LPP)

  • Independent Computing Architecture (ICA)

  • Apple Filing Protocol (AFP)

  • eXternal Data Representation (XDR)

  • Network Data Representation (NDR)

  • HyperText Transfer Protocol (HTTP) and HyperText Markup Language (HTML) agents

The presentation layer therefore presents readable data on your computer screen through the processes of translation, encoding, decoding, compression, decompression, encryption and decryption.

Please read on the transport layer of the OSI model here.

 

Functions of the presentation layer

  1. The presentation layer is responsible for interoperability between different encoding methods. Through this function, data is translated by layer 6.

  2. The presentation layer encrypts and decrypts data.

  3. The presentation layer compresses and decompresses data.

  4. The presentation layer formats data into readable text.

  5. The presentation layer encapsulates the components of data in order to enhance the user's interface.

  6. The presentation layer is responsible for the conversation of programming codes and characters, alongside data formatting and data structure.

  7. The presentation layer brings about the security and integrity of network with regards to the data going through it.

  8. In conjunction with the session layer, it assists in connection management.

  9. The presentation layer converts the abstract layer syntax into a transfer syntax and vice versa.

  10. The presentation layer aids in grammer negotiation by determining the transmission syntax.


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len

Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.



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NOTABLE POINTS IN ICT

Computer hardware is the collection of physical parts of a computer system.

Physical parts of a computer are those parts that you can see and touch. It may also be referred to as the 'equipment of the computer'.

When the computer case is opened (with a screwdriver), one would see the different hardware components inside of it. It's important to state that some other hardware components are present outside the computer case; and these are termed peripherals.

Below are hardware components seen inside the computer case:

  • Motherboard

  • Central Processing Unit (CPU)

  • Graphics Processing Unit (GPU)

  • Power supply Unit (PSU)

  • Northbridge

  • Southbridge

  • Peripheral Component Interconnect (PCI) slots

  • Network Interface Card (NIC)

  • Random Access Memory (RAM)

  • Ventilation fans

  • Heat sink

  • Hard Disc Drive (external present)
  • Solid State Drive (SSD)

  • CMOS battery

  • Optical Disc Drives (external present)

  • USB port, PS2 port, Ethernet port and other ports

  • Expansion Ports / Slots

Please read more on computer hardware here

Hardware components seen outside the computer case are called peripherals. The peripherals are grouped into the following:

  1. Input devices: They provide information to the computer.

  2. Output devices: Brings out information from the computer.

  3. Storage devices: They store information or data.

Below are examples of some peripherals:

  • Keyboard (input)

  • Monitor (output)

  • Mouse (input)

  • Webcam (input)

  • Touch Pad (input)

  • Universal Serial Bus (USB) flash drive or memory card (storage)

  • Hard disc drive (storage)

  • Stylus (input)

  • Joystick(input)

  • Printer (output)

  • Speaker (output)

  • Headphones (output)