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Which layer is responsible for translation, encryption and compression of data?


Network layer

2. Application layer
3. Data-link layer
4. Transport layer
5. Presentation layer

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Correct Answer - Option 5 : Presentation layer

The correct answer is the Presentation layer.

  • Presentation layer: The presentation layer is the sixth layer of the OSI model. The presentation layer allows you to define the form in which the data is exchanged between the two communicating entities. This layer is responsible for the translation, encryption, and compression of data. This layer transforms data into the form which is accepted by the application. This layer is also known as a syntax layer.
  • The Open Systems Interconnection (OSI) Model is a logical and conceptual model that defines network communication used by systems open to interconnection and communication with other systems. There are seven OSI layers. They are the Application layer, Presentation layer, Session layer, Transport layer, Network layer, Data-link layer, and Physical layer.

  • Network layer: The network layer is the third layer of the OSI model and provides the functional and procedural means of transferring variable length data sequences from one node to another connected in different networks. The network layer also finds the best physical path for the data to reach its destination is known as routing.
  • Application layer: The application layer is the topmost and seventh layer of the OSI model. The application layer is the only layer that directly interacts with data from the user end. The application layer interacts with software applications to implement a communicating component. 
  • Data-link layer: Data link layer is the second layer of the OSI model and corrects errors that can occur at the physical layer. The layer allows you to define the protocol to establish and terminates a connection between two connected network devices. It helps you to define the best path, which allows you to take data from the source to the destination.
    • The data link layer is subdivided into two types of sub-layers:
      • Media Access Control (MAC) layer is responsible for controlling how devices in a network gain access to medium and permit to transmit data.
      • The logical link control layer is responsible for identity and encapsulating network-layer protocols and allows you to find the error.
  • Transport layer: The transport layer is the fourth layer of the OSI model and builds on the network layer to provide data transport from a process on a source machine to a process on a destination machine. It helps ensure that data units are delivered error-free and in sequence. The transport layer helps you to control the reliability of a link through flow control, error control, and segmentation or de-segmentation.

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