Which layer of the OSI model is responsible for data encryption and decryption?

Which layer of the OSI model is responsible for data encryption and decryption?

• A. The Application layer
• B. The Transport layer
• C. The Presentation layer
• D. The Network layer

Answer: (C)

The Presentation layer of the OSI model plays a critical role in the handling of data formatting, encryption, and decryption. This layer is specifically designed to manage how data is presented to the Application layer, ensuring that it is in a usable format for the applications that require it. In terms of encryption and decryption, the Presentation layer provides necessary services to convert data into a secure form before transmission and to revert it back into its original form upon receipt. This includes processes such as data compression and the translation of data formats, as well as security measures like encryption protocols (such as SSL/TLS) which protect sensitive information during transfer across the network. Layers above the Presentation layer, like the Application layer, may utilize these services but do not perform encryption and decryption directly. Similarly, the Transport layer focuses on reliable data transfer and flow control, and the Network layer is concerned with routing and addressing data through the network. Therefore, the Presentation layer is the correct choice as it directly handles the processes related to data encryption and decryption.

The Presentation layer of the OSI model plays a critical role in the handling of data formatting, encryption, and decryption. This layer is specifically designed to manage how data is presented to the Application layer, ensuring that it is in a usable format for the applications that require it.

In terms of encryption and decryption, the Presentation layer provides necessary services to convert data into a secure form before transmission and to revert it back into its original form upon receipt. This includes processes such as data compression and the translation of data formats, as well as security measures like encryption protocols (such as SSL/TLS) which protect sensitive information during transfer across the network.

Layers above the Presentation layer, like the Application layer, may utilize these services but do not perform encryption and decryption directly. Similarly, the Transport layer focuses on reliable data transfer and flow control, and the Network layer is concerned with routing and addressing data through the network. Therefore, the Presentation layer is the correct choice as it directly handles the processes related to data encryption and decryption.