What layer of the OSI model is responsible for the representation of data, including encryption?

The Presentation layer of the OSI model is responsible for the representation of data, including tasks such as data translation, data encryption, and compression. This layer ensures that the data sent from the Application layer of one system can be understood by the Application layer of another system, regardless of differences in data formats or syntax used by the two applications.

For example, if one application outputs data in a specific format or language and the receiving application understands it in a different format, the Presentation layer performs the necessary conversions to facilitate this interoperability. Additionally, when it comes to encryption, the Presentation layer plays a crucial role by encoding data to enhance security during transmission.

Other layers, like the Transport or Session layers, have different responsibilities related to data transmission, session management, and ensuring reliable communication rather than formatting or representing the data itself. Therefore, the correct answer rightly identifies the Presentation layer as the layer focused on data representation and encryption within the OSI model.