Data security, data compression, and which other service are provided by the Presentation Layer?

The Presentation Layer is a crucial component of the OSI model responsible for transforming and preparing data for the application layer. One of its primary functions is to ensure that data is presented in a usable format for the application, meaning that it handles data representation. This includes translating data between the format that the application can understand and the format that can be transmitted over the network.

Data representation encompasses several aspects, such as character encoding (like ASCII or UTF-8), data type conversion, and data serialization. By fulfilling these roles, the Presentation Layer allows different systems with potentially varying data formats to communicate and interact effectively.

While data security can involve elements like encryption, and data compression is about reducing the size of data for transmission, the specific function of transforming how data is represented for efficient processing is a hallmark of the Presentation Layer's role. Thus, highlighting data representation as the additional service provided alongside data security and data compression accurately reflects the responsibilities of this layer in the OSI model.