Presentation and Application Layer
The Presentation Layer is important for ensuring that data is presented to the Application Layer in a format that is understandable and usable by the receiving application. It provides the necessary data formatting, encryption and decryption, compression, and translation services to ensure that data is transmitted securely and efficiently over the network.
The Application Layer is critical for providing network services to end-users. It provides a variety of services, including network virtual terminal, file transfer, email, directory services, network management, and distributed database services. These services allow users to access resources on the network and interact with other users and systems.