Encryption and Decryption is the responsibility of ______ layer.

Encryption and Decryption is the responsibility of the Presentation layer. Explanation: The Presentation layer is responsible for data formatting, compression, and encryption. It ensures that data sent from the application layer is in a format that can be read by the receiving application. This includes converting data into a common format and securing it through encryption before transmission. The Physical layer handles the transmission of raw bits over a medium and does not manage encryption. The Application layer provides user interfaces and network services but does not handle encryption directly. The Network layer manages routing and logical addressing, not data security. Therefore, the Presentation layer is the correct answer.