Exam N10-009 topic 1 question 46 discussion

The correct answer is: A. Presentation The Presentation layer (Layer 6) of the OSI model is responsible for functions like data formatting, translation, and encryption/decryption. End-to-end encryption is typically handled at this layer to ensure that data is securely encoded before being transmitted and properly decoded upon receipt.

A. Presentation

This is my answer, but please correct me if I'm wrong. True end-to-end encryption (E2EE) typically operates at the application layer (Layer 7) of the OSI model. This is because E2EE is designed to encrypt data from the time it leaves the sender's application until it is decrypted by the recipient's application, ensuring that it remains secure throughout its journey. Application Layer (Layer 7): This is where E2EE protocols, such as Signal Protocol, OpenPGP, and various proprietary methods used in messaging apps, work. They ensure that the data is encrypted and decrypted only by the end-users' applications. The transport layer (Layer 4), which includes protocols like TLS, does provide encryption, but it doesn't always maintain encryption throughout the entire path between sender and receiver, since data may be decrypted at intermediate points.

Presentation Layer responsible for end-to-end encryption

D, The transport layer is responsible for end-to-end encryption using protocols such as TLS.