In the TCP/IP model (not the OSI model), encryption and decryption are…
2019
In the TCP/IP model (not the OSI model), encryption and decryption are functions of the ____ layer.
- A.
data link
- B.
network
- C.
transport
- D.
application
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Correct answer: D
Correct answer: Application layer
Why presentation layer is not an option here: The OSI model has a separate Presentation layer, where encryption/decryption is commonly listed. The TCP/IP model does not have a separate Presentation layer.
In TCP/IP, presentation-type functions such as encryption, decryption, compression, and formatting are handled within the Application layer.
Transport layer mainly provides end-to-end transport functions such as reliability, sequencing, and multiplexing.
Network and data-link layers handle routing/addressing and local link transfer respectively; they are not the general answer for this TCP/IP layer question.
Therefore, the correct TCP/IP layer is the Application layer.
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