UGC NET CSE | June 2012 | Part 2 | Question: 15

Question

Decryption and encryption of data are responsibility of which of the following layer?

• A. Physical layer
• B. Data link layer
• C. Presentation layer
• D. Session layer

Answer 1

Answer : Presentation layer

Encryption is typically done at Presentation layer. although it can be done on the application, session, transport, or network layers, each having its own advantages and disadvantages. Decryption is also handled at the presentation layer 

Reference : Decryption and encryption of data at Presentation layer

Answer 2

1. Presentation layer is mainly responsible for encryption and well as decryption but in OSI not in TCP
2. In TCP/IP ,Application layer is responsible for the encryption and decryption.

Comments

but in the question it is nothing mentioned about osi or tcp/ip

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But there’s no application layer

Answer 3

The session layer is responsible for dialog control (machines enter into a dialog, negotiating duplex mode, transmission speed etc) and synchronization (by using checkpoints).

The presentation layer is responsible for translation (convert whatever the message is — intergers, characters etc into bits, so both machines can understand), compression and encryption. //Mnemonic TCEP

So, Option C