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In the TCP/IP model, encryption and decryption are functions of ____ layer.

  1. data link
  2. network
  3. transport
  4. application
in Computer Networks by Veteran (424k points)
edited by | 172 views
–1
Application layer
+1
Application layer.

1 Answer

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Both Encryption and decryption are based on the content of messages used for communications.


ENCRYPTION is the process of encoding a message so that only authorized entities are allowed to have access to the contents of the message. It converts a plaintext( original message) to ciphertext( encrypted message) using an encryption key and encryption algorithm.

Thus it means that ENCRYPTION WORKS WITH CONTENTS OF MESSAGE. 

ENCRYPTION IS A FUNCTION OF APPLICATION LAYER [ APPLICATION LAYER IS LAYER WHOSE PROTOCOL DATA UNIT IS MESSAGE].


DECRYPTION is reverse process of ENCRYPTION. It converts a ciphertext( encrypted message) to plaintext( original message) using an decryption key and decryption algorithm.

Thus it means that DECRYPTION ALSO WORKS WITH CONTENTS OF MESSAGE. 

Thus, DECRYPTION IS A FUNCTION OF APPLICATION LAYER.


Hence, both encryption and decryption are functions of application layer.

Therefore, answer is OPTION 4.


PROTOCOL DATA UNIT of a layer is the term used to describe the unit of data transferred from one end to another end or vice-versa in that layer. The PDU of various layers in TCP/IP protocol suite is shown in the table below:

LAYERS PDU
PHYSICAL LAYER BITS
DATA LINK LAYER FRAMES
NETWORK LAYER PACKETS/ DATAGRAMS

TRANSPORT LAYER

SEGMENTS/ DATAGRAMS

APPLICATION LAYER MESSAGE

 

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