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NIELIT 2016 DEC Scientist B (IT) - Section B: 49

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Option D

 

Application layer deals with the user interface, what message is to be sent or the message format, syntax and semantics. A user has access to application layer for sending and receiving messages.
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The data unit created at the application layer is called a message.

So all types of tasks are performed on message during Application layer.

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Application layer protocol defines:

  1. types of messages exchanged
  2. rules for when and how processes send and respond to messages
  3. message format, syntax and semantics

 

THEREFORE

OPTION D

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