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What does the application layer handle?

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What does the application layer handle?

(a) Top-level communication

(b) Bottom-level communication

(c) Both Top-level and Bottom-level communication

(d) Middle-level communication

This question was addressed to me in an online quiz.

The doubt is from Performance Measures in JavaScript topic in portion Performance Measures in JavaScript of JavaScript

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Right option is (a) Top-level communication

The explanation is: An application layer is an abstraction layer that specifies the shared communications protocols and interface methods used by hosts in a communications network. The Application layer handles the top-level communication that the client and servers use, like HTTP and SMTP for email clients.

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