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Which of the following tasks is not done by data link layer?

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Which of the following tasks is not done by data link layer?

(a) framing

(b) error control

(c) flow control

(d) channel coding

I have been asked this question by my college professor while I was bunking the class.

This intriguing question originated from Data Link Layer topic in portion OSI Model of Computer Network

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Right option is (d) channel coding

The best I can explain: Channel coding is the function of physical layer. Data link layer mainly deals with framing, error control and flow control. Data link layer is the layer where the packets are encapsulated into frames.

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