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Parameter that is normally achieved through a trailer added to end of frame is ___________

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Parameter that is normally achieved through a trailer added to end of frame is ___________

(a) Access Control

(b) Flow Control

(c) Error Control

(d) Physical addressing

I got this question in semester exam.

This intriguing question originated from TCP over Wireless in portion Network Protocol of Wireless/Mobile

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Right choice is (c) Error Control

Explanation: The data link layer adds reliability to the physical layer by adding mechanisms to detect and retransmit damaged or lost frames. It also uses a mechanism to recognize duplicate frames. Error control is normally achieved through a trailer added to the end of the frame.

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