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To achieve unnecessary control over data communication link
A logic is added above the physical interface which is referred as Data Link Control/ Protocol
To see the need of data link control, some of the requirements and objectives for data communication are listed as follows
Frame synchronization- start and end should be recognizable
Flow control- the sender and receiver data rate
Error control- check the error and correct it
Addressing- identify the address
Control and Data on same link- should have control information
Link Management- the initiation, maintenance and termination
We will study the three mechanisms that are a part of data link control
Flow control, error detection and error control
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