Data Link Control Additional Notes

8/17/2019 Data Link Control Additional Notes

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Sequence Numbers

• Frames from a sender are numberedsequentially.• We need to set a limit since we need toinclude the sequence number of each frame inthe header.• If the header of the frame allows m bits forsequence number, the sequence numbersrange from 0 to 2 m !. for m " #, sequencenumbers are$ !, 2, #, %, &, ', (.

• We can re)eat the sequence number.• Sequence numbers are$

0, !, 2, #, %, &, ', (, 0, !, 2, #, %, &,

', (, 0, !, *


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+- hae receied


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Documents

Data Link Control Additional Notes