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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