I had read about TCP in layer 4 where sequence number and acknowledgment numbers were assigned to each segment so that each side of the connection could keep track of the process of sending/receiving bytes. However, now I read about the LLC field in the frame which is added to it in layer 2, and it is stated that it also assigns those two numbers, my question is:
- How do these two differ from each other?
- Is one an "alternative" for the other? in that case, where is it specified which one is being used?
Again if the answer to previous question is yes, assuming that I decide to take the TCP layer approach, how would be the LLC field filled?
Thanks in advance.