Medium Access Control (MAC) protocols 

Sir Your explanations are so well and precise.You are a life saver

I absolutly enjoyed listing your explanation. Every simple and also on point. Thank you

18:41 Solution: Add extra waiting time after channel becomes clear, to account for time delay. Assume that at some distance D between node 2 and node 4, node 2's transmission will no longer REACH node 4, and therefore at that distance D node 4 doesn't need to wait for node 2. The extra time delay depends on link quality.

Very well presented

Thank you so much, you make learning enjoyable.

Short lecture but Everything which explained is clear :D Thank you

2:38 Unclear. If a channel can support X bps, then anytime anyone broadcasts on that channel, they can broadcast at X bps. Right?

27:47 What if two nodes try to grab the token at the same time?