The pdf of client server model has too many repetition.

Hi Abhijeet!

Thanks for reaching out and providing feedback.
We've noticed that students tend to prefer longer rather than shorter explanations of certain topics. Since the client-server model comes along as a relatively theoretical concept compared to the rest of the content in this course, we thought it would be worth repeating the matter a few times.
Nevertheless, we are happy to take your feedback into account and would consider re-organizing this lecture should more people find difficulty in understanding this particular part of the content.

Hope this helps.
Kind regards,
Martin