Welcome to the 2nd Network plus 009 video series.In this video series, I would like to introduce you the OSI Ref model with a small story for better understanding.Once upon a time, there were two neighboring kingdoms: Kingdom AhmadShah Durani and Kingdom Bright. And separated by great distance.these two kingdoms wanted to communicate important messages, trade secrets, and maintain peace.However, sending messengers between them was a complicated task, as their methods of communication were different.So, they decided to establish a 7-layered system to ensure their messages could travel securely and be understood on both sides.