根据图上给出信息制作教学视频---Here is the extracted content from the image: **Chapter 1.** **① "nuts and bolts" view** **internet** - ① Network Edge (host, server, PC.) - ② Core (packet switch, Router,) -> Store and Forwarding - ③ Communication Link - Wired: fiber, - Wireless: radio (radio) **② Delay** 1. transmission delay > X 2. Propagation delay > X 3. Processing -> check error, output interface 4. queuing -> wait to transmit.

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