Jim Kurose's video lecture series on "Computer Networking, A top down approach". It follows the format of the book (same name). The video lectures are on youtube[1] and can be accessed from his web page[2] as well

The professor does an excellent job at explaining every detail, and the lectures end up being even fun. I've enjoyed this a lot.

[1] https://www.youtube.com/@JimKurose/videos [2] https://gaia.cs.umass.edu/kurose_ross/lectures.php