https://selectel.ru/blog/courses/network-protocols/
    https://selectel.ru/blog/osi-for-beginners/

2023
https://habr.com/ru/companies/selectel/articles/776896/
    ! list of courses
2022
BogdanStashchuk - Udemy - The World of Computer Networking. Your CCNA starts here (2022) WEB-DL [EN / EN Sub]
    magnet:?xt=urn:btih:495aed4ddd97df882fa73edc9fcfdf4bdb302a39
    https://nnmclub.to/forum/viewtopic.php?t=1550687
    ! 15.96g, cool, using mac and wireshark, number systems conversion samples
2021
Nerds - Networking
    https://www.youtube.com/playlist?list=PL7T06JEc5PF5B5Zgx44kEZW-B0fX41kwZ
    ! UniversityOfWashington, Google, Microsoft
PowerCertAnimationVideos - Information Technology
    https://www.youtube.com/playlist?list=PL7zRJGi6nMRzHkyXpGZJg3KfRSCrF15Jg
2020
MIPT - Klimanov - Computer Networks of 15
    https://www.youtube.com/playlist?list=PLthfp5exSWEp5OGCCuPGu7Rj-SkTSKMv4
Sozykin - Protected Network Protocols ru of 12
    https://www.youtube.com/playlist?list=PLtPJ9lKvJ4oiFnWCsVRElorOLt69YDEnv
2019
Sozykin - Computer Network Practices of 22
    https://www.youtube.com/playlist?list=PLtPJ9lKvJ4oiKPQ9GXOvntj44Eu8IGAJK
Sozykin - Advanced Computer Networks of 10
    https://www.youtube.com/playlist?list=PLtPJ9lKvJ4oh_w4_jtRnKE11aqeRldCFI
Sozykin - Computer Networks of 56
    https://www.youtube.com/playlist?list=PLtPJ9lKvJ4oiNMvYbOzCmWy6cRzYAh9B1
    https://www.asozykin.ru/courses/networks_online
2018
Udemy - The Complete Networking Fundamentals Course. Your CCNA start
    https://freecoursesite.com/the-complete-networking-fundamentals-course-your-ccna-start-27/
    magnet:?xt=urn:btih:6e9b4b6e0271cbffc3fd9758bc5bc061f666c6e9
    ! 8.95g, gns-based, so-so
2017
Antonow - Net
https://www.youtube.com/playlist?list=PLeYxjiX1MAInVJK8_3VEzBVmvPSARL9cB
https://www.asozykin.ru/courses/networks_online
https://www.youtube.com/playlist?list=PLtPJ9lKvJ4oiNMvYbOzCmWy6cRzYAh9B1
2015
Bachilo - Network Technologies
    https://www.youtube.com/playlist?list=PL5FMLPRj1j6IChoB7nBKYNjCNQ-DBnaq7

intuit
https://www.youtube.com/user/Intuitube
http://www.intuit.ru/studies/courses/3688/930/info
https://www.youtube.com/playlist?list=PLDrmKwRSNx7IX9zmmGbviuX-ZZaDmhhwU
http://www.intuit.ru/studies/courses/524/380/info
https://www.youtube.com/playlist?list=PLDrmKwRSNx7KKEd9ig8rRUquMm5SJ2lM9
http://www.intuit.ru/studies/courses/489/345/info
https://www.youtube.com/playlist?list=PLDrmKwRSNx7KtPpeB5EFk0XlbhodREKFC

Linux Network means:
http://www.intuit.ru/studies/courses/681/537/info

  http://www.intuit.ru/studies/courses/37/37/lecture/1106
http://www.intuit.ru/studies/courses/2/2/info