Since I'm not a major, I think I vaguely learned the operating principles of the convenient things around the router, torrent, and VPN. As a non-major web developer, I had to set up the network in the internal network at my first company, so at the time, I didn't go because I thought, "Why should I do this?" But even if I did, it would have been a fun experience! Thank you. I'll come back again when I find a vague concept.