Thanks for that. That's what happens when slides get built at 0230 in the morning. /rWhile playing Kahoot it was accidently said that port 23/tcp was SMTP -- SMTP is 25/tcp. 23/TCP is Telnet.
When not taking an exam -- https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
(I just really wanted you to know someone was watching and paying attention)