First lecture of computer networks. Let's shove all of these abbreviations with their meaning, and possibly a associated port number in one 1.5 hour lecture:

HTTP, HTTPS, FTP, FTPS, SFTP, TCP, IP, UDP, ISP, DSL, DNS, LAN, WLAN, WDM, P2P, TELNET, PGP, TLS, SSL, SSH, MIME, SMTP, POP3, IMAP, IANA, DHT, RTT, DHCP

I really feel sorry for students who didn't have previous knowledge about this stuff..