Memory tips for common well-known port numbers

ftp:21 telnet:23 smtp:25 dns:53 tftp:69 http:80

The numbers themselves are bland, but as the most commonly used protocols, it is important to know their port numbers, which can be assisted by a digital coding system.

21: Crocodile
23: Monk
25: Erhu
53: Wushamao
69: Cooking Wine
80: Paris Tower

FTP (File Transfer Protocol, using TCP): Upload a crocodile (21) via FTP protocol, the crocodile is too big, stuck in the line, can't move.

Telnet (Telnet protocol, using TCP): Small Monk (23) live in the mountains, inconvenience down the way by remote login operation.

SMTP: Want to find the post office to send a parcel, but was told not to guarantee the package of erhu (25) is not damaged, or you have to add a sum of money as insurance.

DNS (Domain name resolution service, using UDP): Input Wushamao (. com), how can not parse.

TFTP (small file Transfer Protocol, using UDP): The recipe for cooking wine and then use TFTP to send me, do not use FTP, I need to quickly get it.

HTTP:80, too familiar, don't make up the story.