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today were going to take a look at some common network ports and what their default purpose is so this is going to be some useful knowledge that really any it or network person should know but these are also things that you would need to know if youre studying for say a network plus a security plus or ccna exam so port 20 and 21 are going to be used by the file transfer protocol this is one of the most common protocols for file transfers thus the name port 20 is used for the actual data transfer and port 21 is the control port used for establishing a connection between the two computers theres authentication thats built into ftp so you should configure it with a username and password whenever possible and there is also default logins that are on a lot of systems like an anonymous user and its generally best practice to disable those as well any accounts that arent going to be used by the organization should be turned off port 22 is ssh if youve ever wondered how administrators a
