The current ordering is incorrect. The correct answers are:
FTP uses ports 20 and 21 over TCP by default and is more reliable for loading IOS images
TFTP uses port 69 and UDP by default and does not require user credentials
TFTP is aptly named for being trivial to configure and use. It is less reliable and you may often see failures or bad hashes when loading files or images instead of using FTP.
FTP: PROVIDE REALIBILITY, PORT 20 21, TCP
TFTP: DOESN'T AUTHEN, PORT 69, UDP
FTP: - PORT 20 :create connect to client, receive request client
- PORT 21: transfer data to client
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