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
yes this correct! I googled it. https://docs.google.com/document/d/17gUz5IEKucMVh0SVpD_0GLTkZhZfKBWUBEAkiX9kjkE
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
Ref: Cisco IOS Cookbook, 2nd Edition (O’Reilly)
"...
Discussion
Several recipes in this chapter have shown how to transfer files between your router and server by using TFTP. However, Cisco routers also support FTP. We find that FTP is better suited for transferring files over busy and congested links. While TFTP file transfers tend to abort if they encounter persistent congestion, FTP appears to be more resilient.
FTP is also somewhat more secure than TFTP because it uses usernames and passwords. TFTP has no user-level security features.
..."
Ref: Difference between FTP and TFTP - GeeksforGeeks
"...
FTP stands for File Transfer Protocol.
...
FTP works on two ports: 20 and 21 One for data and another is for connection control.
TFTP stands for Trivial File Transfer Protocol.
...
TFTP works on 69 Port number and its service is provided by UDP.
..."
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