You are using an open source packet analyzer called Wireshark and are sifting through the various
conversations to see if anything appears to be out of order.
You are observing a UDP conversation between a host and a router. It was a file transfer between the two on
port 69. What protocol was used here to conduct the file transfer?

A.
TFTP

B.
SFTP

C.
FTP

D.
SCP

Explanation:
TFTP is a simple protocol for transferring files, implemented on top of the UDP/IP protocols using well-known
port number 69.
Incorrect Answers:
B: SFTP runs over an SSH session, usually on TCP port 22.
C: FTP uses port 21, not port 69.
D: SCP is a variant of BSD rcp utility that transfers files over SSH session. SSH uses port 22, not port 69.

https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol