Which of the following ports should a network technician open on a firewall to back up the configuration and operating system files of a router to a remote server using the FASTEST method possible?
A. UDP port 22
B. TCP port 22
C. TCP port 25
D. UDP port 53
E. UDP port 69
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TFTP is a simple protocol for transferring files, implemented on top of the UDP/IP protocols using well-known port number 69.