RFC 1350 TFTP Revision 2 July 1992 one. Host A sends a "WRQ" to host B with supply= A's TID, location= sixty nine. 2. Host B sends a "ACK" (with block variety= 0) to host A with source= B's TID, destination= A's TID. At this time the link has become https://www.youtube.com/watch?v=QnjWGNZUQBE