TFTP supports five types of packets, all of which have been mentioned above:
1 - Read request (RRQ)
2 - Write request (WRQ)
3 - Data (DATA)
4 - Acknowledgment (ACK)
5 - Error (ERROR), which can contain the following error messages:
0 - Not defined, see error message (if any).
1 - File not found.
2 - Access violation.
3 - Disk full or allocation exceeded.
4 - Illegal TFTP operation.
5 - Unknown transfer ID.
6 - File already exists.
7 - No such user.
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