After downloading a file, you find that it does not match the MD5 checksum provided. Downloading the file again gives the same incorrect checksum. What have you done wrong and how would you fix it?

What will be an ideal response?

When a downloaded file does not match the provided MD5 checksum, it
indicates the transfer did not work properly, possibly due to a network
error. It is highly unlikely that a network error would yield a file with the
same incorrect checksum twice. If downloading the file again yields the
same incorrect checksum, it suggests that you should look for a problem
other than a network error. Assuming that the MD5 checksum is correct,
the problem was likely caused by a transfer mode error.
ASCII files are rarely presented with an MD5 checksum; you can assume
that a binary file is being transferred. When you transfer a binary file in
ASCII mode, FTP changes the bytes that correspond to ASCII line endings.
FTP performs exactly the same conversion each time you transfer the file,
yielding the same incorrect MD5 checksum.
You can try to fix the transferred file with the todos utility. If that measure
fails, download the file again using a binary mode transfer.