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From this post we know that

There are two common modes for transferring files via FTP, ascii and binary

It is about media connection. But also there is a control connection, which has some info like IP addresses and so on.
Does the info inside control connection have binary or textual format?

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  • Have you researched the relevant RFCs which define the FTP protocol?
    – user1686
    Mar 24, 2020 at 21:05
  • @user1686 I'm currently researching it but can't still figure out things.
    – z0lupka
    Mar 24, 2020 at 21:05
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    Short answer: text
    – DavidPostill
    Mar 24, 2020 at 21:07
  • @DavidPostill Thank you so much!
    – z0lupka
    Mar 24, 2020 at 21:09

1 Answer 1

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The FTP control connection is text. It's mostly 4-character all-caps command mnemonics and occasional IP addresses (in dotted-decimal ASCII) and port numbers (in ASCII numerals). And of course path and file names in text.

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  • 1
    It's not just that it's text – but it's also specifically defined to be NVT-ASCII text with CRLF line endings, so it's exactly the same as "ASCII" data transfer mode.
    – user1686
    Mar 25, 2020 at 8:25

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