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As others have indicated, not all protocols involve ASCII text.
They may be binary, in which case anything other than text strings will look like gibberish. A lot of protocols are binary.
They may be text in some form of "extended ASCII" (including UTF-8), in which case some of it will look like ASCII text but non-ASCII characters will look like gibberish; if it's text in a language that doesn't use the Roman alphabet (Greek, languages using the Cyrillic alphabet, languages using the Hebrew or Arabic alphabet, Chinese, Japanese, Korean, etc., etc., etc.), it'll look like gibberish in ASCII, but you can change the ASCII display to another encoding.
They may be text in UTF-16, which will probably have bits that look like ASCII characters with single symbols between them, and other parts that look like gibberish. You can change the ASCII display to UTF-16.
They may be text in EBCDIC, which will probably look like gibberish. You can change the ASCII display to EBCDIC.
