As a network security beginner I stumbled across a question which I think I have the answer to but I need an expert to give me better insight. The question is..what if an administrator was to(stupidly) change the port number of a FTP port from 21 to 23. As you know 23 happens to be the port number for Telnet. My question is..would this only make FTP impossible or would this also make Telnetting impossible since there would now be two ports with the number 23 (the original Telnet port and the port which was changed from 21 to 23), which in my opinion would inhibit the data transfer process.
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