In this post, I'll help you understand what a packet sniffer is and how it can be used in a Man-in-the-Middle (MITM) attack known as ARP poisoning. They know that an attacker armed with a packet sniffer can easily obtain usernames and passwords just by sniffing an FTP connection. That's why people who craft regulations like PCI DSS are wary of it. Sadly, this well-loved technology is not very secure. The File Transfer Protocol allows users to transmit volumes of files over the Internet through uncomplicated FTP clients, some of which are already built-in in the two popular operating systems, Windows and Mac OS X. A lot of people who often send files just love FTP.
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