Have you ever thought about how your computer talks with others on a network? Would you like to listen to, or "sniff", the conversation? Network engineers, system administrators, security professionals and, unfortunately, crackers have long used a tool that allows them to do exactly that. This nifty utility, known as a sniffer, can be found in the arsenal of every network guru, where it's likely used everyday for a variety of tasks. This article will offer a brief overview of sniffers, including what they do, how they work, why users need to be aware of them, and what users can do to protect themselves against the illegitimate use of sniffers.
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