Sniffers (also known as network monitors) helps troubleshoot network problems.
A sniffer can be a self-contained software program or a hardware device with the appropriate software or firmware programming. Sniffers usually act as network probes or "snoops." They examine network traffic, making a copy of the data without redirecting or altering it.
Network-monitoring system usually consists of a PC with a NIC (running in promiscuous mode) and monitoring software.
References:
- http://compnetworking.about.com/od/networksecurityprivacy/g/bldef_sniffer.htm
- http://www.colasoft.com/resources/network-sniffer.php
- CompTIA Security+ Study Guide: Exam SY0-301, Fifth Edition by Emmett Dulaney
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