A packet analyzer is used to monitor, intercept, and decode data packets as they are transmitted across different networks. They are also called packet sniffers,protocol analyzers and network analyzers. Packet analyzers can be either hardware or software. This means that packet analyzers could be physical equipment or be already set inside of the computers processor. Packet analyzers are used to help IT teams to monitor and filter network traffic.
Another function of packet analyzers is the fact that they can be used in the form of "attacks". These attacks can involve someone using a packet analyzer in a promiscuous way. These attacks allow hackers to access user log in, financial information and e-mail. These attacks are ways for hackers to gain important information that would never be seen by the public. People who use free wi-fi, such as hot spots, are at a high risk for these attacks. To avoid these attacks, users should use secure internet and put a password on all of their personal devices.
Source: http://www.veracode.com/security/packet-analyzer
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