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Sniffer may refer to:

Packet Sniffing attacks ● Many organizations LANs are Ethernet networks. ● In Ethernet networks, any machine on the network can see traffic for each machine that is within the network. ● A sniffer program exploits these features, monitor all traffic and capture the first 128 bytes (relatively) of each unencrypted FTP or Telnet session (the part that contains the user's password).