Wireshark

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Wireshark tool can be used to packet sniffing and we can get the data stream which are sending via FTP, Telnet since FTP and Telnet are not using encryption when sending data. When we using wireshark, we can filter the packets by protocol and the data packet is containing which is sent. They are containing sequentially and FTP or Telnet is not secure enough to send sensitive data.
  We can sniff SSH packets but we can not get the data as the data is encrypted.

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