A wireshark is a network sniffer tool. A   sniffer allows you to see the data   transmitted over the network to and from your   computer.
Wireshark will be discussed in depth in the below slide, For   now, we are going to see its basics usage and practical too and understand the   difference between clear-text and cryptographic protocols.
  Also read - Clear-text protocols and Cryptography 
We've gone over the basic theory -- now   let's put it into practice! In this task we're going to look at some captured   network traffic to see the advantages of understanding the OSI and TCP/IP   Models. Wireshark Capture Network  Traffic.
When you first   load the packet into Wireshark you're given a list of captured data in the top   window (there are two items in this window just now), and in the bottom two   windows you're shown the data contained in each captured packet of data:
Download   file -   PCAP FILE 
   
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