Wireshark is the world’s foremost network protocol analyzer, and is the de facto standard across many industries and educational institutions.
Wireshark supports the tcpdump standard format and it can rebuild TCP sessions and its graphic interface is very intuitive.
When deploying Wireshark on your computer, you can choose the plugins and extensions you want to install, such as the Dissector plugin, Tree Statistics, SNMP MIBs, or the Meta Analysis and Tracing Engine.
Wireshark is a highly specialized tool that the average user won’t find much use for but for any network administrators out there, it’s an essential addition to your toolkit.
The only flaw of Wireshark is it has a weak built-in Help system for easy utilization and learning.