What is network protocol ?

A network protocol is an established set of rules that determine how data is transmitted between different devices in the same network. Essentially, it allows connected devices to communicate with each other, regardless of any differences in their internal processes, structure, or design.

What is wireshark ?

Wireshark is a GUI network protocol analyzer. It lets you interactively browse packet data from a live network or from a previously saved capture file. Wireshark's native capture file format is pcapng format, or pcap which is also the format used by tcpdump and various other tools.

Wireshark can also be used to intercept and analyze encrypted TLS traffic. Symmetric session keys are stored in the browser, and with the appropriate browser setting (and permission and knowledge of the user) an administrator can load those session keys into Wireshark and examine unencrypted web traffic. Wireshark comes with graphical tools to visualize the statistics. This makes it easy to spot general trends, and to present findings to less-technical management. This is a practical course, so you will explore more.