Wireshark is an open-source tool for analyzing network traffic. It captures packets in real time and displays them with detailed protocol information. In an ISMS context, Wireshark is used for troubleshooting, security analysis, and forensic investigation. You can use it to detect unencrypted data transmissions or identify suspicious communication patterns. Since Wireshark itself represents a powerful monitoring capability, its use should be regulated and logged within the ISMS.