A tool commonly used for monitoring network performance is Wireshark, a packet analysis software. Wireshark captures and analyzes the data packets transmitted over a network in real-time, providing insights into network traffic, performance bottlenecks, and potential security vulnerabilities. Network analysts utilize Wireshark to troubleshoot connectivity issues, monitor bandwidth usage, and examine protocol interactions. Its detailed reports and visualization capabilities help IT teams optimize network performance and enhance overall network security by identifying abnormal patterns or unauthorized access attempts, ensuring reliable connectivity.