What is a common tool used for monitoring network performance?

A Network Management System is specifically designed to monitor and manage network resources, ensuring their optimal performance. This tool provides insights into various aspects of the network, such as bandwidth usage, latency, packet loss, and the overall health of network devices. It enables network administrators to identify potential issues before they escalate, troubleshoot network problems, and ensure that the network meets performance expectations.

In contrast, a Database Management System focuses on handling databases and managing data storage, a Content Management System is centered around the creation and management of digital content, and Project Management Software is used for planning, executing, and monitoring projects across various domains but does not provide specialized network monitoring capabilities. Thus, the choice of a Network Management System aligns perfectly with the need to monitor network performance effectively.