Definition
Network traffic monitoring is the process of observing and analyzing data packets as they travel across a computer network. It involves capturing, inspecting, and logging network communication to gain visibility into data flow and identify potential issues. This practice is essential for maintaining network health, detecting security threats, and optimizing performance by understanding how devices and users interact. For instance, administrators can use monitoring tools to spot unusual data volumes or unauthorized access attempts in real time. Unlike network scanning, which actively probes systems, monitoring passively observes existing traffic without initiating connections. Understanding network traffic monitoring is crucial for IT professionals and is frequently tested on certifications like CompTIA Security+, CySA+, and CISSP.