Network monitoring is the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator (via email, SMS or other alarms) in case of outages. It is part of network management.
While an intrusion detection system monitors a network for threats from the outside, a network monitoring system monitors the network for problems caused by overloaded and/or crashed servers, network connections or other devices.
Network monitoring tools allow organizations to baseline the network performance of their hardware and software infrastructure. With a baseline of nominal operations in hand, IT is positioned to recognize and respond to conditions that can negatively impact network performance and threaten the user community’s productivity and quality of experience.