The term network monitoring describes the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator (via email, pager or other alarms) in case of outages. 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.
For example, to determine the status of a webserver, monitoring software may periodically send an HTTP request to fetch a page. For email servers, a test message might be sent through SMTP and retrieved by IMAP or POP3.
sometime it shows failure such as when a connection cannot be established, it times-out, or the document or message cannot be retrieved – usually produce an action from the monitoring system. These actions vary — an alarm may be sent (via SMS, email, etc.) to the residentsysadmin, automatic failover systems may be activated to remove the troubled server from duty until it can be repaired.
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