A key feature of the monitoring systems is theAlerting subsystem.

Thanks to it you can immediately notify IT managers of what is going on and activate the appropriate troubleshooting actions .

In the absence of an Alerting system IT administrators will be notified by the complaints of its customers who rip their clothes off because they cannot receive email or because they have to enter an order in a system that is not currently online .

A fundamental characteristic of a modern monitoring system is the Alerting subsistem.

Thank to it an alerting message on devices, systems or applications fault can be sent.
Traditional monitoring platforms are using a Reactive event handling system that as soon as the monitored item works in a wrong way is able to send a message to the IT administrator through the available channels.
This is a huge step forward compared to the lack of a system of this kind, before it's adoption customers called the IT department complaining about a malfuncioning, now the monitoring system warn in real time IT administrators and when the customer calls the IT department (maybe) the problem is still solved.
Of course, now it all depends on the speed with which the system administrators are able to solve the problem!

SNMP (Simple Network Management Protocol) belongs to the suite of protocols defined by the IETF (Internet Engineering Task Force) in 1989 and operates at layer 7 of the OSI model. This protocol allows network administrators to measure of network devices operating parameters in order to do anomalies detection or statistics creation.

How does it work

To operate the SNMP requires three elements, the managed system, the agent and the manager.
The managed system can be a router, a printer, a switch, or any other device that has an administrative agent that measure and stores data in a hierarchical database called MIB (Management Information Base).

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