NetAlarm supports SNMP protocol to control all snmp-enabled devices like network switches, routers, servers and some industrial machines.
Using snmp protocol, you can control your network switch's fan speed, cpu utilization, packet statictics, etc..

To use SNMP protocol, drag and drop an SNMPCheck component onto the designer. After that, double click the component and view the properties. Type your host name and add the query conditions. That is all.

Example
We want to control anonymous user count on our IIS Server agains to denial of service attacts and we want to get notified in case of high anonymous user count.

According to microsoft documentation, the OID .1.3.6.1.4.1.311.1.7.3.1.7.0 represents currentAnonymousUsers.
If you want to start a notification if anonymous user count is greater than 100, you can use the following query.

SNMP.Get('.1.3.6.1.4.1.311.1.7.3.1.7.0') > 100

And you can define this query as below.

The scenario we created above, controls your IIS server periodically. If anonymous user count exceeds our threshold value, an alarm will be triggered.