Difference between SNMP monitors and Traps

Difference between SNMP monitors and Traps

SNMP Monitors
Pull Model: OpManager sends SNMP request to the SNMP agent running on the monitored device and receives the response.
Push Model: Monitored device(SNMP agent) sends messages in the form of traps to the trap destination(OpManager)
Communication: both ways(UDP 161)
One way. Only from device to trap destination (UDP 162)
SNMP requests can be scheduled using monitoring intervals.
Traps are spontaneous. They will reach the destination as soon as they are generated. 
Custom SNMP monitors can be created for the non default metrics. These monitors convert the raw SNMP response into a meaningful metric with unit.
Custom SNMP Trap processors are can be created for the new trap messages. They process the trap messages and convert them into meaningful alarms.
If there is no trap processor, traps will be dumped under Alarms-->Unsolicited traps.
SNMP community string is mandatory to get a SNMP response 
Community string is not mandatory to receive the trap message.

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