title: How to find out whether the packet transferred over UDP is lost or dropped?
body: <p>I am new to networking. I have a small doubt.
  I am sending an alarm using SNMP to a target, but the alarm is not received at the target within the specified amount of time. I feel that the data may be lost or dropped.</p>
  
  <p>Now my question is : on what basis should I conclude that there is a loss or drop?
  Or will there be any other reason for the trap not to be received?</p>