A network engineer configures SNMPv2c on a Cisco router to monitor CPU and memory utilization. The NMS is reachable and configured with the same community string 'public'. However, the NMS receives no traps from the router. The engineer verifies that the router's SNMP configuration includes 'snmp-server enable traps' and 'snmp-server host 192.168.1.100 version 2c public'. What is the most likely cause of the missing traps?

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