Which of the following ports will you scan to search for SNMP enabled devices in the network?

Port 163 is not assigned to SNMP; it is unrelated to network management protocols.

Port 123 is the well-known port for NTP (Network Time Protocol), not SNMP.

Port 151 has no standard IANA assignment relevant to SNMP or network management.

SNMP uses UDP port 161 as the well-known port on which agents listen for Get, GetNext, GetBulk, and Set requests from a network management station. Scanning for open UDP port 161 is the standard method to identify SNMP-capable devices on a network. Port 162 is the companion trap port used for unsolicited agent-to-manager notifications.