CompTIA Server+

Answer - C - By default, SNMP uses port 161.

Key Takeaway: Simple Network Management Protocol, or SNMP, is a UDP-based network protocol used in network management systems to monitor network-attached devices. It uses a set of standards for network management, including an application layer protocol, a database schema, and a set of data objects. It operates in the Application Layer of OSI models and uses UDP ports 161 for the agent and 162.