Which protocol is associated with port 161?

Port 161 is specifically associated with the Simple Network Management Protocol (SNMP). This protocol is primarily used for network management, allowing devices such as routers, switches, and servers to communicate management information. SNMP operates by using a client-server model where management systems (the clients) can gather data from agents (the servers) on network devices.

SNMP enables monitoring of network performance, as well as configuration changes and event logging. Utilizing port 161, it allows for the transmission of messages to and from managed devices effectively. This is particularly important for network administrators who need to ensure that their infrastructure operates smoothly and any issues can be identified and resolved quickly.

In contrast, the other protocols listed are associated with different ports: HTTP typically uses port 80, DNS operates on port 53, and FTP usually utilizes ports 20 and 21. These differing uses highlight the specific purpose and function of port 161 in the context of network management.