Port 161 supports SNMP and snmp (TCP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
Queries and management operations for SNMP agents.
Monitoring network devices, servers, power systems and appliances.
Client to server
Prefer SNMPv3 authentication and privacy. Restrict managers by source and never expose community-based SNMP publicly.
snmp (TCP reference coverage) is documented as a network service convention for port 161 over TCP.
Use this reference entry when identifying or validating systems documented to use 161/TCP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.