Which port is used by SNMP?

Which port is used by SNMP?

• A. 2049
• B. 512
• C. 8080
• D. 161

Answer: (D)

SNMP traffic uses UDP and has a standard port for normal management communication. The manager sends requests to the agent on UDP port 161, and responses follow on that same port. If the agent needs to alert the manager with a trap, it uses UDP port 162 to deliver that message. Because port 161 is the default for regular SNMP operations, it’s the port most commonly associated with SNMP. The other ports listed correspond to different services (for example, 2049 is NFS, 8080 is a common alternative HTTP port), so they aren’t used for SNMP.

SNMP traffic uses UDP and has a standard port for normal management communication. The manager sends requests to the agent on UDP port 161, and responses follow on that same port. If the agent needs to alert the manager with a trap, it uses UDP port 162 to deliver that message. Because port 161 is the default for regular SNMP operations, it’s the port most commonly associated with SNMP. The other ports listed correspond to different services (for example, 2049 is NFS, 8080 is a common alternative HTTP port), so they aren’t used for SNMP.