CompTIA Network+ (N10-009)Networking ConceptsMedium
A network engineer is configuring a monitoring server to receive unsolicited SNMP trap messages from network devices. Which UDP port should the server listen on?
- A161
- B162
- C514
- D389
Show answer & explanationAnswer & explanation
Correct answer: B. 162
SNMP traps are sent from managed devices to the management station on UDP port 162. Port 161 is used for the management station to query devices (GET/SET requests), not to receive traps.
Why the other options are wrong
- A. Port 161 is used for SNMP GET/SET queries sent to agents, not traps.
- C. Port 514 is used by syslog, not SNMP traps.
- D. Port 389 is used by LDAP, unrelated to SNMP.
SNMP Ports
SNMP uses UDP port 161 for manager-to-agent queries and UDP port 162 for agent-to-manager trap notifications.
- SNMP is used for network device monitoring and management
- Traps are unsolicited alerts sent by devices
- SNMPv3 adds authentication and encryption
Memory trick: 161 asks, 162 alerts