Cisco Certified Support Technician (CCST) NetworkingIP ServicesHard
A network monitoring system is configured to send SNMP traps to a network administrator's workstation whenever a critical event occurs on a managed device. Which UDP port must the administrator's workstation be listening on to receive these traps?
- A162
- B161
- C123
- D514
Show answer & explanationAnswer & explanation
Correct answer: A. 162
SNMP uses two primary UDP ports: 161 for requests (GET, GETNEXT, SET) sent to the agent and 162 for traps and informs sent from the agent to the manager. The administrator's workstation acts as the SNMP manager and must listen on port 162 to receive traps.
Why the other options are wrong
- B. Port 161 is used by SNMP agents to receive requests from the manager.
- C. Port 123 is used by NTP.
- D. Port 514 is used by Syslog.
SNMP Trap Port
The default UDP port used by an SNMP manager to receive unsolicited alert messages (traps) from SNMP agents on managed devices.
- UDP Port 162 is for receiving traps.
- UDP Port 161 is for sending requests to agents.
- Traps are asynchronous notifications of events.
Memory trick: 161 for Requests, 162 for Traps – order matters!