A network engineer is implementing SNMP telemetry across an enterprise routing infrastructure. The network management system (NMS) must perform scheduled status polling while also receiving confirmed alerts for critical interface state changes. Which TWO statements correctly describe the operational mechanisms and transport ports used by SNMP in this environment?
- SNMP Informs require the receiving network management station to return an explicit Response PDU to the agent over UDP port 162 to acknowledge delivery.Answer
- BSNMP Traps achieve reliable delivery by establishing a connection over TCP port 162, which handles frame sequencing and retransmissions.
- SNMP polling requests, such as GetRequest and SetRequest, are transmitted by the NMS to the managed device agent listening on UDP port 161.Answer
- DSNMP agent polling operations sent from the NMS to query device MIB objects are directed to UDP destination port 162 on the managed router.
Answer
The correct statements are that SNMP Informs require the receiving network management station to return an explicit Response PDU to the agent over UDP port 162, and that SNMP polling requests (such as GetRequest and SetRequest) are transmitted by the NMS to the managed device agent listening on UDP port 161.
The statements confirming that SNMP Informs demand an explicit Response PDU acknowledgement over UDP port 162 and that NMS polling requests target UDP port 161 on managed agents are technically accurate. SNMP agents listen for incoming requests on UDP port 161. When asynchronous events occur, agents send Traps or Informs to the NMS on UDP port 162. While Traps are unacknowledged, Informs mandate a Response PDU back from the NMS to confirm receipt.
Step-by-Step Solution
Key Concept
SNMP Transport Ports and Trap vs. Inform Mechanics