You want to use SNMP to detect when a link interface goes down or comes up. Would a request-response mode or a trap mode be appropriate for this? Explain your choice.
Try an answer before revealing the guidance below.
Key Concepts
- SNMP trap
- Event notification
- Polling
- Interface state
Answer Approach
- Identify who starts each SNMP exchange: manager or agent.
- Choose the mode that reports a change promptly.
- Compare event-driven notification with repeated polling.
Full Answer
Answer status: Draft answer (unofficial). Revision notes, not an official marking scheme.
A trap is appropriate: the device’s SNMP agent can notify the manager when an interface changes state without waiting for the next poll. Request-response polling can also detect a change, but only when the manager asks and with greater polling overhead.
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