Discovery & Monitoring Troubleshooting Capstone

Bundle lab · $29.99

Advanced discovery and monitoring capstone, run as a fault hunt. The NMS has stopped seeing this site: neighbours are missing from the topology map, no traps are arriving, and syslog went quiet — while every device is reachable and pingable. You get symptoms and the required end state — no fault list. Faults span both routers and the switch they all peer through, and more than one of them leaves the monitoring configuration looking complete.

Learning objectives

• Diagnose a monitoring outage from operational state alone, with no list of what was changed
• Check discovery on the device in the middle before concluding the endpoints are at fault
• Recognise per-interface suppression of a protocol that is still enabled globally
• Know that a trap destination configured with an undefined community sends nothing anybody will accept
• Repair faults across a switch and two routers

Troubleshooting focus

• Symptom-driven diagnosis: No logs received by NMS often indicates wrong destination IP, transport reachability, or disabled logging/trap generation.
• Differentiate configuration-state problems (deterministic) from runtime-state absence (e.g., show cdp neighbors) that is not graded.