These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.
Start Scenario PracticeA developer is troubleshooting a Cisco RESTCONF API call that returns a 409 Conflict error. Which two scenarios could cause this? (Choose two.)
Explanation: Option B is correct because RESTCONF returns HTTP 409 Conflict when the server cannot complete the request due to a conflict with the resource's current state, such as attempting to delete a resource that is still referenced or in use by another object. Option C is correct because a 409 Conflict is also returned when a client attempts to create a resource that already exists, violating the uniqueness constraint of the target data node. Option A is incorrect because a missing authentication token produces HTTP 401 Unauthorized (or 403 Forbidden), not 409. Option D is incorrect because a nonexistent resource yields HTTP 404 Not Found. Option E is incorrect because invalid data types trigger HTTP 400 Bad Request due to schema or validation failure.
A developer runs 'docker run -d -p 8080:80 --name web nginx:alpine'. The container fails to start. Which command is the most appropriate to investigate the issue?
Explanation: `docker logs -f web` streams the container's stdout and stderr output, which typically contains the error message explaining why the container failed to start (e.g., port conflict, missing configuration, or process crash). Since the container is not running, `docker logs` is the primary diagnostic tool to retrieve its exit logs without requiring the container to be active.
An engineer is troubleshooting a NETCONF session that fails to establish with a Cisco IOS XE device. The SSH connection succeeds, but NETCONF capabilities are not exchanged. What is the most likely cause?
Explanation: NETCONF uses a client-server model where the server (the Cisco IOS XE device) must have the NETCONF server explicitly enabled. If the SSH transport succeeds but capabilities are not exchanged, it indicates the NETCONF subsystem is not active on the device. The `netconf-yang` feature must be enabled via `netconf-yang` in global configuration mode to start the NETCONF server and allow capability exchange.
A developer has created a Webex Teams bot that listens for messages in a specific room and responds with information from an external database. The bot uses the Webex API's 'messages.create' method to post replies. During testing, the bot sometimes fails to respond, but no errors are logged. The developer checks the Webex Developer Portal and sees that the bot's rate limit is set to 10 requests per second. The bot's average load is 5 requests per second, but occasionally spikes to 15 requests per second for a few seconds. The developer wants to ensure the bot functions reliably without exceeding rate limits. Which approach should the developer implement?
Explanation: Implementing a request queue that limits outgoing requests to 10 per second and uses exponential backoff on failure ensures the bot respects the Webex API rate limit of 10 requests per second. The queue smooths out spikes (e.g., 15 req/s) by buffering excess requests, while exponential backoff handles any HTTP 429 responses gracefully by retrying after increasing delays, preventing further rate limit violations. This approach directly addresses the bot's intermittent failure without relying on external support or sacrificing functionality.
A developer is troubleshooting an HTTP API call that returns a 404 status code. Which of the following is the most likely cause?
Explanation: HTTP 404 Not Found is a client-side error indicating the server could not find the requested resource at the specified URL. The most likely cause is that the endpoint path is incorrect, misspelled, removed, or not mapped to any route on the server. The server itself is reachable and processed the request, but no matching resource exists, which is precisely what 404 signifies.
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Practice all Troubleshooting Scenario QuestionsThese questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure. These appear throughout the 200-901 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 200-901. Practicing each scenario type ensures you're ready for any format.
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