Quick Answer
The answer is service reconciliation using FastMap, the Cisco NSO feature designed for configuration compliance. FastMap works by comparing the intended service model, defined in YANG, against the actual device configuration, then performing a diff and re-applying the service logic to correct any deviations, ensuring continuous compliance with corporate standards. On the Cisco DevNet Associate 200-901 exam, this concept tests your understanding of NSO’s lifecycle management and how automation enforces policy, often appearing in scenario-based questions where a team must detect and fix configuration drift. A common trap is confusing FastMap with simple sync-from or sync-to operations—remember that FastMap actively reconciles by running the service template, not just copying configs. Memory tip: think “FastMap fixes drift” to recall its role in compliance enforcement.
This 200-901 practice question tests your understanding of cisco platforms and development. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A DevOps team is using Cisco NSO to manage network devices. They want to ensure that the configuration is compliant with corporate standards. Which NSO feature should they use?
Configuration Snapshots
Why wrong: Snapshots are for backup, not compliance checking.
NETCONF notifications
Why wrong: Notifications are for event monitoring.
Configuration Database (CDB) rollback
Why wrong: CDB rollback is for reverting changes.
Service reconciliation using FastMap
FastMap reconciles device config with service model to ensure compliance.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service reconciliation using FastMap
Service reconciliation using FastMap is the correct NSO feature for ensuring configuration compliance with corporate standards because it detects and corrects deviations between the intended service model (defined in YANG) and the actual device configuration. FastMap performs a diff and re-applies the service logic to bring the device back into compliance, making it ideal for continuous compliance enforcement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Configuration Snapshots
Why it's wrong here
Snapshots are for backup, not compliance checking.
NETCONF notifications
Why it's wrong here
Notifications are for event monitoring.
Configuration Database (CDB) rollback
Why it's wrong here
CDB rollback is for reverting changes.
Service reconciliation using FastMap
Why this is correct
FastMap reconciles device config with service model to ensure compliance.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between passive monitoring features (snapshots, notifications, rollback) and active remediation (FastMap), leading candidates to pick a feature that only detects drift rather than one that corrects it.
Detailed technical explanation
FastMap works by comparing the current device configuration against the service's intended state stored in NSO's CDB. When a discrepancy is found, FastMap generates a minimal set of NETCONF edit-config operations to reconcile the device, leveraging NSO's transaction manager and service lifecycle hooks. In real-world scenarios, FastMap is often triggered via a periodic compliance check script or a CI/CD pipeline to automatically fix drift caused by manual CLI changes or out-of-band modifications.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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Cisco Platforms and Development — study guide chapter
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FAQ
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
The correct answer is: Service reconciliation using FastMap — Service reconciliation using FastMap is the correct NSO feature for ensuring configuration compliance with corporate standards because it detects and corrects deviations between the intended service model (defined in YANG) and the actual device configuration. FastMap performs a diff and re-applies the service logic to bring the device back into compliance, making it ideal for continuous compliance enforcement.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.
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