200-901 Infrastructure and Automation Practice Question
This 200-901 practice question tests your understanding of infrastructure and automation. 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 engineer is implementing Infrastructure as Code (IaC) for network devices. Which of the following practices is most critical to ensure that the environment state matches the desired configuration defined in code?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensuring that the automation tool is idempotent.
Idempotency ensures that applying the same configuration multiple times always results in the same desired state, regardless of the current state of the device. This is the most critical practice for IaC because it prevents configuration drift and guarantees that the environment state matches the code-defined configuration. Without idempotency, repeated runs of the automation tool could introduce unintended changes or fail to correct deviations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Using Jinja2 templates to generate device configurations.
Why it's wrong here
Templates help generate config but don't ensure idempotency.
✓
Ensuring that the automation tool is idempotent.
Why this is correct
Idempotency guarantees consistent state.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using version control for all configuration files.
Why it's wrong here
Version control helps track changes but doesn't ensure state matching.
✗
Implementing rollback procedures for failed deployments.
Why it's wrong here
Rollback is recovery, not state matching.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the concept that idempotency is the core principle of IaC for state convergence, tempting candidates to choose version control or rollback procedures because they are familiar best practices, but they do not directly ensure the environment state matches the code.
Detailed technical explanation
How to think about this question
Idempotency in network automation tools like Ansible or NAPALM is achieved by using 'check mode' or 'stateful' modules that compare the current device running-config (e.g., via show running-config or NETCONF <get-config>) against the desired config before applying changes. For example, an idempotent Ansible ios_config module will only push a line if it is missing, avoiding unnecessary CLI commands that could cause service disruption. In real-world scenarios, non-idempotent scripts can lead to duplicate ACL entries or interface configurations, causing network outages that are hard to debug.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensuring that the automation tool is idempotent. — Idempotency ensures that applying the same configuration multiple times always results in the same desired state, regardless of the current state of the device. This is the most critical practice for IaC because it prevents configuration drift and guarantees that the environment state matches the code-defined configuration. Without idempotency, repeated runs of the automation tool could introduce unintended changes or fail to correct deviations.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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