200-901 Application Deployment and Security Practice Question
This 200-901 practice question tests your understanding of application deployment and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses GitLab CI to deploy a containerized application to a Kubernetes cluster. The deployment pipeline fails at the 'deploy' stage with an error: 'unable to connect to server'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The kubeconfig file for the cluster is missing or invalid.
The error 'unable to connect to server' indicates that the GitLab CI runner cannot establish a TCP connection to the Kubernetes API server. This is most commonly caused by a missing or invalid kubeconfig file, which contains the cluster endpoint, credentials, and context required by kubectl to authenticate and communicate with the cluster. Without a valid kubeconfig, the deployment stage cannot proceed.
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.
✗
The Git repository is private and cannot be accessed.
Why it's wrong here
Repository access is not related to Kubernetes cluster connectivity.
✓
The kubeconfig file for the cluster is missing or invalid.
Why this is correct
Without a valid kubeconfig, kubectl cannot connect to the cluster.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Docker image was not built successfully.
Why it's wrong here
An image build failure would be caught in the build stage, not the deploy stage.
✗
The Kubernetes cluster has insufficient resources to schedule the pod.
Why it's wrong here
Insufficient resources would cause a different error (e.g., 'pod pending' or 'unschedulable').
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between pipeline-stage-specific errors; the trap here is confusing a Kubernetes connectivity error (missing kubeconfig) with a resource scheduling issue (insufficient resources) or a build failure, which occur at different stages and produce distinct error messages.
Detailed technical explanation
How to think about this question
The kubeconfig file (typically ~/.kube/config) uses YAML to define clusters, users, and contexts, with the cluster entry containing the server URL (e.g., https://api.example.com:6443) and certificate-authority data. The 'unable to connect to server' error often arises when the server endpoint is unreachable due to network policies, DNS resolution failures, or expired TLS certificates. In GitLab CI, the kubeconfig is usually injected as a CI/CD variable or mounted from a Kubernetes secret; if the variable is misconfigured or the secret is missing, kubectl cannot resolve the cluster context.
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.
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The kubeconfig file for the cluster is missing or invalid. — The error 'unable to connect to server' indicates that the GitLab CI runner cannot establish a TCP connection to the Kubernetes API server. This is most commonly caused by a missing or invalid kubeconfig file, which contains the cluster endpoint, credentials, and context required by kubectl to authenticate and communicate with the cluster. Without a valid kubeconfig, the deployment stage cannot proceed.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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