This KCNA practice question tests your understanding of cloud native architecture. 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 microservice logs errors when connecting to the database. The logs show 'connection refused'. Which troubleshooting step should be taken first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Verify the database Service and Endpoints in Kubernetes
Directly checks if the database service is available.
Scale up the microservice deployment
Why wrong: Does not address connectivity.
Restart the microservice pod
Why wrong: May not fix underlying connectivity issue.
Check the logs of other microservices
Why wrong: Indirect and may waste time.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Verify the database Service and Endpoints in Kubernetes
The 'connection refused' error indicates that the microservice is attempting to connect to a TCP port on the database endpoint, but no process is listening there. In Kubernetes, the first step is to verify that the database Service exists and that its Endpoints object contains the correct pod IPs and port. If the Endpoints are empty or missing, the Service is not routing traffic to any healthy database pod, which directly causes the refusal. This aligns with the Kubernetes troubleshooting hierarchy: always check the Service and Endpoints before assuming application-level issues.
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.
Verify the database Service and Endpoints in Kubernetes
Why this is correct
Directly checks if the database service is available.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Scale up the microservice deployment
Why it's wrong here
Does not address connectivity.
Restart the microservice pod
Why it's wrong here
May not fix underlying connectivity issue.
Check the logs of other microservices
Why it's wrong here
Indirect and may waste time.
Common exam traps
The trap here is that candidates often jump to restarting the pod or scaling the deployment, assuming the microservice itself is faulty, rather than recognizing that 'connection refused' is a network-level symptom pointing to the target (the database Service/Endpoints) not being available.
Detailed technical explanation
Under the hood, Kubernetes Services rely on iptables or IPVS rules to forward traffic to pod endpoints. When a Service is created without matching pod selectors (or the pods are not ready), the Endpoints controller does not populate the Endpoints object, leaving the Service with no backend targets. This causes the kube-proxy to install no forwarding rules, so any connection to the Service ClusterIP results in a TCP RST (connection refused). A real-world scenario is when a StatefulSet database pod is stuck in CrashLoopBackOff due to a misconfigured PersistentVolumeClaim, causing its readiness probe to fail and the Endpoints to be removed.
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 KCNA 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
The correct answer is: Verify the database Service and Endpoints in Kubernetes — The 'connection refused' error indicates that the microservice is attempting to connect to a TCP port on the database endpoint, but no process is listening there. In Kubernetes, the first step is to verify that the database Service exists and that its Endpoints object contains the correct pod IPs and port. If the Endpoints are empty or missing, the Service is not routing traffic to any healthy database pod, which directly causes the refusal. This aligns with the Kubernetes troubleshooting hierarchy: always check the Service and Endpoints before assuming application-level issues.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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