This CKA practice question tests your understanding of troubleshooting. 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.
You are troubleshooting a network connectivity issue between two pods in different namespaces. The pods have the following labels: pod-a in namespace 'foo' with labels {app: web}, pod-b in namespace 'bar' with labels {app: db}. You verify that both pods have IP addresses and can ping the Kubernetes service IP. However, pod-a cannot connect to pod-b on port 5432. What should you check 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.
Check if the kube-proxy is running on the node hosting pod-b
Why wrong: Since they can ping the Kubernetes service IP, kube-proxy is likely working.
B
Check if a NetworkPolicy exists that denies ingress traffic to pod-b from namespace 'foo'
A NetworkPolicy may be blocking traffic from pod-a to pod-b, especially across namespaces.
C
Check if the container runtime is Docker
Why wrong: The container runtime (e.g., Docker, containerd) does not affect pod-to-pod connectivity at this level.
D
Check if the DNS resolution for pod-b's service is correct
Why wrong: DNS is not involved because they are connecting via IP or service name? The question says they cannot connect on port 5432, implying a direct connection attempt.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check if a NetworkPolicy exists that denies ingress traffic to pod-b from namespace 'foo'
Option A is correct. NetworkPolicies can restrict ingress traffic across namespaces. Since pod-a can reach the Kubernetes service, the issue is likely a NetworkPolicy blocking the specific traffic. Options B, C, and D are less likely.
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.
✗
Check if the kube-proxy is running on the node hosting pod-b
Why it's wrong here
Since they can ping the Kubernetes service IP, kube-proxy is likely working.
✓
Check if a NetworkPolicy exists that denies ingress traffic to pod-b from namespace 'foo'
Why this is correct
A NetworkPolicy may be blocking traffic from pod-a to pod-b, especially across namespaces.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check if the container runtime is Docker
Why it's wrong here
The container runtime (e.g., Docker, containerd) does not affect pod-to-pod connectivity at this level.
✗
Check if the DNS resolution for pod-b's service is correct
Why it's wrong here
DNS is not involved because they are connecting via IP or service name? The question says they cannot connect on port 5432, implying a direct connection attempt.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CKA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check if a NetworkPolicy exists that denies ingress traffic to pod-b from namespace 'foo' — Option A is correct. NetworkPolicies can restrict ingress traffic across namespaces. Since pod-a can reach the Kubernetes service, the issue is likely a NetworkPolicy blocking the specific traffic. Options B, C, and D are less likely.
What should I do if I get this CKA question wrong?
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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