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 tasked with troubleshooting a production Kubernetes cluster. A user reports that they cannot access a web application running in the cluster. The application is deployed as a Deployment named 'frontend' with 2 replicas, exposed via a Service of type LoadBalancer. You have kubectl access to the cluster. You run 'kubectl get pods -l app=frontend' and see both pods are Running and Ready. You run 'kubectl get svc frontend' and see the Service has an external IP of 192.168.1.100. However, when you curl http://192.168.1.100 from a machine outside the cluster, you get a connection timeout. You are able to curl the pod IPs directly from within the cluster and get a response. Which of the following is the most likely cause of the issue?
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 cloud provider's load balancer is not properly configured or the security group/firewall is blocking traffic to the node ports.
The pods are running and ready, and the service has an external IP, but external access fails with a connection timeout while internal access to pod IPs works. This indicates the cloud provider's load balancer is not properly routing traffic to the node ports, or a security group/firewall is blocking inbound traffic on the node port range (30000-32767). The load balancer must forward traffic to the node ports, and the nodes must allow that traffic.
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 Service selector does not match the pod labels.
Why it's wrong here
If selector didn't match, pods would not be endpoints.
✓
The cloud provider's load balancer is not properly configured or the security group/firewall is blocking traffic to the node ports.
Why this is correct
External timeout with internal success indicates network path issue.
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 NodePort service type is not enabled in the cluster.
Why it's wrong here
NodePort is not needed for LoadBalancer.
✗
The Ingress resource is missing or misconfigured.
Why it's wrong here
LoadBalancer type does not require Ingress.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a LoadBalancer Service automatically works end-to-end, but the CKA exam tests the understanding that cloud provider integration (security groups, load balancer health checks) is a separate layer that can fail even when Kubernetes components are healthy.
Detailed technical explanation
How to think about this question
A LoadBalancer Service in Kubernetes creates a NodePort and ClusterIP automatically, then provisions an external load balancer (e.g., AWS ELB, GCP TCP LB) that forwards traffic to the NodePort on each node. The connection timeout suggests the load balancer is not reaching the nodes (e.g., security group rules missing for the node port, or the load balancer health check is failing and marking nodes as unhealthy). In cloud environments, the load balancer's target group must include the node instances and allow traffic on the node port, and the node's firewall must permit inbound traffic on that port from the load balancer's source range.
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 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.
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: The cloud provider's load balancer is not properly configured or the security group/firewall is blocking traffic to the node ports. — The pods are running and ready, and the service has an external IP, but external access fails with a connection timeout while internal access to pod IPs works. This indicates the cloud provider's load balancer is not properly routing traffic to the node ports, or a security group/firewall is blocking inbound traffic on the node port range (30000-32767). The load balancer must forward traffic to the node ports, and the nodes must allow that traffic.
What should I do if I get this CKA 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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