This CKA practice question tests your understanding of services & networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company deploys a web application with multiple replicas in a Kubernetes cluster. Users report intermittent connectivity issues. The application pods are exposed via a ClusterIP Service. To ensure stable connectivity, which action should be taken?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set service.spec.sessionAffinity to ClientIP
Intermittent connectivity issues with multiple replicas often stem from requests being distributed across different pods, which can break session state if the application is not stateless. Setting `service.spec.sessionAffinity` to `ClientIP` ensures that all requests from a given client IP are routed to the same pod, providing stable connectivity for stateful sessions without changing the service type or removing the ClusterIP.
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.
✗
Change the Service type to NodePort
Why it's wrong here
NodePort exposes the service externally but does not affect internal session stickiness.
✓
Set service.spec.sessionAffinity to ClientIP
Why this is correct
ClientIP session affinity ensures requests from the same client are routed to the same pod, resolving intermittent connectivity due to session state.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remove the ClusterIP Service and use headless service
Why it's wrong here
Headless service returns pod IPs directly, which may cause DNS caching issues and worsen connectivity.
✗
Add a readiness probe to the pods
Why it's wrong here
Readiness probes ensure pods are ready but do not provide session stickiness.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse readiness probes (which ensure pods are healthy) with session affinity (which ensures client requests stick to the same pod), leading them to select the readiness probe option despite it not solving the session persistence problem.
Detailed technical explanation
How to think about this question
Session affinity in Kubernetes is implemented via iptables or IPVS rules that hash the client IP (or a combination of source IP and port) to select a specific backend pod, with a default timeout of 10800 seconds (3 hours) for the `ClientIP` mode. This is particularly important for applications using in-memory sessions or WebSocket connections, where routing to a different pod would cause session loss or disconnection. The `service.spec.sessionAffinityConfig.clientIP.timeoutSeconds` field allows tuning the persistence duration to match application needs.
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.
Services & Networking — This question tests Services & Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set service.spec.sessionAffinity to ClientIP — Intermittent connectivity issues with multiple replicas often stem from requests being distributed across different pods, which can break session state if the application is not stateless. Setting `service.spec.sessionAffinity` to `ClientIP` ensures that all requests from a given client IP are routed to the same pod, providing stable connectivity for stateful sessions without changing the service type or removing the ClusterIP.
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.
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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