CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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.
Which TWO statements about readiness probes are correct? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Readiness probes run continuously after the container starts
Option B is correct because readiness probes are designed to run continuously throughout the lifecycle of a container, not just during startup. They are periodically executed by the kubelet to determine whether the container is ready to accept traffic, and their success or failure directly controls the pod's inclusion in Service endpoints.
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.
✗
Readiness probes are only used during initial startup
Why it's wrong here
Readiness probes run continuously, not just during startup.
✓
Readiness probes run continuously after the container starts
Why this is correct
They run periodically according to the probe configuration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Readiness probes can only be of type httpGet
Why it's wrong here
Readiness probes support httpGet, tcpSocket, exec, and grpc.
✗
Readiness probes restart the container if they fail
Why it's wrong here
Liveness probes restart containers; readiness probes do not.
✓
If a readiness probe fails, the pod is removed from all Service endpoints
Why this is correct
This is the primary purpose of a readiness probe.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing readiness probes with liveness probes, leading candidates to incorrectly think readiness probes restart containers or are only used at startup, when in fact readiness probes manage traffic routing without restarting the pod.
Detailed technical explanation
How to think about this question
Readiness probes are configured via the `readinessProbe` field in a pod spec and are executed by the kubelet at a configurable `periodSeconds` interval (default 10s). If a readiness probe fails, the pod's IP is removed from all associated Service endpoints, but the pod continues running; this allows for graceful traffic management during rolling updates or temporary unavailability. A common real-world scenario is using an exec probe to check for a specific file or a tcpSocket probe to verify a database connection before marking the pod ready.
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 CKAD 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 CKAD question in full detail.
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Readiness probes run continuously after the container starts — Option B is correct because readiness probes are designed to run continuously throughout the lifecycle of a container, not just during startup. They are periodically executed by the kubelet to determine whether the container is ready to accept traffic, and their success or failure directly controls the pod's inclusion in Service endpoints.
What should I do if I get this CKAD 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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