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 of the following are valid reasons to use a readiness probe? (Select 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To prevent traffic from being sent to a pod that is not ready due to a dependency
A readiness probe is used to determine whether a pod is ready to serve traffic. Option A is correct because it prevents traffic from being sent to a pod that is not ready due to a dependency, such as a database or cache that hasn't fully initialized. The kubelet uses the probe's success or failure to control whether the pod's IP address is added to the endpoints of a Service, ensuring only ready pods receive requests.
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.
✓
To prevent traffic from being sent to a pod that is not ready due to a dependency
Why this is correct
Readiness probe checks if the pod can serve traffic.
Related concept
Read the scenario before looking for a memorised answer.
✓
To ensure the pod is not added to a Service until the application is ready
Why this is correct
Readiness probe controls Service endpoint membership.
Related concept
Read the scenario before looking for a memorised answer.
✗
To monitor resource usage and scale the pod
Why it's wrong here
Readiness probes do not monitor resource usage; they only check readiness.
✗
To delay the start of the application until a database is available
Why it's wrong here
A startup probe is better suited for delaying startup until dependencies are available.
✗
To restart the container if it becomes unresponsive
Why it's wrong here
This is the purpose of a liveness probe.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between readiness, liveness, and startup probes; the trap here is confusing the purpose of a readiness probe (traffic routing) with that of a liveness probe (container restart) or a startup probe (delaying other probes).
Detailed technical explanation
How to think about this question
Under the hood, a readiness probe is executed by the kubelet at a configurable interval (default 10 seconds, with initialDelaySeconds, periodSeconds, and failureThreshold). The probe can be an HTTP GET request (expecting a 200-399 status code), a TCP socket check, or a command execution (exit code 0). A subtle behavior: if a pod fails its readiness probe, it is removed from all Service endpoints, but the pod continues running and can still be accessed directly via its IP, which is useful for debugging. In a real-world scenario, a microservice that depends on a Redis cache might use a readiness probe that checks a health endpoint that verifies the Redis connection, ensuring traffic is only routed when the cache is available.
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: To prevent traffic from being sent to a pod that is not ready due to a dependency — A readiness probe is used to determine whether a pod is ready to serve traffic. Option A is correct because it prevents traffic from being sent to a pod that is not ready due to a dependency, such as a database or cache that hasn't fully initialized. The kubelet uses the probe's success or failure to control whether the pod's IP address is added to the endpoints of a Service, ensuring only ready pods receive requests.
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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