CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 have a Deployment running a web server that takes 30 seconds to initialize. You want to ensure that the load balancer does not send traffic to the pod until it is ready. Which probe should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Readiness probe
A Readiness probe is the correct choice because it determines whether a Pod is ready to serve traffic. In this scenario, the web server takes 30 seconds to initialize, so a Readiness probe (e.g., an HTTP GET on the application's health endpoint) will prevent the Service (and thus the load balancer) from sending requests until the probe succeeds, ensuring zero traffic is routed to an uninitialized Pod.
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 probe
Why this is correct
Readiness probes indicate whether a pod is ready to serve traffic; if it fails, the pod is removed from Service endpoints.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resource limit
Why it's wrong here
Resource limits control CPU/memory but do not affect traffic routing.
✗
Startup probe
Why it's wrong here
Startup probes are used to give slow-starting containers time to start, but they do not directly control traffic routing after startup.
✗
Liveness probe
Why it's wrong here
Liveness probes determine if a container is running; they do not control traffic routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Startup probes with Readiness probes, thinking a Startup probe alone will gate traffic, but only the Readiness probe controls whether the Service routes traffic to the Pod.
Detailed technical explanation
How to think about this question
Under the hood, a Readiness probe is checked periodically (default interval: 10 seconds, timeout: 1 second) and its success/failure updates the Pod's 'Ready' condition in the EndpointSlice or Endpoints object. The Service's load balancer (e.g., kube-proxy with iptables or IPVS) only forwards traffic to Pods with the 'Ready' condition set to True. For a slow-initializing web server, a Readiness probe with an initialDelaySeconds of, say, 5 seconds and a failureThreshold of 3 ensures the Pod is not marked Ready until the probe succeeds, which can be tuned to match the 30-second initialization time.
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 probe — A Readiness probe is the correct choice because it determines whether a Pod is ready to serve traffic. In this scenario, the web server takes 30 seconds to initialize, so a Readiness probe (e.g., an HTTP GET on the application's health endpoint) will prevent the Service (and thus the load balancer) from sending requests until the probe succeeds, ensuring zero traffic is routed to an uninitialized Pod.
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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