Question 875 of 991

Application Observability and Maintenance →hardMultiple ChoiceObjective-mapped

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.

A developer configures a liveness probe for a container that takes a long time to start (about 120 seconds). The probe uses httpGet on port 8080 with a path '/healthz'. The probe is configured with initialDelaySeconds=10, periodSeconds=10, failureThreshold=3. The pod enters CrashLoopBackOff. What is the MOST likely cause?

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.

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
The failureThreshold should be increased to 10
Why wrong: Even with a higher threshold, the probe would still start too early and eventually fail, causing restarts. A startup probe is the proper fix.
B
The httpGet path '/healthz' is incorrect and should be '/ready'
Why wrong: The path mismatch would cause a different error (e.g., 404), but the core issue is premature probing.
C
The readiness probe is misconfigured and should be used instead of a liveness probe
Why wrong: Readiness probes control traffic routing, not container restarts. A startup probe is the correct solution for slow-starting containers.
D
The liveness probe is failing too early because initialDelaySeconds is too low for the slow-starting container
The container needs 120 seconds to start, but the liveness probe starts after only 10 seconds. It fails quickly and triggers restarts before the container can fully start.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The liveness probe is failing too early because initialDelaySeconds is too low for the slow-starting container

The liveness probe starts after 10 seconds and will fail repeatedly because the application is not ready. After 3 failures (30 seconds total), the container is restarted, but it still needs ~120 seconds to start, causing a loop. A startup probe should be used to give the container time to start before liveness probes begin.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 failureThreshold should be increased to 10
Why it's wrong here
Even with a higher threshold, the probe would still start too early and eventually fail, causing restarts. A startup probe is the proper fix.
✗
The httpGet path '/healthz' is incorrect and should be '/ready'
Why it's wrong here
The path mismatch would cause a different error (e.g., 404), but the core issue is premature probing.
✗
The readiness probe is misconfigured and should be used instead of a liveness probe
Why it's wrong here
Readiness probes control traffic routing, not container restarts. A startup probe is the correct solution for slow-starting containers.
✓
The liveness probe is failing too early because initialDelaySeconds is too low for the slow-starting container
Why this is correct
The container needs 120 seconds to start, but the liveness probe starts after only 10 seconds. It fails quickly and triggers restarts before the container can fully start.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKAD NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this CKAD question test?

Application Observability and Maintenance — This question tests Application Observability and Maintenance — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The liveness probe is failing too early because initialDelaySeconds is too low for the slow-starting container — The liveness probe starts after 10 seconds and will fail repeatedly because the application is not ready. After 3 failures (30 seconds total), the container is restarted, but it still needs ~120 seconds to start, causing a loop. A startup probe should be used to give the container time to start before liveness probes begin.

What should I do if I get this CKAD question wrong?

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?

Static NAT maps one inside address to one outside address.

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