KCNA Kubernetes Fundamentals Practice Question
Exhibit
Refer to the exhibit.
```
apiVersion: v1
kind: Pod
metadata:
name: web-pod
spec:
containers:
- name: web
image: nginx:1.21
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /healthz
port: 8080
initialDelaySeconds: 3
periodSeconds: 5
```Refer to the exhibit. A pod is created with the above manifest. The container runs nginx listening on port 80, but the liveness probe is configured to check port 8080. What will happen?
⚠ Common exam trap
The KCNA exam often tests the distinction between probe failure and pod startup failure—candidates mistakenly think a misconfigured probe prevents the pod from starting, but Kubernetes always starts the container first and then evaluates probes asynchronously.
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 will fail, causing the container to be restarted.
The liveness probe is configured to check port 8080, but the container only listens on port 80. Since the probe will never receive a successful HTTP response from port 8080, it will fail repeatedly. According to Kubernetes behavior, after the failure threshold is reached (default: 3 failures with a 10-second interval), kubelet will restart the container to attempt to recover it. This is the intended mechanism for detecting and remediating deadlocked or unresponsive applications.
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 pod will fail to start because the probe port mismatches the container port.
Why it's wrong here
Incorrect; the pod starts, but probe fails later.
- ✗
The liveness probe will fail, but the pod will still be marked as Ready.
Why it's wrong here
Incorrect; readiness is separate; liveness failure causes restart, but pod may be ready initially.
- ✓
The liveness probe will fail, causing the container to be restarted.
Why this is correct
Correct; liveness probe failure leads to restart.
- ✗
The pod will run successfully because the probe is not required.
Why it's wrong here
Incorrect; the probe will fail and cause restarts.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCNA exam.