mediumMultiple ChoiceObjective-mapped
200-901 Practice Question: Refer to the exhibit
Exhibit
apiVersion: apps/v1
kind: Deployment
metadata:
name: webapp
spec:
replicas: 3
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
maxSurge: 1
selector:
matchLabels:
app: webapp
template:
metadata:
labels:
app: webapp
spec:
containers:
- name: web
image: nginx:1.21
ports:
- containerPort: 80
readinessProbe:
httpGet:
path: /health
port: 80
initialDelaySeconds: 5
periodSeconds: 10Refer to the exhibit. During a rolling update, a developer notices that the new pods are not passing the readiness probe and the update stalls. What is the most likely reason?
⚠ Common exam trap
Cisco often tests the distinction between readiness and liveness probes, and the trap here is that candidates may confuse a readiness probe failure with a liveness probe failure or assume the issue is with the rolling update strategy configuration rather than the application endpoint not being implemented.
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 readiness probe path /health is not implemented in the new image.
The rolling update stalls because the new pods fail the readiness probe. The readiness probe is configured to check the /health endpoint, and if that endpoint is not implemented in the new image, the probe never returns a success status. Kubernetes will not route traffic to pods that fail the readiness probe, and the rolling update will not proceed to replace old pods until the new ones are ready.
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 rolling update strategy is configured incorrectly with maxUnavailable and maxSurge.
Why it's wrong here
The configuration is standard and should work.
- ✓
The readiness probe path /health is not implemented in the new image.
Why this is correct
If the endpoint is missing, the probe fails and pods remain not ready.
- ✗
The image tag is incorrect.
Why it's wrong here
The tag nginx:1.21 exists; incorrect tag would cause image pull failure, not probe failure.
- ✗
The selector does not match the new pods' labels.
Why it's wrong here
The selector matches the template labels, so new pods have the correct labels.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.