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Operations and Support →mediumMultiple ChoiceObjective-mapped

CV0-004 Operations and Support Practice Question

This CV0-004 practice question tests your understanding of operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

Refer to the exhibit.

```yaml
# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "500m"
---
apiVersion: v1
kind: Service
metadata:
  name: frontend-service
spec:
  type: LoadBalancer
  selector:
    app: frontend
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
```

A cloud engineer deploys the Kubernetes manifest shown in the exhibit. After deployment, the frontend pods are in CrashLoopBackOff state. The engineer checks the logs and finds 'OOMKilled' errors. Which of the following changes would resolve the issue?

Question 1mediummultiple choice
Full question →

Exhibit

Refer to the exhibit.

```yaml
# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "500m"
---
apiVersion: v1
kind: Service
metadata:
  name: frontend-service
spec:
  type: LoadBalancer
  selector:
    app: frontend
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
```

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

✓

Increase the memory limit to 1Gi.

The 'OOMKilled' error indicates the container's memory usage exceeded its configured limit, causing the kernel's Out-Of-Memory (OOM) killer to terminate the process. Increasing the memory limit to 1Gi provides the container with more memory headroom, preventing the OOM kill and allowing the pod to run without crashing.

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.

  • ✓

    Increase the memory limit to 1Gi.

    Why this is correct

    Increasing memory limit allows the container to use more memory without being killed.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Increase the number of replicas to 5.

    Why it's wrong here

    More replicas do not fix the memory limit per pod.

  • ✗

    Reduce the CPU limit to 250m.

    Why it's wrong here

    CPU limit is unrelated to OOM errors.

  • ✗

    Change the service type to ClusterIP.

    Why it's wrong here

    Service type does not affect pod resource limits.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CompTIA often tests the distinction between resource limits (memory vs. CPU) and scaling strategies, trapping candidates who confuse horizontal scaling (replicas) with vertical scaling (resource limits).

Detailed technical explanation

How to think about this question

Kubernetes enforces memory limits via cgroups; when a container exceeds its memory limit, the kernel's OOM killer terminates the container's main process, resulting in an 'OOMKilled' exit code (137). The CrashLoopBackOff state occurs because the container repeatedly starts, hits the limit, and is killed. In production, setting appropriate resource requests and limits based on profiling (e.g., using 'kubectl top pod' or metrics-server) is critical to avoid both OOM kills and resource waste.

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 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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this CV0-004 question test?

Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Increase the memory limit to 1Gi. — The 'OOMKilled' error indicates the container's memory usage exceeded its configured limit, causing the kernel's Out-Of-Memory (OOM) killer to terminate the process. Increasing the memory limit to 1Gi provides the container with more memory headroom, preventing the OOM kill and allowing the pod to run without crashing.

What should I do if I get this CV0-004 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.

About these practice questions

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Last reviewed: Jun 30, 2026

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This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.