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Workloads & Scheduling →mediumMultiple ChoiceObjective-mapped

CKA Workloads & Scheduling Practice Question

This CKA practice question tests your understanding of workloads & scheduling. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.

Your team is deploying a new application that consists of a web frontend and a backend API. The frontend must be accessible from outside the cluster, and the backend should only be accessible from within the cluster. The cluster has multiple namespaces: 'frontend' and 'backend'. You have been asked to design the deployment. The frontend Deployment should have 5 replicas, and the backend Deployment should have 3 replicas. Additionally, you need to ensure that the frontend pods can communicate with the backend pods using a stable DNS name. You also want to isolate the backend from other namespaces. Which set of resources should you create?

Question 1mediummultiple choice
Read the full DNS explanation →

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

✓

Frontend: Deployment, Service (LoadBalancer); Backend: Deployment, Service (ClusterIP); NetworkPolicy to allow ingress from frontend namespace and deny others

Option D is correct because it uses a LoadBalancer Service for the frontend to provide external access, a ClusterIP Service for the backend to restrict access to within the cluster, and a NetworkPolicy that allows ingress traffic from the frontend namespace to the backend while denying all other ingress, thus isolating the backend. This ensures the frontend pods can reach the backend via a stable DNS name (the ClusterIP Service's DNS name) and meets the requirement of backend isolation from other namespaces.

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.

  • ✗

    Frontend: Deployment, Service (NodePort); Backend: Deployment, Service (ClusterIP); no NetworkPolicy

    Why it's wrong here

    NodePort works but lacks isolation for backend.

  • ✗

    Frontend: Deployment, Service (ClusterIP); Backend: Deployment, Service (ClusterIP); NetworkPolicy to allow ingress from frontend namespace

    Why it's wrong here

    Frontend needs external access; ClusterIP is not externally accessible.

  • ✗

    Frontend: Deployment, Service (LoadBalancer); Backend: Deployment, Service (LoadBalancer); NetworkPolicy to allow only frontend to backend

    Why it's wrong here

    Backend should not be externally accessible; LoadBalancer would expose it.

  • ✓

    Frontend: Deployment, Service (LoadBalancer); Backend: Deployment, Service (ClusterIP); NetworkPolicy to allow ingress from frontend namespace and deny others

    Why this is correct

    LoadBalancer exposes frontend externally, ClusterIP for internal backend, and NetworkPolicy restricts backend access.

    Related concept

    Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often forget that a ClusterIP Service cannot be accessed from outside the cluster, and they may incorrectly choose a LoadBalancer or NodePort for the backend, or omit the NetworkPolicy needed to enforce isolation.

Detailed technical explanation

How to think about this question

A LoadBalancer Service provisions an external load balancer (e.g., in cloud environments) that routes traffic to the frontend pods, while a ClusterIP Service creates a virtual IP that is only reachable within the cluster. NetworkPolicies use label selectors and namespace selectors to control pod-to-pod traffic; in this case, an ingress rule with a namespaceSelector matching the 'frontend' namespace allows traffic from frontend pods to backend pods, and the default deny behavior (if specified) blocks all other ingress. The stable DNS name for the backend is derived from the ClusterIP Service's name and namespace (e.g., backend-svc.backend.svc.cluster.local), which is resolvable by CoreDNS within the cluster.

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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

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 CKA question test?

Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Frontend: Deployment, Service (LoadBalancer); Backend: Deployment, Service (ClusterIP); NetworkPolicy to allow ingress from frontend namespace and deny others — Option D is correct because it uses a LoadBalancer Service for the frontend to provide external access, a ClusterIP Service for the backend to restrict access to within the cluster, and a NetworkPolicy that allows ingress traffic from the frontend namespace to the backend while denying all other ingress, thus isolating the backend. This ensures the frontend pods can reach the backend via a stable DNS name (the ClusterIP Service's DNS name) and meets the requirement of backend isolation from other namespaces.

What should I do if I get this CKA 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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Last reviewed: Jun 11, 2026

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This CKA 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 CKA exam.