The answer is Deployment, as it is the correct Kubernetes resource for managing stateless microservices that require automatic pod replacement to maintain a desired replica count. A Deployment uses a ReplicaSet controller to ensure the specified number of pod replicas are running, and if a pod fails, the controller immediately creates a new pod to restore the desired state, making it ideal for stateless workloads where pod identity and persistent storage are not needed. On the Google Professional Cloud Developer exam, this question tests your understanding of when to choose Deployment over StatefulSet—a common trap is selecting StatefulSet because it also manages replicas, but StatefulSet is designed for stateful applications requiring stable network identities and persistent storage, not for stateless microservices. Remember the memory tip: "Deployments don't care about pod names; StatefulSets do."
PCD Practice Question: Designing highly scalable, available, and reliable cloud-native applications
This PCD practice question tests your understanding of designing highly scalable, available, and reliable cloud-native applications. 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.
A team is deploying a microservices application on Google Kubernetes Engine (GKE). They want to ensure that if a pod fails, Kubernetes automatically replaces it and maintains the desired number of replicas. Which Kubernetes resource should they use?
Why wrong: StatefulSet is used for stateful applications where each pod requires a unique identity and stable storage. It does not automatically replace pods in the same way as a Deployment.
B
Deployment
A Deployment provides declarative updates for pods and ReplicaSets. It ensures that the desired number of pods are running and replaces failed pods automatically.
C
Job
Why wrong: A Job is used for batch processing tasks that run to completion. It does not maintain a running set of replicas.
D
DaemonSet
Why wrong: A DaemonSet ensures that a copy of a pod runs on each node in the cluster. It does not manage replicas based on a desired count.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deployment
A Deployment is the correct Kubernetes resource for managing stateless microservices that require automatic pod replacement to maintain a desired replica count. It uses a ReplicaSet to ensure the specified number of pod replicas are running, and if a pod fails, the ReplicaSet controller immediately creates a new pod to restore the desired state.
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.
✗
StatefulSet
Why it's wrong here
StatefulSet is used for stateful applications where each pod requires a unique identity and stable storage. It does not automatically replace pods in the same way as a Deployment.
✓
Deployment
Why this is correct
A Deployment provides declarative updates for pods and ReplicaSets. It ensures that the desired number of pods are running and replaces failed pods automatically.
Related concept
Read the scenario before looking for a memorised answer.
✗
Job
Why it's wrong here
A Job is used for batch processing tasks that run to completion. It does not maintain a running set of replicas.
✗
DaemonSet
Why it's wrong here
A DaemonSet ensures that a copy of a pod runs on each node in the cluster. It does not manage replicas based on a desired count.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between stateless and stateful workloads, where candidates mistakenly choose StatefulSet for any application that needs high availability, overlooking that Deployments are the standard for stateless microservices with automatic replacement.
Detailed technical explanation
How to think about this question
Under the hood, a Deployment manages a ReplicaSet, which uses a label selector and a pod template to create and monitor pods. When a pod fails, the ReplicaSet controller detects the mismatch between the current and desired replica count via the Kubernetes API server's watch mechanism and immediately schedules a replacement pod. In a real-world scenario, if a microservice experiences a crash loop, the Deployment's rollout history and rollback capabilities allow you to revert to a previous stable version without manual intervention.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Designing highly scalable, available, and reliable cloud-native applications — This question tests Designing highly scalable, available, and reliable cloud-native applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deployment — A Deployment is the correct Kubernetes resource for managing stateless microservices that require automatic pod replacement to maintain a desired replica count. It uses a ReplicaSet to ensure the specified number of pod replicas are running, and if a pod fails, the ReplicaSet controller immediately creates a new pod to restore the desired state.
What should I do if I get this PCD 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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Question Discussion
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