KCNA Knative Practice Question
A company wants to implement a serverless function that processes events from an object storage bucket. The function should scale to zero when idle and only incur costs during execution. Which technology is BEST suited for this requirement?
⚠ Common exam trap
Candidates may mistakenly think that Knative requires always-on pods, but Knative's autoscaler scales to zero when no requests are incoming.
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
✓
A Functions-as-a-Service (FaaS) platform
A Functions-as-a-Service (FaaS) platform is a serverless compute service that scales to zero when idle and is event-driven, making it ideal for processing events from an object storage bucket with cost efficiency. Option A (Knative) is serverless but runs on Kubernetes, requiring cluster management and not scaling to zero as cleanly. Option B (Apache Kafka) is a streaming platform, not a serverless function service. Option D (Kubernetes CronJob) is for scheduled jobs, not event-driven, and does not scale to zero automatically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Knative
Why it's wrong here
Knative is a serverless framework on Kubernetes, but it requires cluster management and may not scale to zero as efficiently as a FaaS platform.
- ✗
Apache Kafka
Why it's wrong here
Apache Kafka is a distributed streaming platform, not designed for serverless function execution.
- ✓
A Functions-as-a-Service (FaaS) platform
Why this is correct
A FaaS platform provides event-driven serverless functions that scale to zero and are ideal for processing events from object storage.
- ✗
Kubernetes CronJob
Why it's wrong here
Kubernetes CronJob is for scheduled tasks, not event-driven processing, and does not automatically scale to zero.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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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.