This KCNA practice question tests your understanding of cloud native architecture. 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.
A company wants to implement a serverless function that processes events from an Amazon S3 bucket. The function should scale to zero when idle and only incur costs during execution. Which technology is BEST suited for this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Lambda
Option A is correct. AWS Lambda is a FaaS (Function as a Service) that scales to zero when idle and is event-driven. Option B (Apache Kafka) is a streaming platform, not serverless functions. Option C (Knative) is serverless but runs on Kubernetes, requiring cluster management. Option D (Kubernetes CronJob) is for scheduled jobs, not event-driven, and does not scale to zero automatically.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 provides serverless capabilities on Kubernetes but requires cluster management and does not scale to zero as seamlessly as Lambda.
✗
Apache Kafka
Why it's wrong here
Kafka is a distributed streaming platform, not a serverless function platform.
✓
AWS Lambda
Why this is correct
AWS Lambda is a FaaS platform that executes code in response to events and scales to zero when idle.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Kubernetes CronJob
Why it's wrong here
CronJobs are time-based, not event-driven, and do not scale to zero.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related KCNA NAT questions on configuration and troubleshooting.
Cloud Native Architecture — This question tests Cloud Native Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: AWS Lambda — Option A is correct. AWS Lambda is a FaaS (Function as a Service) that scales to zero when idle and is event-driven. Option B (Apache Kafka) is a streaming platform, not serverless functions. Option C (Knative) is serverless but runs on Kubernetes, requiring cluster management. Option D (Kubernetes CronJob) is for scheduled jobs, not event-driven, and does not scale to zero automatically.
What should I do if I get this KCNA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related KCNA NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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