This KCNA practice question tests your understanding of cloud native architecture. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In a serverless architecture using Knative, what happens to a service that has not received traffic for an extended period?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It scales down to zero replicas and is reactivated on the next request
Knative scales to zero when idle, meaning no pods are running, thus no cost incurred.
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.
✗
It throws an error and must be redeployed
Why it's wrong here
No error; the service is simply scaled down.
✗
It continues running with one replica to reduce cold start latency
Why it's wrong here
Knative can scale to zero; it does not keep a minimum replica by default.
✓
It scales down to zero replicas and is reactivated on the next request
Why this is correct
Knative supports auto-scaling to zero for idle services.
Related concept
Static NAT maps one inside address to one outside address.
✗
It is automatically deleted
Why it's wrong here
The service is not deleted; it scales 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: It scales down to zero replicas and is reactivated on the next request — Knative scales to zero when idle, meaning no pods are running, thus no cost incurred.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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