A company has multiple microservices that are exposed to external clients. They need to implement rate limiting per client, but they also need to ensure that the rate limiting is consistent across multiple instances of the API gateway. What should they use?

A distributed rate limiting solution using a shared data store like Redis

In-memory rate limiting in each gateway instance

Rate limiting based on IP address only

Rate limiting at the application layer in each microservice

What is the primary purpose of a feature flag in progressive delivery?

To replace the need for version control

To automatically scale applications based on traffic

To enable or disable a feature at runtime without deploying new code

To permanently remove old code from the codebase

In Kubernetes, what is the primary purpose of an Ingress resource?

To manage external HTTP(S) traffic into the cluster based on hostnames and paths

To provide a stable internal IP address for a Service

To allow pods to access external databases

To encrypt traffic between pods within the cluster

A team is performing a canary release of a new version of their checkout service. They are monitoring error rate and latency. The error rate for the canary is 2%, while the stable version has an error rate of 0.5%. However, the canary's p99 latency is 200ms, which is better than the stable version's 300ms. What should the team do?

Increase the canary traffic to get more data

Ignore the error rate and focus on latency

Proceed with the canary because latency is better

Roll back the canary because the error rate is higher

Kubernetes and Cloud Native Associate (KCNA)

Domain 3Objective 1

Application Delivery KCNA Practice Questions (Page 4)

Part of the Cloud Native Application Delivery domain, which accounts for 16% of the KCNA exam. Linux Foundation does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–10 in this domain), expect 2–3 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

7free pages

8concepts

16%of the exam

Questions 16–20

16expert · hard
A company has multiple microservices that are exposed to external clients. They need to implement rate limiting per client, but they also need to ensure that the rate limiting is consistent across multiple instances of the API gateway. What should they use?
Select an answer first
17foundation · easy
What is the primary purpose of a feature flag in progressive delivery?
Select an answer first
18foundation · easy
In Kubernetes, what is the primary purpose of an Ingress resource?
Select an answer first
19application · medium
A load balancer distributes traffic to a pool of backend servers. Some servers have more powerful hardware and can handle more connections. The team wants to maximize throughput by sending more traffic to the more powerful servers. Which load balancing algorithm should they use?
Select an answer first
20expert · hard
A team is performing a canary release of a new version of their checkout service. They are monitoring error rate and latency. The error rate for the canary is 2%, while the stable version has an error rate of 0.5%. However, the canary's p99 latency is 200ms, which is better than the stable version's 300ms. What should the team do?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to KCNA

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Linux Foundation. “KCNA” is a trademark of its owner, used for identification only.

Application Delivery KCNA Practice Questions (Page 4)

Questions 16–20

A company has multiple microservices that are exposed to external clients. They need to implement rate limiting per client, but they also need to ensure that the rate limiting is consistent across multiple instances of the API gateway. What should they use?

What is the primary purpose of a feature flag in progressive delivery?

In Kubernetes, what is the primary purpose of an Ingress resource?

A load balancer distributes traffic to a pool of backend servers. Some servers have more powerful hardware and can handle more connections. The team wants to maximize throughput by sending more traffic to the more powerful servers. Which load balancing algorithm should they use?

Keep studying — Cloud Native Application Delivery