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.
A company wants to migrate its monolithic application to a cloud-native architecture on Kubernetes. The application currently uses a shared database and communicates via internal HTTP calls. Which design pattern should be applied first to increase resilience and enable independent scaling of components?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the strangler fig pattern to gradually replace monolith functionality
The strangler fig pattern is the correct first step because it allows the team to incrementally replace specific functionalities of the monolithic application with microservices without disrupting the existing system. This pattern routes requests to either the old monolith or new services, enabling gradual migration, independent scaling of extracted components, and improved resilience by isolating failures. It directly addresses the need to move from a shared-database, HTTP-calling monolith to a cloud-native architecture on Kubernetes.
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.
✗
Adopt CQRS pattern to separate reads and writes
Why it's wrong here
CQRS is for query optimization, not migration.
✓
Use the strangler fig pattern to gradually replace monolith functionality
Why this is correct
Allows incremental migration with minimal risk.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement database-per-service pattern
Why it's wrong here
This is a later step after decomposition.
✗
Deploy a sidecar container for each service
Why it's wrong here
Sidecar is for cross-cutting concerns, not migration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that you should immediately apply a database-per-service or CQRS pattern when migrating, but the strangler fig pattern is the foundational first step to safely decompose a monolith without a big-bang rewrite.
Detailed technical explanation
How to think about this question
The strangler fig pattern, named after the fig tree that grows around a host tree, works by placing a reverse proxy or API gateway (e.g., NGINX, Envoy) in front of the monolith to intercept requests. As new microservices are built, the gateway routes specific endpoints (e.g., /users, /orders) to the new services, while the rest still hits the monolith. This allows each new service to be scaled independently via Kubernetes HorizontalPodAutoscaler based on metrics like CPU or request latency, and failures in new services do not cascade to the monolith, increasing overall resilience.
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 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.
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the strangler fig pattern to gradually replace monolith functionality — The strangler fig pattern is the correct first step because it allows the team to incrementally replace specific functionalities of the monolithic application with microservices without disrupting the existing system. This pattern routes requests to either the old monolith or new services, enabling gradual migration, independent scaling of extracted components, and improved resilience by isolating failures. It directly addresses the need to move from a shared-database, HTTP-calling monolith to a cloud-native architecture on Kubernetes.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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