This 200-901 practice question tests your understanding of software development and design. 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 the context of microservices for network automation, which pattern ensures that each service has a separate database to avoid tight coupling?
Circuit breaker
Why wrong: Circuit breaker handles failures, not database architecture.
Database per service
This pattern gives each microservice its own database, promoting loose coupling.
API gateway
Why wrong: API gateway is a single entry point for microservices, not related to database separation.
Shared database
Why wrong: Shared database creates tight coupling between services.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Database per service
Database per service pattern ensures each microservice has its own database, preventing tight coupling. Shared database couples services, API gateway is for routing, circuit breaker for fault tolerance.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Circuit breaker
Why it's wrong here
Circuit breaker handles failures, not database architecture.
Database per service
Why this is correct
This pattern gives each microservice its own database, promoting loose coupling.
Related concept
Static NAT maps one inside address to one outside address.
API gateway
Why it's wrong here
API gateway is a single entry point for microservices, not related to database separation.
Shared database
Why it's wrong here
Shared database creates tight coupling between services.
Common exam traps
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
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.
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
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.
What to study next
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 200-901 NAT questions on configuration and troubleshooting.
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FAQ
Software Development and Design — This question tests Software Development and Design — Static NAT maps one inside address to one outside address..
The correct answer is: Database per service — Database per service pattern ensures each microservice has its own database, preventing tight coupling. Shared database couples services, API gateway is for routing, circuit breaker for fault tolerance.
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 200-901 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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