Exercise

Architecture Patterns: Check Your Understanding

Five questions covering hexagonal and clean architecture, microservices trade-offs, and the API gateway pattern from this learning path.

1. In Hexagonal Architecture (Ports and Adapters), what is the role of a 'port'?

A network port number the service listens onA database connection poolAn interface defined by the application core that adapters implement to connect it to the outside worldA physical slot in a server rack

2. What does the Dependency Rule in Clean Architecture state?

Every class must depend on at least one interfaceOuter layers may never be covered by testsAll dependencies must be resolved through a global service locatorSource code dependencies must point only inward, toward higher-level policies

3. Which of these is a commonly cited drawback of a microservices architecture?

Inability to scale individual components independentlyBeing forced onto a single shared database for all servicesIncreased operational complexity from distributed communication, deployment, and monitoringElimination of network latency between components

4. What is a reasonable signal that part of a monolith should be split into a separate service?

The team wants to try a trendy new technologyA specific module has distinct scaling, deployment, or ownership needs that the monolith is constrainingThe codebase is under 1,000 lines of codeAll modules already deploy together on the same schedule with no friction

5. What is a primary responsibility of an API Gateway in a service-oriented architecture?

Storing the business data owned by every backing serviceCompiling application code at build timeEliminating the need for services to communicate with each otherActing as a single entry point that routes requests and can centralize cross-cutting concerns like auth, rate limiting, and response aggregation

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