Explain Architectural Patterns (monolithic, Services Oriented, Microservices, and Event Driven) 350-901 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A company has an application that needs to send a confirmation email to a customer after an order is placed. The email service is sometimes slow or unavailable. The company does not want the order placement to be delayed or fail because of the email service. Which architectural approach best meets this requirement?

   • AUse a batch job that runs every hour to send emails for all new orders
   • BCall the email service synchronously from the order service
   • CUse a shared database where the order service writes and the email service polls for new orders
   • DPublish an 'OrderPlaced' event to a message broker; a separate email service consumes the event and sends the email
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   What is a key characteristic of communication in an event-driven architecture?

   • ACommunication is asynchronous, and the producer does not wait for a response.
   • BCommunication is synchronous, with the producer waiting for a response.
   • CCommunication is based on a shared database that all components access.
   • DCommunication is based on direct point-to-point connections between services.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   An online retailer has a monolithic application that processes orders. The order service writes to a database and then synchronously calls an inventory service and a shipping service. During peak sales, the inventory service becomes slow, causing order processing to fail. The team wants to decouple order processing from the downstream services so that a slow inventory service does not block order acceptance. Which architectural change best addresses this requirement?

   • AMove the inventory service to a separate server with more resources
   • BChange the order service to call the inventory service using a REST API instead of a direct database call
   • CIncrease the timeout on the synchronous call from the order service to the inventory service
   • DRefactor the order service to publish an 'OrderPlaced' event to a message broker, and have inventory and shipping services consume that event asynchronously
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   Which statement best describes a microservices architecture?

   • AServices are loosely coupled and communicate through an enterprise service bus.
   • BThe application is built as a single deployable unit with a shared codebase.
   • CThe application uses a message broker to decouple event producers and consumers.
   • DThe application is composed of small, independently deployable services that communicate via APIs.
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Which statement best describes a monolithic architecture?

   • AThe application is divided into layers, each deployed as a separate unit and communicating via an enterprise service bus.
   • BThe application uses a message broker to decouple producers and consumers of events.
   • CThe application is built as a single deployable unit with a shared codebase and a common runtime process.
   • DThe application is composed of multiple small services, each independently deployable and communicating via APIs.
   Reveal Solution Discussion Select an answer first