Download Virto Commerce Professional Developer Practice Exam Questions and more Exams Technology in PDF only on Docsity!
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Question 1. Which architectural style best describes Virto Commerce’s core platform? A) Monolithic B) Service‑Oriented Architecture (SOA) C) Headless, modular, API‑first D) Event‑driven only Answer: C Explanation: Virto Commerce is built as a headless, modular platform that exposes APIs first, allowing front‑ends and extensions to consume its services independently. Question 2. In the Clean Core principle, which layer should contain business rules without any external dependencies? A) Presentation layer B) Infrastructure layer C) Core domain layer D) Data access layer Answer: C Explanation: The Clean Core principle isolates business logic in the core domain layer, keeping it free from UI, infrastructure, or external framework dependencies.
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Question 3. Which .NET technology is the foundation for the latest Virto Commerce platform? A) .NET Framework 4. B) .NET Core 3.1 / .NET 6+ C) Silverlight D) .NET Compact Framework Answer: B Explanation: Virto Commerce runs on .NET Core (now .NET 6/7), leveraging its cross‑platform capabilities and performance improvements. Question 4. How does Dependency Injection (DI) primarily benefit Virto Commerce modules? A) It eliminates the need for unit tests. B) It allows services to be resolved at runtime, promoting loose coupling. C) It forces all modules to share a single static instance. D) It disables middleware pipelines. Answer: B Explanation: DI enables modules to request abstractions, which the container resolves, fostering loose coupling and easier testing. Question 5. Which component of the ASP.NET Core request pipeline is responsible for initializing Virto’s platform services?
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C) virto module create MyModule D) virto module init MyModule Answer: A Explanation: The virto new module command scaffolds the basic folder structure, manifest, and startup files for a new module. Question 8. In a module manifest, what does the “Dependencies” section define? A) Database tables used by the module B) External NuGet packages only C) Other Virto modules that must be loaded before this one D) UI themes required by the module Answer: C Explanation: Dependencies list other Virto modules that need to be present and initialized prior to the current module. Question 9. Which lifecycle method is called when a module is first installed to apply schema changes? A) Initialize() B) InstallAsync() C) OnStart() D) SeedData()
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Answer: B Explanation: The InstallAsync method runs during module installation, allowing migrations and data seeding. Question 10. What is the recommended way to extend a core service without modifying its source code? A) Fork the core repository and edit the service. B) Create a new class that inherits and replaces the registration in DI. C) Use reflection to replace private methods at runtime. D) Edit the core .csproj file directly. Answer: B Explanation: Overriding core services via DI registration lets you provide a custom implementation while keeping the core untouched. Question 11. Which attribute is used to register a custom repository implementation for a core entity? A) [Repository] B) [Injectable] C) [ScopedService] D) [Service] Answer: C
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Question 14. To handle an event asynchronously, which interface should a handler implement? A) IEventHandler B) IAsyncEventHandler C) IBackgroundTask D) IEventListener Answer: B Explanation: IAsyncEventHandler<T> allows the handler to run asynchronously, suitable for long‑running tasks. Question 15. Which library does Virto Commerce use for background job scheduling? A) Quartz.NET B) Hangfire C) Azure Functions D) Hangfire.Core only for .NET Framework Answer: B Explanation: Hangfire is integrated into Virto for managing recurring and fire‑and‑forget background jobs.
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Question 16. What is the default lifetime of services registered via AddScoped in ASP.NET Core used by Virto? A) Singleton for the entire application. B) Per HTTP request. C) Per thread. D) Transient each time it is requested. Answer: B Explanation: Scoped services are created once per HTTP request, aligning with typical web request lifetimes. Question 17. Which caching strategy is best for storing product catalog data that must be shared across multiple web‑farm nodes? A) In‑Memory cache B. Distributed cache (e.g., Redis) C. File‑based cache D. No cache, always query the DB Answer: B Explanation: Distributed cache like Redis allows cache sharing across nodes, ensuring consistency in a scaled environment. Question 18. When configuring a module’s settings, which scope provides the highest precedence?
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C) Include() D) Load() Answer: B Explanation: AsNoTracking() disables change tracking, and Select projects entities into DTOs, improving performance. Question 21. When extending the User entity with a “PreferredLanguage” field, which configuration must be updated to expose it via the API? A) Swagger definition only B) DTO mapping profile (AutoMapper) C) Connection string D) Startup.cs logging settings Answer: B Explanation: Updating the AutoMapper profile ensures the new property is mapped to the API DTO. Question 22. Which middleware component should be placed early in the pipeline to enable multi‑tenant resolution? A) UseAuthentication B) UseRouting C) UseTenantResolution D) UseStaticFiles
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Answer: C Explanation: UseTenantResolution determines the current tenant based on request data before other processing. Question 23. What is the purpose of the “PlatformSettings” service in Virto? A) To manage UI themes. B) To provide access to configuration values across scopes. C) To handle payment gateway integration. D) To schedule background jobs. Answer: B Explanation: PlatformSettings abstracts retrieval of configuration values respecting hierarchy and scope. Question 24. Which attribute marks a class as a Virto module startup component? A) [Module] B) [VirtoModule] C) [ModuleDependency] D) [Startup] Answer: B Explanation: [VirtoModule] identifies the class that contains module initialization logic.
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A) Use Hangfire’s RecurringJob.AddOrUpdate with Cron.Daily() B) Use a while loop with Thread.Sleep C) Schedule a one‑time job with a 24‑hour delay each time it runs D) Use a timer with 1‑second intervals Answer: A Explanation: Hangfire’s RecurringJob.AddOrUpdate with Cron.Daily() schedules a job to execute daily at midnight. Question 28. Which command publishes a Virto module to a NuGet feed? A) virto publish module MyModule --source https://nuget.org B) dotnet nuget push MyModule.nupkg - s https://nuget.org C) virto nuget push MyModule.nupkg D) dotnet pack MyModule Answer: B Explanation: dotnet nuget push uploads the generated .nupkg to the specified NuGet source. Question 29. What is the effect of registering a service with AddSingleton in Virto’s DI container? A) A new instance per request. B) One instance for the entire application lifetime.
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C) One instance per thread. D) No instance is created until first use. Answer: B Explanation: AddSingleton creates a single instance that lives for the whole application process. Question 30. Which of the following best describes the purpose of the “Event Bus” in Virto? A) To store user session data. B) To route messages between modules and core services. C) To manage database connections. D) To render UI components. Answer: B Explanation: The Event Bus enables decoupled communication by publishing and subscribing to events across modules. Question 31. When adding a new column to the Orders table, which migration method should be used to ensure data is not lost? A) DropTable B) RenameColumn C) AddColumn with default value D) ExecuteSqlRaw without transaction
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Question 34. Which of the following is a recommended practice when overriding a core repository? A) Replace the existing registration with AddTransient. B) Use Decorate pattern to wrap the original repository. C) Delete the core repository class. D) Change the namespace of the core repository. Answer: B Explanation: Decorating allows adding behavior while preserving the original implementation, adhering to Open/Closed principle. Question 35. What does the “PlatformInitializer” middleware primarily configure? A) Static file serving. B) Authentication schemes. C) Platform services, logging, and tenant resolution. D) CORS policies. Answer: C Explanation: It sets up essential platform services, logging, and determines the tenant context early in the request pipeline.
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Question 36. Which tool is most suitable for inspecting the content of a Virto message queue during development? A) SQL Server Management Studio B) RabbitMQ Management UI C) Chrome DevTools D) Postman Answer: B Explanation: Virto can use RabbitMQ for its message bus; the management UI provides real‑time inspection of queues. Question 37. To ensure that a custom field added to the Product entity appears in the admin UI, which component must be extended? A) The product controller only. B) The Angular module responsible for product edit view. C) The database connection string. D) The logging provider. Answer: B Explanation: Admin UI is built with Angular; extending the appropriate module adds the new field to the UI. Question 38. Which of the following is NOT a supported database provider for Virto Commerce out of the box?
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C) Send D) Dispatch Answer: B Explanation: Publish sends the event immediately and processes synchronous handlers. Question 41. When configuring Hangfire in Virto, which storage option is recommended for production environments? A) In‑Memory storage B) SQL Server storage C. XML file storage D. Redis storage only Answer: B Explanation: SQL Server storage provides durability and reliability for Hangfire job data in production. Question 42. Which attribute is applied to a class to indicate it should be discovered as an event handler? A) [EventHandler] B) [MessageHandler] C) [Handler] D) [Subscribe]
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Answer: A Explanation: [EventHandler] marks the class so the platform registers it for the appropriate events. Question 43. In Virto, where are tenant‑specific configuration values stored by default? A) In the tenant’s database schema. B) In a JSON file per tenant. C) In environment variables. D) In the Windows Registry. Answer: A Explanation: Tenant settings are persisted in the tenant’s database, allowing isolation and runtime changes. Question 44. Which of the following best describes the role of “PlatformEvents” in Virto? A) They are UI components for notifications. B) They are domain‑level messages used for decoupled processing. C) They control the HTTP request lifecycle. D) They manage user authentication tokens. Answer: B
