1. (Choose 1 answer)
Unlike traditional WCF hosted in IIS, a CoreWCF service is typically hosted:
A. In a separate process managed by SvcUtil.exe.
B. As a standalone executable that cannot be hosted in a web server.
C. In a Windows Service only.
D. Within an ASP.NET Core application as middleware.
Đáp án:

2. (Choose 1 answer)
Consider this simple CoreWCF service contract for a.NET 9 application: [ServiceContract] public interface IGreeterService { [OperationContract] string Greet(string name); } Which part defines what the service does?
A. [ServiceContract]
B. public interface IGreeterService
C. [OperationContract]
D. string Greet(string name);
Đáp án:

3. (Choose 1 answer)
How would you access a query string parameter named sort in a controller action?
A. [HttpGet] public IActionResult Get([FromRoute] string sort) {... }
B. [HttpGet] public IActionResult Get([FromBody] string sort) {... }
C. [HttpGet] public IActionResult Get([FromHeader] string sort) {... }
D. [HttpGet] public IActionResult Get([FromQuery] string sort) {... }
Đáp án:

4. (Choose 1 answer)
In an HTTP request, what is the purpose of the Accept header?
A. To indicate which character sets are acceptable for the response.
B. To specify the media type of the resource in the request body.
C. To provide authentication credentials.
D. To inform the server about the media types that the client can understand.
Đáp án:

5. (Choose 1 answer)
In which scenario is a traditional RESTful HTTP/JSON API a better fit than gRPC?
A. For high-throughput, low-latency communication between microservices.
B. When bi-directional streaming is a core requirement.
C. When a strict, language-agnostic contract is required.
D. When building a browser-based client application that needs to directly call the API without a proxy layer.
Đáp án:

6. (Choose 1 answer)
In a controller decorated with [ApiController], what happens automatically if ModelState.IsValid is false?
A. The request is automatically rejected with an HTTP 400 Bad Request response containing details of the validation errors.
B. An HTTP 500 Internal Server Error is returned.
C. The action method still executes as normal.
D. The application logs the error and returns an HTTP 200 OK.
Đáp án:

7. (Choose 1 answer)
A JWT consists of three parts separated by dots (.). What are they in the correct order?
A. Payload, Header, Signature
B. Signature, Header, Payload
C. Header, Payload, Signature
D. Header, Signature, Body
Đáp án:

8. (Choose 1 answer)
How can you disable content negotiation for a specific controller action and force it to return JSON?
A. By returning a string containing serialized JSON.
B. By adding a [Produces("application/json")] attribute to the action method.
C. By configuring it in the Accept header of the response.
D. By removing the [ApiController] attribute from the controller.
Đáp án:

9. (Choose 1 answer)
What is the primary function of an Object-Relational Mapper (ORM) like Entity Framework Core?
A. To enforce security policies on database access.
B. To optimize the network traffic between the API and the client.
C. To translate between objects in object-oriented code (like C#) and data in a relational database.
D. To provide a user interface for database management.
Đáp án:

10. (Choose 1 answer)
To add support for XML serialization in a.NET 8 Web API, what service configuration is typically used in Program.cs?
A. builder.Services.AddMvc().AddXmlSerializerFormatters();
B. builder.Services.AddXmlFormatting();
C. builder.Services.AddControllers().AddXml();
D. builder.Services.AddControllers().AddXmlSerializerFormatters();
Đáp án:

11. (Choose 1 answer)
What is the opposite of a microservices architecture?
A. A service-oriented architecture (SOA)
B. A serverless architecture
C. A monolithic architecture
D. A distributed architecture
Đáp án:

12. (Choose 1 answer)
To use AutoMapper in a.NET 8 API, what is the first step?
A. Add the AutoMapper.Extensions.Microsoft.DependencyInjection NuGet package and register it in Program.cs.
B. Create a static class to hold all mapping logic.
C. Enable it via a setting in appsettings.json.
D. Manually instantiate the Mapper class in every controller.
Đáp án:

13. (Choose 1 answer)
The toupper() and tolower() OData functions are used for:
A. Selecting properties that are all upper or lower case.
B. Ordering results in upper or lower alphabetical order.
C. Case-insensitive string comparisons.
D. Converting a string property to all upper or lower case within a filter or projection.
Đáp án:

14. (Choose 1 answer)
What does the ODataModelBuilder class help you to do?
A. Manually create an Entity Data Model (EDM) using a fluent API.
B. Build a database schema from C# classes.
C. Build OData query URLs dynamically.
D. Generate client-side proxy classes for consuming an OData service.
Đáp án:

15. (Choose 1 answer)
What is the primary reason for using Data Transfer Objects (DTOs) in an API?
A. To shape data specifically for the client, preventing over-posting and under-posting, and decoupling the API from the database schema.
B. To increase the performance of database queries.
C. To enforce business logic and validation.
D. To replace the need for a database.
Đáp án:

16. (Choose 1 answer)
What does gRPC stand for?
A. Graph-based Procedure Calls
B. gRPC Remote Procedure Calls (a recursive acronym)
C. General Routing and Procedure-Calling
D. Google RESTful Procedure Calls
Đáp án:

17. (Choose 1 answer)
What does applying [Authorize] without any parameters to a controller or action do?
A. It denies all access, regardless of who the user is.
B. It defaults to requiring the "Admin" role.
C. It requires that the user be authenticated, but does not check for any specific roles or policies.
D. It allows anonymous access.
Đáp án:

18. (Choose 1 answer)
What is the primary advantage of using the.on() method for event handling?
A. It prevents the default action of the event automatically.
B. It only works for mouse-related events.
C. It can attach event handlers to elements that do not yet exist in the DOM (event delegation).
D. It is shorter to type than.click().
Đáp án:

19. (Choose 1 answer)
What is the primary function of the routing middleware in ASP.NET Core?
A. To manage application configuration and secrets.
B. To match an incoming HTTP request's URL to an executable endpoint (like a controller action or minimal API handler).
C. To handle authentication and authorization for all requests.
D. To serialize and deserialize JSON payloads.
Đáp án:

20. (Choose 1 answer)
To improve read performance for a data-heavy RESTful API, which of the following is an effective scaling strategy?
A. Increasing the complexity of the authorization logic.
B. Using a Content Delivery Network (CDN) or a dedicated cache layer (like Redis) to serve frequently requested data.
C. Writing all log entries to the main database.
D. Compressing the request body.
Đáp án:

21. (Choose 1 answer)
Which of the following questions does "Authorization" answer?
A. What are you allowed to do?
B. Have you been here before?
C. Are you using a valid password?
D. Who are you?
Đáp án:

22. (Choose 1 answer)
How do you restrict access to a controller action to only users in the "Administrator" role?
A. [RequiresRole("Administrator")]
B. [Authorize(UserRole = "Administrator")]
C. [Authorize(Role = "Administrator")]
D. [Authorize(Roles = "Administrator")]
Đáp án:

23. (Choose 1 answer)
What is the fundamental syntax for selecting an HTML element and applying an action in jQuery?
A. element.action()
B. $(selector).action()
C. jQuery(action).selector()
D. select(element).do(action)
Đáp án:

24. (Choose 1 answer)
Compute σ(0), where σ indicates the sigmoid activation function.
A. 0.5
B. 1
C. 0
D. An error is raised.
Đáp án:

25. (Choose 1 answer)
Which communication protocol is often chosen for high-performance, internal, service-to-service communication due to its use of HTTP/2 and binary serialization?
A. REST over HTTP/1.1 with JSON
B. SOAP
C. FTP
D. gRPC
Đáp án:

26. (Choose 1 answer)
Which of the following is a key feature of WCF?
A. It unifies several older Microsoft communication technologies (like ASMX,.NET Remoting, MSMQ) into a single programming model.
B. It only supports communication over HTTP.
C. It is designed exclusively for building RESTful services.
D. It can only be consumed by.NET clients.
Đáp án:

27. (Choose 1 answer)
Which of the following is NOT a core principle of REST?
A. Statelessness
B. Stateful connections
C. Client-Server architecture
D. Uniform Interface
Đáp án:

28. (Choose 1 answer)
Which of the following bindings is designed for high performance,.NET-to-.NET communication on the same machine or across an intranet?
A. WSHttpBinding
B. BasicHttpBinding
C. NetTcpBinding
D. WebHttpBinding
Đáp án:

29. (Choose 1 answer)
What is a major drawback of using purely synchronous communication in a microservice architecture?
A. It creates runtime coupling, meaning if a downstream service is slow or unavailable, the calling service may be blocked or fail.
B. It improves the overall fault tolerance of the system.
C. It increases the loose coupling between services.
D. It is not supported by modern frameworks like ASP.NET Core.
Đáp án:

30. (Choose 1 answer)
How are data types handled differently in Protobuf compared to JSON?
A. Protobuf uses strings for all data types.
B. JSON does not distinguish between integers and floating-point numbers.
C. Protobuf has a well-defined, language-agnostic set of scalar types, and data is validated against this schema during serialization.
D. JSON has a richer set of built-in data types, including Date and Guid.
Đáp án:

31. (Choose 1 answer)
In an OData service with Categories and Products, how would you request all products belonging to the category with an ID of 5?
A. GET /Categories(5)/Products
B. GET /Products/Category(5)
C. Both A and B are typically valid ways to query.
D. GET /Products?$filter=CategoryId eq 5
Đáp án:

32. (Choose 1 answer)
You have an action [HttpPost] public IActionResult Create([FromBody] Product product). Which Content-Type header would you expect from the client?
A. application/x-www-form-urlencoded
B. text/plain
C. text/html
D. application/json or application/xml
Đáp án:

33. (Choose 1 answer)
What is the difference between using PUT and PATCH to modify an OData entity?
A. PUT is asynchronous, PATCH is synchronous.
B. PUT performs a full replacement of the entity, while PATCH performs a partial update.
C. PUT is for partial updates, while PATCH is for full replacements.
D. PUT is used to create entities, PATCH is for updating them.
Đáp án:

34. (Choose 1 answer)
When would you need to create a custom IModelBinder?
A. When you need to bind data from a source not supported by default, or when the binding logic is too complex for standard attributes.
B. Whenever you use a complex type as a parameter.
C. Only when binding data from the request body.
D. It is never necessary to create a custom model binder.
Đáp án:

35. (Choose 1 answer)
How would you request the top 5 most expensive products from an OData service?
A. GET /Products?$limit=5&$orderby=Price asc
B. GET /Products?$top=5&$orderby=Price desc
C. GET /Products?$take=5&$sort=Price desc
D. GET /Products?$top=5&$orderby=Price
Đáp án:

36. (Choose 1 answer)
Which object in a controller contains the results of the model binding and validation process?
A. Request
B. HttpContext
C. ModelState
D. ViewData
Đáp án:

37. (Choose 1 answer)
You have added a new property to a model class in your.NET 8 API using the Code-First approach. What command should you run first to update the database?
A. dotnet watch run
B. dotnet ef database update
C. dotnet restore
D. dotnet ef migrations add AddedNewProperty
Đáp án:

38. (Choose 1 answer)
What is the key difference between HTTP PUT and HTTP PATCH?
A. PUT completely replaces the resource, while PATCH performs a partial update.
B. PUT is idempotent, while PATCH is not.
C. PUT can only be used with JSON, while PATCH supports multiple formats.
D. PUT is used for creating resources, while PATCH is for updating them.
Đáp án:

39. (Choose 1 answer)
Which of the following is a valid JSON object?
A. { name: "John Doe", age: 30 }
B. { 'name': 'John Doe', 'age': 30 }
C. { "name": "John Doe", "age": 30, }
D. { "name": "John Doe", "age": 30 }
Đáp án:

40. (Choose 1 answer)
What is "binding source parameter inference" in controllers marked with [ApiController]?
A. The ability to infer validation rules from property names.
B. A mechanism for the client to tell the server where to find data.
C. A feature where ASP.NET Core automatically applies binding source attributes ([FromBody], [FromRoute], etc.) based on conventions, reducing boilerplate code.
D. The process of guessing the data types of action parameters.
Đáp án:

41. (Choose 1 answer)
What is the purpose of Data Annotations (e.g., [Required], [StringLength]) on model properties in ASP.NET Core?
A. To define the database connection string.
B. To enforce validation rules for the model's data.
C. To specify the controller that uses the model.
D. To add comments to the code for documentation.
Đáp án:

42. (Choose 1 answer)
How do you add Swagger generation and the Swagger UI to your ASP.NET Core 8 application? // In Program.cs builder.Services.AddEndpointsApiExplorer(); builder.Services.AddSwaggerGen(); var app = builder.Build(); if (app.Environment.IsDevelopment()) { // What two lines of code are typically added here? }
A. app.UseExceptionHandler("/error"); app.UseHsts();
B. app.UseSwagger(); app.UseSwaggerUI();
C. app.UseRouting(); app.UseEndpoints(...);
D. app.UseAuthentication(); app.UseAuthorization();
Đáp án:

43. (Choose 1 answer)
Why is it critical to always use HTTPS for RESTful APIs?
A. It is the only protocol that supports the GET and POST verbs.
B. It ensures that the data (including credentials and sensitive information) transferred between the client and server is encrypted and protected from eavesdropping.
C. It automatically handles user authorization.
D. It makes the API faster by compressing the data.
Đáp án:

44. (Choose 1 answer)
Given the following controller, what is the full route template for the GetById action? [ApiController] [Route("api/v1/[controller]")] public class ProductsController: ControllerBase { [HttpGet("{id}")] // e.g. /api/v1/products/123 public IActionResult GetById(int id) {... } }
[Ảnh: PRN232 FA25 FE RE_010_q44_visual.png]
A. [controller]/{id}
B. api/v1/Products/GetById/{id}
C. api/v1/products/{id}
D. api/products/{id}
Đáp án:

45. (Choose 1 answer)
What is an "Entity Set"?
A. The set of properties that make up an entity's key.
B. A set of validation rules for an entity.
C. The schema version of the data model.
D. A named collection of entities of a specific Entity Type, like Products being a collection of Product entities.
Đáp án:

46. (Choose 1 answer)
What does the "ABC" of a WCF endpoint stand for?
A. Address, Binding, Contract
B. Asynchronous, Buffered, Connection
C. Authentication, Authorization, Communication
D. Action, Behavior, Contract
Đáp án:

47. (Choose 1 answer)
To containerize an ASP.NET Core microservice for deployment, what technology is most commonly used?
A. Virtual Machines (VMs)
B. WebDeploy
C. FTP
D. Docker
Đáp án:

48. (Choose 1 answer)
Which of the following best describes a RESTful web service?
A. A web service that uses SOAP for communication.
B. A web service that requires a specific client-side framework.
C. A web service that only returns XML data.
D. A web service that adheres to the architectural principles of REST.
Đáp án:

49. (Choose 1 answer)
What is ASP.NET Core Identity?
A. A simple interface for generating unique IDs.
B. A client-side library for managing user profiles.
C. A membership system that provides services for user authentication and authorization, including user management, password hashing, and role management.
D. The default authentication scheme for Windows Authentication.
Đáp án:

50. (Choose 1 answer)
In the ASP.NET Core Web API pipeline, what is the role of a media type formatter?
A. To handle user authentication and authorization.
B. To log exceptions that occur during request processing.
C. To serialize response data into a specific format (e.g., JSON, XML) and deserialize request data from a specific format.
D. To route incoming HTTP requests to the correct controller action.
Đáp án:

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