Xamarin Certification Xamarin Cross-Platform Architecture 3

Question 1

What is the main benefit of using .NET MAUI over Xamarin.Forms for new projects?

Accepted Answer

Single project with multi-targeting, improved performance, and modern .NET 6+ runtime

Answer

Better Objective-C binding support

Answer

Larger NuGet ecosystem

Answer

Free App Store submission

Question 2

In Xamarin cross-platform development, what does the Platform Abstraction Layer (PAL) concept refer to?

Accepted Answer

A layer of interfaces and adapters that isolates shared code from platform APIs

Answer

A native iOS rendering layer

Answer

The Android HAL equivalent in Xamarin

Answer

A Xamarin NuGet package

Question 3

Which tool is used to profile Xamarin applications for memory and CPU performance?

Accepted Answer

Xamarin Profiler

Answer

Android Studio Profiler only

Answer

Instruments for iOS only

Answer

dotTrace

Question 4

What is the purpose of the Xamarin.Essentials SecureStorage API?

Accepted Answer

Stores key-value pairs securely using platform-native encryption

Answer

Provides encrypted SQLite access

Answer

Manages SSL certificates

Answer

Encrypts network traffic

Question 5

In Xamarin architecture, what is Inversion of Control (IoC) typically used for?

Accepted Answer

Decoupling class dependencies by injecting them rather than hard-coding them

Answer

Reversing navigation flow

Answer

Controlling UI rendering order

Answer

Swapping release and debug builds

Question 6

Which Xamarin feature allows running native Swift or Kotlin code alongside C# code in the same project?

Accepted Answer

Native References

Answer

Binding Libraries

Answer

Interop Services

Answer

DllImport