What is CoreFX?

Purpose:

• Unlike the original CLR, the core CLR tries to be as lean as possible. As such the .Net Class libraries are actually contained in the CoreFX. This question prods the depth of the candidate's knowledge about .Net framework developments.

Potential Answer:

The CoreCLR package is actually not very useful on its own. The reason for this is because the CoreCLR package tries to minimize the amount of the class library that it implements. Only types that have a strong dependency on the internal workings of the runtime are included (e.g, System.Object, System.String, System.Threading.Thread, System.Threading.Tasks.Task and most foundational interfaces). 

For the more familiar classes and libraries (System.Collections, System.IO, System.Xml and so on)  are implemented as independent NuGet packages that simply use the .NET Core runtime as a dependency.