HOTSPOT
You have a server named Server1 that runs Windows Server 2012 R2.
You need to switch Server1 to a Server Core installation of Windows Server 2012 R2.
What command should you run?
To answer, select the appropriate options in the answer area.
Answer: 
answer is incomplete?
Zacker C. – Exam Ref 70-410 Installing and Configuring Windows Server 2012 R2 – 2014
To convert a Windows Server 2012 R2 Server Core installation to the full GUI option, use the following Windows PowerShell command:
Install-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell –Restart
To convert a full GUI server installation to Server Core, use the following command:
Uninstall-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell -Restart
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Not sure you are correct and IMO the given answer is complete
You can switch between a Server Core installation and full installation in Windows Server 2012 because the difference between these installation options is contained in two specific Windows features that can be added or removed. The first feature, Graphical Management Tools and Infrastructure (Server-Gui-Mgmt-Infra), provides a minimal server interface and server management tools such as Server Manager and the Microsoft Management Console (MMC). The second feature, Server Graphical Shell (Server-Gui-Shell), is dependent on the first feature and provides the rest of the GUI experience, including Windows Explorer.
To convert a full installation to a Server Core installation, just remove these two features in Server Manager.
Note that removing the first feature (Server-Gui-Mgmt-Infra), will automatically remove the second.
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This is really confusing.
I checked this book also “Training Guide: Installing and Configuring Windows Server 2012”
It says “To use Windows PowerShell to convert a Server With A GUI installation of Windows Server 2012 to a Minimal Server Interface installation, use this command:
Uninstall-WindowsFeature Server-Gui-Mgmt-Infra -Restart
”
additionally it says “To use Windows PowerShell to convert a Server With A GUI installation of Windows Server 2012 to a Server Core installation, run the following command:
Uninstall-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell -Restart
”
So according to 2 books uninstalling only Server-Gui-Mgmt-Infra feature will convert full GUI version to “Minimal Server Interface” and this is not the same with “Server Core”. Because you have Server Manager in “Server Minimal Interface”. For “Server Core” you need to uninstall 2 features, but I tried it in my virtual environment with uninstalling only Server-Gui-Mgmt-Infra and I ended up with Server Core (Server-Gui-Shell also got uninstalled). Opposite to that I uninstalled only Server-Gui-Shell and ended up to MInimal Server Interface with command prompt and Server Manager.
So books are not correct or what?
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Accordingly to all the resources that I found, removing server-gui-mgmt-infra, won’t remove server-gui-shell, and it will result in a 2012R2 Minimal Server Interface Installation.
As stated in MSDN (https://msdn.microsoft.com/pt-br/library/hh831786(v=ws.11).aspx)
For example, to completely remove Windows Explorer, Internet Explorer, and dependent components, run the following Windows PowerShell command:
Uninstall-WindowsFeature Server-Gui-Shell -Remove
To me, this is incomplete, but, if I find this on the test, I’ll mark only the first one, since everywhere is stating this.
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I will go with
Uninstall-WindowsFeature Server-Gui-Mgmt-Infra
https://blogs.technet.microsoft.com/puneetvig/2012/10/15/switch-between-full-and-server-core-in-windows-server-2012-using-powershell-3-0/
https://blogs.technet.microsoft.com/bruce_adamczak/2013/02/06/windows-2012-core-survival-guide-changing-the-gui-type/
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Full = Shell + mgmt_infra
Minimal = Remove Shell
Core = Remove mgmt_infra
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