You can use Powershell to show the available Windows Features:
Import-Module ServerManager
Get-WindowsFeature | out-file C:\WindowsFeatures.txt -width 300
Because the data is a long and wide it is better to pipe it into a file and review it there.
it shows that '.NET Framework 3.5 Features' are available, but '.NET Framework 3.5 (includes .NET 2.0 and 3.0)' has been removed.
However, the files are still on the DVD, you can use:
dism /online /enable-feature /featurename:NetFX3 /source:D:\sources\sxs /all /LimitAccess
or the PowerShell 'Add-WindowsFeature' commandlet to install it:
Add-WindowsFeature –name NET-Framework-Core -source D:\sources\sxs
Edit: On Server 2012 R2 with Update 1 installed (KB2919355) this doesn't work if you are using the original DVD/ISO. You need a DVD or ISO which includes that update. For new installations, install .NET 3.5 before you apply KB2919355.
Best Answer
Not really. Run
oclistto get a list of "available" (supported) roles and features for Server Core, WSUS isn't one of them.That said, it's mostly possible (but I sure as hell wouldn't do it). Here's a link to a guide on how to force WSUS onto a Server Core 2008 R2 install, but again, I certainly advise against it, and seeing as how you'll have to install a SQL instance on another machine (since MS SQL Server and their internal database require a GUI), the value of doing so seems rather questionable.
EDIT: Turns out that installing MS SQL Server on Server Core is possible, provided you're using MS SQL Server 2012.