I have already installed VS2017 Enterprise 15.6.4. Recently installed .NET Core 2.1.101 SDK from official site
VS2017 Enterprise 15.6.4
.NET Core 2.1.101 SDK
I was expecting .NET Core
.NET Core
Updated to Latest VS 2017 and installed latest .Net Core SDK. Changed global.json to point to latest version installed. This resolved for me.