NuGet Packages issues on the Build Server

Hi ,

The NuGet packages, Can I get some information on the NuGet Feeds, where we need to  create a local folder in C drive and reference the NuGet Feeds to local, this works mostly for the BuildServers where the external sites are blocked, How does this work on the buildServer and does this NuGet Feeds help for the .NET Core 1.0 projects. Please let me know whether it use full or not.

Thanks,

info2m