Sconfig comes from Server Configuration from Command prompt like CMD or Windows Powershell.
In Windows Server Core Edition the only choice for configuring your Core Windows is Sconfig.exe, after installaing your server the first thing you have to di is configuring your server. Configuration steps are as follows :
Check my TechNet Article about Sconfig.exe configuration on Windows Server Core and GUI edition.
Domain Name System (DNS), defined in several Request for Comments (RFC)documents, performs a single task: translating user-friendly hostnames to IPv4 or IPv6 addresses. The DNS serverin Windows Server 2016 works the same basic way as it does in Windows Server 2012 R2. However, the Windows Server engineering team added some worthwhile enhancements, including DNS policies and Response Rate Limiting (RRL).