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Microsoft Certified: Azure Administrator Associate · Microsoft
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A for map host name to IP (VM pubic IP, LB Public IP, App Gw PublicIP) C for DNS to DNS (Azure fn, Azure SWA, App Service) NS for Subdomain MX for mail exchange PTR - Reverse lookup IP → Name mapping ( email servers)
A is right
A. Create an NS record named research in the adatum.com zone. To delegate a subdomain named research.adatum.com to a different DNS server in Azure, you should create an NS (Name Server) record named "research" in the adatum.com zone. The NS record is used to delegate authority for a subdomain to a different set of name servers. By creating an NS record named "research" in the adatum.com zone and specifying the name server(s) for the subdomain, you can delegate the management of the research.adatum.com subdomain to the specified DNS server(s) in Azure.