You have an Azure subscription that contains a web app named webapp1. You need to add a custom domain named www.contoso.com to webapp1. What should you do first?
Correct Answer: A
You can use either a CNAME record or an A record to map a custom DNS name to App Service.
You should use CNAME records for all custom DNS names except root domains (for example, contoso.com). For root domains, use A records.
Reference:
https://docs.microsoft.com/en-us/Azure/app-service/app-service-web-tutorial-custom-domain
A) "Create a DNS record"
Reference: https://docs.microsoft.com/en-us/Azure/app-service/app-service-web-tutorial-custom-domain?tabs=a%2Cazurecli#3-create-the-dns-records
A is correct
U can use either a CNAME record or an A record to map a custom DNS name to App Service and as per traditional AD DS, always best use CNAMEs for custom records except the root record
Also as NOTE: dont confuse this app service custom domain with Azure custom domains where the later requires either MX or TXT record
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