HOTSPOT
You have an Azure Web App that uses the URL contoso.azurewebsites.net. The virtual IP address of the web
app is subject to change.
Users must be able to navigate to a custom domain name to access the Web App. You set up the DNS records
for a custom domain at a third party registrar.
You need to configure the web app to use the custom domain name.
For each mapping, which DNS record type should you create? To answer, select the appropriate DNS record
type from each list in the answer area.
Hot Area:
Answer: 
Explanation:
https://azure.microsoft.com/en-gb/documentation/articles/web-sites-custom-domain-name/
Answer should be wrong. A record maps IP address and IP is here subject to change.
From the documentation: “Some domain registrars only allow you to map subdomains when using a CNAME record, such as http://www.contoso.com, and not root names, such as contoso.com”.
So, CNAME can be used for root domains as well, in general.
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The answer given is correct.
Generally we apply A record to root domain. As the IP subject to change, we can login the DNS registar to change it later. No point to put CNAME for root domain here.
https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain
https://docs.microsoft.com/en-us/azure/cloud-services/cloud-services-custom-domain-name#understand-cname-and-a-records
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first question part Root domain you can not add NS as you are using Third party registrar DNS then you can not add NS you will use Third pary NS or CNAME no need for root domain then only A record is available
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I had this question on the exam, but the custome domain was mapped to contoso.yourdomain.com
so only the CNAME record was needed.
within azure there is never any needto create a record to _.azurewebsite.net. azure does this for you
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WEB APPS Custom Domains:
Subdomain: Type=CNAME www -> contoso.azurewebsites.net
Root Domain (contoso.com): Type=A @ -> IP and also needs Type=TXT @ -> contoso.azurewebsites.net
Wildcard (*.contoso.com): Type=CNAME * -> contoso.azurewebsites.net
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What’s more, SOME new 243Q 70-533 dumps for your reference:
https://drive.google.com/open?id=0B-ob6L_QjGLpfnV3MVl6X3pXOWw1Z3YtQUpJRVRiTkNkbGNFbVBNRXhjSkw3bWk1WHdYcW8
Best Regards!
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