I will try to explain how I understand the answers.
I think all of us will agree that A is a wrong answer.
You can use CNAME to verify the domain in Azure (I remember that you have this record to provide during setup), but the record designed for the verification is always TXT.
Additionally, you cant use the "asuid" for CNAME, you will get the other ID from the DNS provider.
So answer C is wrong.
TXT record always have the asuid, so answer wrong (that kind of setting as in ans D you can use only with the CNAME record).
In my opinion the right ans is B.
For me the greatest value in ExamTopics is that in the discussions you get explanations in many different ways. Often one of them will make sense to me and then I will have learned something. Because I then understand, I don't need to memorize the answer.
while the answers are often unclear, most of the questions and their options are. if you are unhappy with the quality (probably like most of us are to some extent) you are free to not press reveal answer and think that you have chosen right. or you can do what the rest of us do, pick the answer and review the discussions for vast majority of questions the concrete answer and explanation is in the discussions. it sucks, but as a by product it forcefully teaches you at least something about azure instead of blindly memorizing that question 515 was something about a web address and the answer was B.
From that link : "To add a custom domain to your app, you need to verify your ownership of the domain by adding a verification ID as a TXT record with your domain provider."
Shouldn't that mean the correct answer is actually using the subdomain option :Create a TXT record named contoso.asuid that contains the domain verification ID. (or www.asuid?)
TXT. asuid. The domain verification ID shown in the Add custom domain dialog. App Service accesses the asuid TXT record to verify your ownership of the custom domain.
Azure Web Apps require you to verify ownership of your custom domain before binding it to the web app. This is usually done by creating a TXT record in your domain’s DNS settings.
The TXT record named asuid will contain the domain verification ID, which you will receive from the Azure portal when you try to add a custom domain to your web app.
B: Is Correct and Create a "TXT record" named asuid that contains the domain verification ID. And not Cname or A records.
Because, To configure an Azure web app to host a custom domain like www.contoso.com, the first step is to verify the domain ownership. To ensure that the new domain name actually exist. The "TXT record" is used to prove ownership of the domain by containing the domain verification ID provided by Azure.
This is typically done by creating a TXT record with the domain verification ID provided by Azure.
So, the correct answer is: B. Create a TXT record named asuid that contains the domain verification ID
When creating DNS entries for Azure App Service, create an asuid.{subdomain} TXT record with the Domain Verification ID.
Reference: https://learn.microsoft.com/en-us/azure/security/fundamentals/subdomain-takeover#use-azure-app-services-custom-domain-verification
Before you can point your domain (www.contoso.com) to an Azure Web App (contoso.azurewebsites.net), you need to verify that you actually own the domain. c
1. Obtain Domain Verification ID
In the Azure portal, navigate to your Azure Web App.
Go to the "Custom domains" section.
Azure provides a unique domain verification ID.
2. Create the TXT Record
Log in to your domain registrar's (e.g., GoDaddy, Namecheap) DNS management area.
Add a new TXT record.
The name of this record will be "asuid".
The value of the record should be the domain verification ID you got from Azure.
3. Add CNAME Record (Later)
Once Azure has verified that you own the domain, you'll then need to create a CNAME record named "www" that points to "contoso.azurewebsites.net". This tells the DNS system where to direct web traffic for www.contoso.com.
i believe Answer should be D As A is showing A record which requires IP which is not there. Other 2 records pointing to VerificatioN ID only Option D seems to be correct as it value of contoso
Refer to below
https://azure.github.io/AppService/2017/06/21/Custom-hostnames-with-App-Service.html
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