Suggested Answer:C🗳️
Every Azure AD directory comes with an initial domain name in the form of domainname.onmicrosoft.com. The initial domain name cannot be changed or deleted, but you can add your corporate domain name to Azure AD as well. For example, your organization probably has other domain names used to do business and users who sign in using your corporate domain name. Adding custom domain names to Azure AD allows you to assign user names in the directory that are familiar to your users, such as "˜[email protected].' instead of 'alice@domain name.onmicrosoft.com'. Scenario: Network Infrastructure: Each office has a local data center that contains all the servers for that office. Each office has a dedicated connection to the Internet. Humongous Insurance has a single-domain Active Directory forest named humongousinsurance.com Planned Azure AD Infrastructure: The on-premises Active Directory domain will be synchronized to Azure AD. References: https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/add-custom-domain
since I'm working with Azure AD for almost 8 years so I want to clear the confusion here.
when you add a custom domain to Azure AD, you have to be the owner of that domain and you can add this domain to a single AD tenant.
there's nothing prevents having the same domain name for the on-premises AD and Azure AD.
in real life, you have already a custom domain name for users emails or published websites and this is the same domain name that you should add to Azure AD.
Therefore the given answer is correct
1. Azure recommends the custom domain name should be unique i.e. between onpremise and Azure.
2. 15 character limit applies to the left most portion of the FQDN. For ex. if domain name is xyz.abcdefghijklmnopq.com, then the the 15 character limit is on xyz not on "abcdefghijklmnopq".
So the correct answer would be "A".
Unique custom domain name here means, the domain name should not be used by other AD tenants because you have to verify that you are the owner of that domain.
Therefore the given answer is correct.
Answer should be A because of 15 character limit
https://docs.microsoft.com/en-us/azure/active-directory-domain-services/tutorial-create-instance#create-a-managed-domain
Look for this
"Domain prefix restrictions: You can't create a managed domain with a prefix longer than 15 characters. The prefix of your specified domain name (such as aaddscontoso in the aaddscontoso.com domain name) must contain 15 or fewer characters."
It's important to understand the difference between Azure AD and Azure AD Domain Services. Those are different things! the 15 character limitation only applies to the Azure AD Domain Services which is an additional custom service in Azure.
Given answer is correct.
should be A.
If you create a custom domain name, take care with existing DNS namespaces. It's recommended to use a domain name separate from any existing Azure or on-premises DNS name space.
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