Microsoft Azure Administrator (AZ104) Practice Exam

What action should you take to resolve the name resolution issue for www.contoso.com to the IP address 131.107.1.10?

1. Modify the name server at the domain register

2. Add an NS record to the Azure DNS zone

3. Update the A record in the Azure DNS zone

4. Flush the DNS cache on the local machine

The correct answer is: Modify the name server at the domain register

To resolve the name resolution issue for www.contoso.com to the IP address 131.107.1.10, modifying the name server at the domain registrar is the appropriate action. This is because the name server is responsible for directing DNS queries for your domain to the correct DNS zone where your DNS records are stored. When you register a domain, you set the authoritative name servers where DNS records are maintained. If www.contoso.com is expected to resolve to an IP address managed in Azure DNS, you must ensure that your domain registrar is configured to use the Azure DNS name servers. This step allows queries for the domain to reach the DNS records defined in Azure, including the A record pointing to 131.107.1.10. While other options may address different aspects of DNS management, they would not resolve a name resolution issue resulting from the domain registrar not pointing to the correct name servers. For instance, simply adding an NS record or updating an A record in the Azure DNS zone would not correct the overarching problem of misconfigured name servers at the registrar. Similarly, flushing the DNS cache on the local machine addresses local resolution issues rather than ensuring that DNS queries are directed to the appropriate DNS service.