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Microsoft AZ-800 Exam - Topic 3 Question 84 Discussion
Topic #: 3
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
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You are planning the deployment of DNS to a new network.
You have three internal DNS servers as shown in the following table.
The contoso.local zone contains zone delegations for east.conloso.local and west.contoso.local. All the DNS servers use root hints.
You need to ensure that all the DNS servers can resolve the names of all the internal namespaces and internet hosts.
Solution: On Server2 and Server3, you configure a conditional forwarder for contoso.local.
Does this meet the goal?
The DNS chapters in Administering Windows Server Hybrid Core Infrastructure describe conditional forwarders as a way to direct queries for specific namespaces to authoritative DNS servers. The text notes: ''A conditional forwarder forwards queries for a designated DNS domain to specified DNS servers,'' which is used to ''integrate split or private namespaces across sites or forests.'' In this design, Server1 hosts contoso.local and delegates east and west to Server2 and Server3. By configuring Server2 and Server3 with a conditional forwarder for contoso.local pointing to Server1, any query for contoso.local (including child names like east.contoso.local or west.contoso.local when not answered locally) is sent to Server1. Server1, being authoritative for the parent, uses the existing delegations to return referrals/answers from the proper child zones. For Internet hosts, all three servers already use root hints, which the course material confirms remains valid alongside conditional forwarding. The documentation also stresses that ''authoritative data is answered locally first; forwarding applies only to names the server is not authoritative for,'' so Server2 continues to answer east locally while leveraging Server1 to reach parent and sibling zones. This configuration ensures that all servers can resolve all internal namespaces and Internet hosts.
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