Question
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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.
| Name | Location | IP address | Local DNS zone |
|---|---|---|---|
| Server1 | Montreal | 10.0.1.10 | contoso.local |
| Server2 | Toronto | 10.0.2.10 | east.contoso.local |
| Server3 | Seattle | 10.0.3.10 | west.contoso.local |
The contoso.local zone contains zone delegations for east.contoso.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, you create a conditional forwarder for contoso.local and west.contoso.local. On Server3, you create a conditional forwarder for contoso.local and east.contoso.local.
Does this meet the goal?
- A. Yes Correct
- B. No
Explanation
Yes. Server1 hosts contoso.local, which contains delegations for east.contoso.local and west.contoso.local, so Server1 can resolve all three internal namespaces by following the delegations. Server2 and Server3 host only their own child zones and would otherwise send queries for the other internal zones to the internet root servers, which cannot resolve .local names. The conditional forwarders on Server2 (for contoso.local and west.contoso.local) and on Server3 (for contoso.local and east.contoso.local) send those queries to the servers that can answer them. Because all three servers use root hints, they can also resolve internet host names. Therefore every server can resolve all internal namespaces and internet hosts.
