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 and Server3, you configure a conditional forwarder for contoso.local.
Does this meet the goal?
- A. Yes Correct
- B. No
Explanation
Yes. Server1 hosts contoso.local, and that zone has delegations for east.contoso.local and west.contoso.local, so Server1 can resolve names in all three internal namespaces by following the delegations to Server2 and Server3. When Server2 and Server3 have a conditional forwarder for contoso.local that points to Server1, they send every query for contoso.local and its subdomains to Server1. A query from Server2 for a name in west.contoso.local matches the contoso.local forwarder, and Server1 resolves it through the west delegation. Each server answers queries for its own zone authoritatively, and all the servers resolve internet hosts through root hints. Conditional forwarders from a child zone to its parent, combined with delegations from the parent to the children, is a supported design, so every DNS server can resolve all the internal namespaces and internet hosts.
