Configure Network Services - MCSA Windows Server 2012 R2: Installation and Configuration Study Guide - page 99

Each newly delegated zone requires a primary DNS server just as a regular DNS zone
does. When delegating zones within your namespace, be aware that for each new zone you
create, you need to place delegation records in other zones that point to the authoritative
DNS servers for the new zone. This is necessary both to transfer authority and to
provide correct referral to other DNS servers and clients of the new servers being made
authoritative for the new zone.
In Exercise 2.3, you'll create a delegated subdomain of the domain you created back
in Exercise 2.2. Note that the name of the server to which you want to delegate the
subdomain must be stored in an A or CNAME record in the parent domain.

exerCiSe 2.3

Creating a delegated dNS Zone

1.

Open the DNS management snap-in by selecting Server Manager. Once in Server Man-
ager, click DNS on the left side. In the Servers window (center screen), right-click your
server name and choose DNS Manager.

2. Expand the DNS server and locate the zone you created in Exercise 2.2.

3.

Right-click the zone and choose the New Delegation command.

4. The New Delegation Wizard appears. Click Next to dismiss the initial wizard page.

5. Enter ns1 (or whatever other name you like) in the Delegated Domain field of the
Delegated Domain Name page. This is the name of the domain for which you want to
delegate authority to another DNS server. It should be a subdomain of the primary
domain (for example, to delegate authority for farmington.example.net , you'd enter
farmington in the Delegated Domain field). Click Next to complete this step.

6. When the Name Servers page appears, click the Add button to add the name(s) and IP

address(es) of the servers that will be hosting the newly delegated zone. For the pur-
pose of this exercise, enter the server name you used in Exercise 2.2. Click the Resolve
button to resolve this domain name's IP address automatically into the IP address field.
Click OK when you are finished. Click Next to continue with the wizard.

7.

Click the Finish button. The New Delegation Wizard disappears, and you'll see the new
zone you just created appear beneath the zone you selected in step 3. The newly dele-
gated zone's folder icon is drawn in gray to indicate that control of the zone is delegated.

DNS Forwarding

If a DNS server does not have an answer to a DNS request, it may be necessary to send that
request to another DNS server. This is called DNS forwarding . You need to understand the
two main types of forwarding:
External Forwarding When a DNS server forwards an external DNS request to a DNS
server outside of your organization, this is considered external forwarding . For example, a