Your network contains two servers named Server1 and Server2. Both servers run Windows Server
2012 R2 and have the DNS Server server role installed.
On Server1, you create a standard primary zone named contoso.com.
You need to ensure that Server2 can host a secondary zone for contoso.com.
What should you do from Server1?

A.
Add Server2 as a name server.

B.
Create a trust anchor named Server2.

C.
Convert contoso.com to an Active Directory-integrated zone.

D.
Create a zone delegation that points to Server2.

Explanation:
Typically, adding a secondary DNS server to a zone involves three steps:

1. On the primary DNS server, add the prospective secondary DNS server to the list of name servers
that are authoritative for the zone.
2. On the primary DNS server, verify that the transfer settings for the zone permit the zone to be
transferred to the prospective secondary DNS server.
3. On the prospective secondary DNS server, add the zone as a secondary zone.
You must add a new Name Server. To add a name server to the list of authoritative servers for the
zone, you must specify both the server’s IP address and its DNS name. When entering names, click
Resolve to resolve the name to its IP address prior to adding it to the list.
Secondary zones cannot be AD-integrated under any circumstances.
You want to be sure Server2 can host, you do not want to delegate a zone.
Secondary Domain Name System (DNS) servers help provide load balancing and fault tolerance.
Secondary DNS servers maintain a read-only copy of zone data that is transferred periodically from
the primary DNS server for the zone. You can configure DNS clients to query secondary DNS servers
instead of (or in addition to) the primary DNS server for a zone, reducing demand on the primary
server and ensuring that DNS queries for the zone will be answered even if the primary server is not
available.
How-To: Configure a secondary DNS Server in Windows Server 2012
We need to tell our primary DNS that it is ok for this secondary DNS to pull information from it.
Otherwise replication will fail and you will get this big red X.

Head over to your primary DNS server, launch DNS manager, expand Forward Lookup Zones,
navigate to your primary DNS zone, right-click on it and go to Properties.

Go to “Zone Transfers” tab, by default, for security reasons, the “Allow zone transfers: ” is unchecked to protect your DNS information. We need to allow zone transfers, if you value your DNS
records, you do not want to select “To any server” but make sure you click on “Only to servers listed
on the Name Servers tab”.

Head over to the “Name Servers” tab, click Add.

You will get “New Name Server Record” window, type in the name of your secondary DNS server. it
is always better to validate by name not IP address to avoid future problems in case your IP
addresses change. Once done, click OK.

You will see your secondary DNS server is now added to your name servers selection, click OK.

Now if you head back to your secondary DNS server and refresh, the big red X will go away and your
primary zone data will populate.

Your secondary DNS is fully setup now. You cannot make any DNS changes from your secondary
DNS. Secondary DNS is a read-only DNS, Any DNS changes have to be done from the primary DNS.
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