DRAG DROP
Your network contains an Active Directory forest named corp.contoso.com. All servers run Windows
Server 2012.
The network has a perimeter network that contains servers that are accessed from the Internet by using
the contoso.com namespace.
The network contains four DNS servers. The servers are configured as shown in the following table.
All of the client computers on the perimeter network use Server1 and Server2 for name resolution.
You plan to add DNS servers to the corp.contoso.com domain.
You need to ensure that the client computers automatically use the additional name servers. The
solution must ensure that only computers on the perimeter network can resolve names in the
corp.contoso.com domain.Which DNS configuration should you implement on Server1 and Server2?
To answer, drag the appropriate DNS configuration to the correct location in the answer area. Each DNS
configuration may be used once, more than once, or not at all. Additionally, you may need to drag the
split bar between panes or scroll to view content.
Answer: 
Explanation:
* stub zone
A Stub Zones allows an organization to resolve names to a private namespace or speed up name
resolution to a public namespace without the use of Conditional Forwarders or Secondary Zones.
DNS Stub Zones in each domain will be configured to forward request for the other organization name
space to a DNS server that is authoritative. All other names needing resolved will use the default name
resolution method.
How to configure a DNS Stub Zone in Windows Server
http://blogs.interfacett.com/how-to-configure-a-dns-stub-zone-in-windows-server