You are an Enterprise administrator for contoso.com. The corporate network of the company consists of a single Active Directory forest having 20 domains configured under it.

All the domain controllers on the network run Windows Server 2008 and have the DNS role installed on them. You company has decided to replace a legacy Windows Internet Name Service (WINS) environment with a DNS-only environment for the name resolution.

Which of the following options would you choose to Support IPv4 and IPv6 environments, allow single-label name resolution across all domains, and minimize the amount of NetBT traffic on the network while replacing a legacy Windows Internet Name Service (WINS) environment?

A.
Configure all the DNS zones to perform a WINS forward lookup.

B.
Configure all the DNS zones to replicate as part of a custom Active Directory replication partition.

C.
Configure a GlobalNames zone on each domain controller.

D.
Configure all the DNS zones to replicate to each DNS server in the forest.

E.
None of the above

Explanation:
To Support IPv4 and IPv6 environments, allow single-label name resolution across all domains, and minimize the amount of NetBT traffic on the network while replacing a legacy Windows Internet Name Service (WINS) environment with a DNS-only environment, you need to configure a GlobalNames zone on each domain controller.

The DNS Server Role in Windows Server 2008 now supports the GlobalNames Zone. This has been introduced to assist organizations to move away from WINS and allow organizations to move to an all-DNS environment. Unlike WINS, The GlobalNames zone is not intended to be used for peer-to-peer name resolution.

The GlobalNames Zone (GNZ) is used to hold single-label names. The GlobalNames zone is most commonly used to hold CNAME resource records to map a single-label name to a Fully Qualified Domain Name (FQDN). GNZ provides single-label name resolution whereas WINS provides NetBIOS resolution. If you plan to retire WINS or plan to deploy IPv6 only in your environment, all name resolution will rely on DNS. It supports dual IPv4 and IPv6 environment and use only DNS for name resolution.

Reference: Understanding the New GlobalNames Zone Functionality in Windows Server2008

http://johnpolicelli.wordpress.com/2008/01/15/understanding-the-new-globalnames-zone-in-windows-server-2008/

Reference: DNS Server GlobalNames Zone Deployment / How GNZ Resolution Works

http://download.microsoft.com/download/e/2/0/e2090852-3b7f-40a3-9883-07a427af1560/DNS-GlobalNames-Zone-Deployment.doc.