Your network contains an Active Directory forest. The forest contains two domains named contoso.com and corp.nwtraders.com. The network contains a Web server named server1.contoso.com. All client computers run Windows 7. You need to ensure that users in corp.nwtraders.com can connect to server1.contoso.com by using http://server1. What should you do?

A.
From the Default Domain Policy Group Policy object (GPO) of corp.nwtraders.com, configure Primary DNS Suffix Devolution.

B.
From the Default Domain Policy Group Policy object (GPO) of corp.nwtraders.com, modify the DNS suffix search list.

C.
From the DNS servers in corp.nwtraders.com, configure a conditional forwarder for contoso.com.

D.
From the DNS servers in corp.nwtraders.com, configure a root hint for contoso.com.

Explanation:
For this type of name resolution you need to add a DNS suffix of domains to the DNS Suffix search list to every IP settings of LAN Connections /Advanced settings of IPVx ->DNS Tab/ so Domain Policy GPO shoould be used for that. GlobalNames Zone Alias (CNAME) could do the thing with NEtBios resolution either. 😉
http://technet.microsoft.com/en-us/library/ee382323(WS.10,printer).aspx