You have a Web server named Web1 that runs Windows Server 2003 Service Pack 2 （SP2）. Users on the internal network connect to the Web site on Web1 by using the URL http：//www.contoso.com. From the Internet， you cannot connect to the Web site by using the URL http：//www.contoso.com. 
You can connect to the Web site by using the public IP address of Web1. You need to ensure that users on the Internet can connect to the Web site on Web1 by using the URL http：//www.contoso.com. You deploy a DNS server that is accessible on the Internet. 
What should you do next？（）

Your company has a main office and one branch office. All servers run Windows Server 2003 Service Pack 2 （SP2）. In the main office， a server named DNS1 hosts a primary DNS zone for contoso.com. In the branch office， you configure a primary DNS zone for west.contoso.com on a server named DNS2.
All servers in the branch office are configured to have the west.contoso.com DNS suffix. You need to ensure that users in the main office can resolve server names in the branch office.You must achieve this goal by using the minimum amount of administrative effort. 
What should you do？（）