our 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 the primary DNS zone for contoso.com.You configure a primary zone for west.contoso.com on a DNS server named DNS2 in the branch office. 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. The solution must meet the following requirements: Minimize the amount of DNS zone transfer traffic between the offices.Maintain the current name resolution process for users in the main office. 
What should you configure on DNS1? （）

Your network consists of a single Active Directory domain. You have a DHCP server named DHCP1 that runs Windows Server 2003 Service Pack 2 (SP2).All client computers run Windows XP Service Pack 3 (SP3). All client computers are configured as DHCP clients.You change the IP address on DHCP1.Users report that they cannot connect to the network. You verify that the client computers do not receive an IP address configuration from DHCP1. You need to ensure that the client computers receive an IP address configuration from DHCP1. 
What should you do on DHCP1?（）