Final answer:
To configure an alternate DNS server on each domain controller of two different AD forests, the Command Prompt, with commands like netsh or dnscmd, is used to directly add the DNS server addresses.
Step-by-step explanation:
The tool that you can use to configure an alternate DNS server on each domain controller in different Active Directory (AD) forests for hostname resolution is the Command Prompt. While tools like Active Directory Domains and Trusts can manage domain and forest level relationships, the Command Prompt can be utilized for direct DNS server configuration by using commands such as netsh or dnscmd. To ensure that each domain has the other's DNS server information, you would enter commands to add the respective DNS server address as an alternate on the opposing domain's domain controllers.Remember, this is important for allowing the domains to resolve hostnames in the other forest, which is essential for inter-forest communication.To configure an alternate DNS server on each domain controller of both domain forests, you can use the Command Prompt tool.
The Command Prompt allows you to run commands that can modify the network settings, including setting DNS servers. You can use the nslookup command to check the current DNS server configuration and the ipconfig command to set the alternate DNS server. Here is an example:Open Command Prompt.Run the command ipconfig /all to check the current DNS server settings.To set the alternate DNS server, run the command ipconfig /flushdns to clear the DNS cache and then run the command ipconfig /renew to renew the IP configuration with the new DNS server.