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Tutorial Overview
Setting up the third DNS server computer
And imagine when someone queries your DNS, your server1 and server2 each gets 50/50 chance (Many DNS illiterate people believe server1 is the one being queried first, then server2, server3 and so on) and are being queried randomly. When a server3 is added, the chance becomes 33/33/33 (forget the round off). Mathematically you should get 66% when one goes down. At the same time, when additional server is added, the down time rate (all 3 combined) goes up.

Creating a new delegated domain name
DNS provides the option of dividing up the namespace into one or more zones, which can then be stored, distributed, and replicated to other DNS servers. When deciding whether to divide your DNS namespace to make additional zones, consider the following reasons to use additional zones: 1 A need to delegate management of part of your DNS namespace to another location or department within your organization.2 A need to divide one large zone into smaller zones for distributing traffic loads among multiple servers, improve DNS name resolution performance.

Connecting to the 3rd new DNS server from the DNS manager
You can use DNS Manager to perform the following basic administrative server tasks: 1- Performing initial configuration of a new DNS server. 2- Connecting to and managing a local DNS server on the same computer or remote DNS servers on other computers. 3- Adding and removing forward and reverse lookup zones, as necessary. 4- Adding, removing, and updating resource records in zones. 5- Modifying how zones are stored and replicated between servers. 6-Modifying how servers process queries and handle dynamic updates. 7- Modifying security for specific zones or resource records.

Adding the third DNS server to the DNS servers list in DNS manager
In addition, you can also use DNS Manager to perform the following tasks: 1-Perform maintenance on the server. You can start, stop, pause, or resume the server or manually update server data files. 2-Monitor the contents of the server cache and, as necessary, clear it. 3-Tune advanced server options. 4-Configure and perform aging and scavenging of stale resource records that are stored by the server. In addition, you can also operate DNS Manager from a workstation to remotely administer DNS servers. You can use DNS Manager only to manage DNS servers running Windows Server operating systems. The console cannot be used to manage other DNS servers, such as BIND servers.