Deploying DNS in the Enterprise
When you installed Active Directory in Chapter 6, Managing Active Directory, you added a single DNS server on DC1
. When you added a replica DC, DC2
, and when you added the child domain with UKDC1
, you did not set up any additional DNS servers in your forest. In an enterprise organization, this is not best practice. You always want to configure your clients and servers so that they use at least two DNS servers. For servers with a static DNS setting, you should also update the DHCP DNS server option settings to ensure that your DHCP servers also provide two DNS server entries to DHCP clients.
In most organizations, there are several DNS service configuration options you may wish to set. These include whether to allow DNS server recursion on the server, the maximum size of the DNS cache, and whether to use Extended DNS (EDNS).
EDNS (also referred to as EDNS0 or, more recently, EDNS(0)) is an extension mechanism that enables more recent DNS servers...