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DNS has been around since the Internet was first developed and has evolved with it. Because of this, the DNS service in Windows Server 2008 can provide a number of roles. There are three possible types of DNS servers:
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Dynamic DNS servers Servers that are designed to accept name registrations from a wide variety of devices through dynamic updates are deemed to be dynamic DNS (DDNS) servers. DDNS is designed to enable devices clients and servers to self-register to the DNS server so that other devices can locate them. When the DNS service runs on a DC and is integrated with the directory service, it runs in DDNS mode, enabling computers that use DHCP to register their own names within it automatically. This enables AD DS to locate the client when it needs to send it management data such as Group Policy objects (GPOs). DDNS servers are read-write servers, but they accept registrations from known entities only.
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Note that the exam does not include direct references to dynamic DNS. It will, however, refer to dynamic updates as well as to Active Directory integrated DNS zones. Any time a DNS server is updated automatically through authorized clients, it is a DDNS. Keep this in mind when taking the exam.
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Read-write DNS servers Earlier DNS servers that are not running in dynamic mode but
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that will accept writes from known sources such as authorized operators are deemed read-write DNS servers. The most common type of read-write DNS server is the primary
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9
Integrating Domain Name System with AD DS
DNS server. Primary DNS servers are usually deployed in perimeter networks and are not integrated with AD DS. Read-only DNS servers DNS servers that hold a read-only copy of DNS data that originates from another location are deemed read-only DNS servers. In Windows Server 2008, there are two types of read-only DNS servers. The first is the secondary DNS server. Secondary DNS servers are linked to primary DNS servers and will accept and host DNS data provided by the primary parent server. They make data available locally but cannot be modified because they support only one-way replication from the primary. A second type of read-only DNS server in Windows Server 2008 is the DNS server that runs on a read-only DC (RODC). These servers run primary read-only zones when integrated with RODCs. Using these three types of DNS servers, you can construct a name resolution strategy that meets all your naming requirements. (See Figure 9-3.) For example, you could pair DDNS servers with every domain controller in your network because the DNS data is usually integrated with the directory store. Because it is contained in the directory store, the DNS data is replicated to every DC in a domain and sometimes in a forest through the same mechanism that replicates directory traffic. This means each DC has a local copy of DNS data. Installing the DNS service on the DC automatically gives it access to this data and can provide local rather than remote name resolution services, avoiding wide area network (WAN) traffic. In addition, you can use the RODC DNS service in read-only mode in unsecured locations within your network, locations that warrant local services but do not have local administrative staff. You can also use the standalone primary DNS service in perimeter networks. These servers contain few records but support access to any application or service you host in your perimeter. Last, you could use read-only secondary DNS servers in unsecured locations facing the Internet.
9
Integrating Domain Name System with AD DS
Internal Network
Perimeter Network
Internal Network
Site C Site A Branch Office
Site D Site B
Legend DDNS Read\Write Primary Read-only Secondary or RODC
Figure 9-3 DNS server placement in a Windows Server 2008 network: DDNS follows DCs, primaries are protected, and RODCs are internal, whereas secondaries are external
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Domain Name System
For more information on DNS, go to http://technet2.microsoft.com/windowsserver2008/en/ servermanager/dnsserver.mspx.
The Split-Brain Syndrome
One of the most basic tenets of internetworking is the segregation of the internal network from the Internet. Small and large organizations alike will endeavor to protect their internal network through a variety of systems and technology. The most common protection mechanism is the firewall, which protects your network by blocking entry of undesirable traffic through the control of TCP/IP ports. Accepted ports are open and all unacceptable ports are closed. It s as simple as that.
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