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Implementing a DNS Infrastructure
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6. Which of the following is not a benefit of storing DNS zones in the Active Direc tory database a. Less frequent transfers b. Decreased need for administration c. Less saturation of network bandwidth d. Secure dynamic updates
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Lesson Summary
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When you deploy a DNS server on a domain controller, you can choose to store the zone data in the Active Directory database. Active Directory integrated zones minimize zone transfer traffic, improve security, decrease administrative overhead, and improve fault tolerance. Zone data can be configured to be replicated among all DNS servers in the Active Directory forest, among all DNS servers in the Active Directory domain, among all domain controllers in the Active Directory domain, or among all servers enlisted in a custom application directory partition. When a DNS zone allows dynamic updates, certain DNS client computers can reg ister and update their resource records with a DNS server. When secure dynamic updates are required in the zone, only the owner of the record can update the record. Secure dynamic updates can be required only on Active Directory integrated zones. Client computers running Windows 2000, Windows XP, and Win dows Server 2003 can perform dynamic updates. The DnsUpdateProxy group is typically used for DHCP servers performing dynamic DNS updates on behalf of other computers. Members of this group do not record ownership on the resource records they register in DNS. This behavior restriction prevents problems from arising in zones that allow only secure dynamic updates. The Start Of Authority (SOA) tab allows you to configure the zone s SOA resource record and several parameters that affect zone transfers, such as Refresh Interval, Retry Interval, Expires After, and Minimum (Default) TTL. The Zone Transfers tab allows you to control transfers from the current zone. By default, zone transfers are either completely disabled or limited to servers speci fied on the Name Servers tab. The nature of this restriction depends on the zone type and the manner in which the DNS server has been installed.
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Configuring Advanced DNS Server Properties
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Lesson 3: Configuring Advanced DNS Server Properties
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Advanced DNS server properties refer to the nine settings that can be configured on the Advanced tab of the DNS server properties dialog box. These properties relate to server-specific features such recursion, round robin, and netmask ordering.
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After this lesson, you will be able to
Describe the function and purpose of all of the options available for configuration on the
Advanced tab of the DNS server properties dialog box
Reset all advanced server settings to defaults
Estimated lesson time: 50 minutes
Tuning Advanced Server Options
When initialized for service, DNS servers running on Windows Server 2003 apply installation settings taken either from the boot information file, the Registry, or the Active Directory database. You can modify these settings on the Advanced tab of the server properties dialog box in the DNS console, as shown in Figure 5-27.
Figure 5-27
DNS server properties Advanced tab
The server installation settings include six server options, which are either on or off, and three other server features with various selections for configuration. Table 5-2 shows the default settings for all nine features.
5-44
5
Implementing a DNS Infrastructure
Table 5-2
Default DNS Installation Settings
Setting Off
Off
Multibyte (UTF8)
From Active Directory And Registry
Off (requires configuration when enabled)
Property Disable Recursion
BIND Secondaries
Fail On Load If Bad Zone Data
Enable Round Robin
Enable Netmask Ordering
Secure Cache Against Pollution
Name Checking
Load Zone Data On Startup
Enable Automatic Scavenging Of Stale Records
In most situations, these installation defaults are acceptable and do not require modi fication. However, when needed, you can use the DNS console to tune these advanced parameters and accommodate special deployment needs and situations.
Exam Tip
These options are heavily tested on the 70-291 exam. Be especially familiar with Disable Recursion, BIND Secondaries, Enable Round Robin, and Enable Netmask Ordering.
You can restore these default settings at any time using the Advanced tab by clicking Reset To Default. To restore DNS server default preferences, complete the following steps: 1. Open the DNS console. 2. In the console tree, right-click the applicable DNS server, and then select Properties. 3. In the server properties dialog box, click the Advanced tab. 4. Click Reset To Default, and then click OK. The following sections describe the available installation options in more detail.
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