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Secondary Servers
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DNS design specifications recommend that at least two DNS servers be used to host each zone. For standard primary zones, a secondary server is required to allow the zone to appear to other DNS servers in the network. Secondary servers provide a means to offload DNS query traffic in areas of the network where a zone is heavily queried and used. Additionally, if a primary server is down, a secondary server provides name resolution in the zone until the primary server is available. The servers from which secondary servers acquire zone information are called mas ters. A master can be the primary server or another secondary server. You specify the secondary server s master servers when the server s secondary zone is created, through either the New Zone Wizard, the Configure A DNS Server Wizard, or command-line tools.
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Secondary servers are best placed as close as possible to clients that have a high demand for names used in the zone. Also, you should consider placing secondary servers across a router, either on other subnets or across wide area network (WAN) links. This setup provides efficient use of a secondary server as a backup in cases where an intermediate network link becomes the point of failure between DNS servers and clients that use the zone.
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Lesson 3
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Deploying DNS Servers
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Stub Servers
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Stub DNS servers host stub zones: abbreviated copies of a zone that contain only a list of the authoritative name servers for its master zone. A DNS server hosting a stub zone attempts to resolve queries for computer names in the master zone by querying these name servers listed. Stub zones are most frequently used to enable a parent zone to keep an updated list of the name servers available in a child zone.
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Caching-Only Servers
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Caching-only servers do not host any zones and are not authoritative for any particular domain. The information they contain is limited to what has been cached while resolv ing queries. In determining when to use this kind of server, note that when it is initially started, it has no cached information. The information is obtained over time as client requests are serviced. However, if you are dealing with a slow WAN link between sites, this option might be ideal because once the cache is built, traffic across the WAN link decreases. DNS queries are also resolved faster, improving the performance of network applica tions. In addition, the caching-only server does not perform zone transfers, which can also be network-intensive in WAN environments. Finally, a caching-only DNS server can be valuable at a site where DNS functionality is needed locally, but administering domains or zones is not desirable for that location.
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Exam Tip When you need to minimize name resolution traffic across WAN links without increasing zone transfer traffic, install a caching-only server.
By default, the DNS Server service acts as a caching-only server. Caching-only servers thus require little or no configuration. To install a caching-only DNS server, complete the following steps: 1. Install the DNS server role on the server computer. 2. Do not configure the DNS server (as you might normally) to load any zones. 3. Verify that server root hints are configured or updated correctly.
Creating Resource Records
New zones contain only two resource records: the start-of-authority (SOA) record cor responding to the zone and a name server (NS) record corresponding to the local DNS server created for the zone. After you create a zone, you must add additional resource records to it. Although some records might be added automatically, others (such as MX and CNAME records) need to be added manually.
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4
Configuring DNS Servers and Clients
To add a resource record for a zone manually, right-click the zone icon in the DNS console and from the shortcut menu, select the appropriate resource record you want to create, as shown in Figure 4-7.
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