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Managing DNS

As already mentioned earlier in the hour, you use the DNS snap-in to both manage DNS and reconfigure it, if necessary. The DNS snap-in enables you to view the records in your DNS zones and add zones to the DNS server. Because records are created dynamically, you can view the records in a particular zone (such as a forward lookup zone) by opening that zone in the DNS snap-in.

For example, to view the resource records in the forward lookup zone, expand the Forward Lookup Zones node and then select one of your forward lookup zones in the snap-in tree. The records contained in the zone appear in the snap-in pane (see Figure 15.10).

Figure 15.10. Zone records can be viewed in the Details pane.

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A number of different resource record types are found in the DNS environment. One type of record is a host record, which is designated as an A record in the DNS environment. A records are found in forward lookup zones. The winjoe1 host or A record is shown in the Details pane of Figure 15.10. You should also notice that other resource record types, such as Start of Authority (SOA) and Name Server (NS), appear in the DNS Details pane. A number of different types of DNS resource records exist; a summary of these types is provided in Table 15.1.

Table 15.1. DNS Resource Record Types
Record Type DNS Snap-In Name and Description
SOA Start of Authority. Identifies the name of the server that is authoritative for data within the domain and that is the first record in the zone database file. It is created automatically when you bring your primary name server online.
NS Name Server. A record is created for each name server assigned to the zone.
A Host. This record provides the mapping of hostname to IP address in a forward lookup zone.
PTR Pointer. This type of record is the converse of an A record and points to a host record. Found in the reverse lookup zone, the PTR record provides for mappings from IP addresses to hostnames.
SRV Service. This type of record shows which services are running on a particular host computer. For example, SRV records could identify the domain controllers on the network.
MX Mail Exchanger. This record type identifies the mail servers on the network and details in what order the mail servers should be contacted.
CNAME Canonical Name or Alias. This type of record is used to create an alias for an existing record. This enables you to point several different names at the same IP address. This is particularly useful for pointing at your web server on the network.
HINFO Host Information. This record type can be used as a sort of low-rent resource-tracking tool for your DNS server. This record can provide information on the CPU, operating system, and other software/hardware information.
WINS WINS. This type of record supplies DNS with the capability to use WINS to help resolve a hostname.

A number of these record types—such as the A (host), SOA, and NS records—are created automatically. The other record types can be created manually within the DNSMGMT snap-in.

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