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DNS on Windows Server 2003, 3rd Edition
book

DNS on Windows Server 2003, 3rd Edition

by Cricket Liu, Matt Larson, Robbie Allen
December 2003
Intermediate to advanced content levelIntermediate to advanced
416 pages
13h 50m
English
O'Reilly Media, Inc.
Content preview from DNS on Windows Server 2003, 3rd Edition

The Domain Name System in a Nutshell

The Domain Name System is a distributed database. This structure allows local control of the segments of the overall database, yet data in each segment is available across the entire network through a client/server scheme. Robustness and adequate performance are achieved through replication and caching.

Programs called name servers constitute the server half of DNS’s client/server mechanism. Name servers contain information about some segments of the database and make that information available to clients, called resolvers. Resolvers are often just library routines that create queries and send them across a network to a name server.

The structure of the DNS database, shown in Figure 1-1, is similar to the structure of the Windows filesystem. The whole database (or filesystem) is pictured as an inverted tree, with the root node at the top. Each node in the tree has a text label, which identifies the node relative to its parent. This is roughly analogous to a “relative pathname” in a filesystem, like Temp. One label—the null label, or " “—is reserved for the root node. In text, the root node is written as a single dot (.). In the Windows filesystem, the root is written as a backslash (\ ).

The DNS database versus a Windows filesystem
Figure 1-1. The DNS database versus a Windows filesystem

Each node is also the root of a new subtree of the overall tree. Each of these subtrees represents ...

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Publisher Resources

ISBN: 0596005628Supplemental ContentErrata Page