The Domain Name System is one of the foundations of the internet. It is the system that allows the translation of human-readable domain names into machines-readable IP addresses and the reverse translation of IP addresses into domain names. This book describes the basic DNS protocol and its extensions; DNS delegation and registration, including for reverse domains; using DNS servers in networks that are not connected to the internet; and using DNS servers on firewall machines. Many detailed examples are used throughout the book to show perform various configuration and administration tasks. Chapter 1 introduces basic DNS concepts, such as domains and subdomains, domain naming syntax, reverse domains, zones, queries, resolvers, name servers, forwarder servers. Chapter 2 explains the DNS protocol, focusing on DNS query. The chapter makes use of several examples of DNS client-server communication. Including an example of a non-existent RR query and its answer, communication with a root server, and TCP and UDP DNS queries. Chapter 3 describes extension to the DNS protocol, including DNS Update, DNS Notify, Incremental Zone Transfer, Negative caching, DNS IPv6 Extension, DNSsec, and TSIG. Chapter 4 discusses name server implementations, focusing on Bind, versions 4, 8, and 9. The use and configuration of the program named is explained in detail. The chapter also discusses the Windows 2000implementation. Chapter 5 covers DNS tuning and administration and tools, such as named-checkconf, named-checkzone, nslookup, dnswalk, dig, and rndc. Chapter 6 focuses on DNS delegation from a primary to secondary servers. The process of domain registration is also explained in the chapter. Chapter 7 talks about the delegation and registration of reverse domains. The internet registry is the subject of Chapter 8. It covers the regional internet registry, division of the world between RIR and country codes, and RIPE database and its various objects. Chapter 9 shows how to configure DNS servers in closed intranets, i.e. networks that are not connected to the internet. It covers configuring a root name server on a separate server (BIND 4) and configuring a name server for the root domain.Chapter 10 covers sharing a DNS database between the Internet and intranet, as well as having separate servers. It also discusses installing name servers on firewalls.

域名系统是互联网的基础之一。它是允许将人类可读的域名翻译成机器可读的IP地址以及将IP地址反向翻译成域名的系统。本书介绍了基本的DNS协议及其扩展；DNS委托和注册，包括反向域名；在没有连接到互联网的网络中使用DNS服务器；以及在防火墙机器上使用DNS服务器。整个书中使用了许多详细的例子来展示执行各种配置和管理任务。第1章介绍了DNS的基本概念，如域和子域、域命名语法、反向域、区域、查询、解析器、名称服务器、转发服务器。第2章解释了DNS协议，重点是DNS查询。该章利用了几个DNS客户-服务器通信的例子。包括一个不存在的RR查询及其答案的例子，与根服务器的通信，以及TCP和UDP DNS查询。第3章描述了对DNS协议的扩展，包括DNS更新、DNS通知、增量区传输、负向缓存、DNS IPv6扩展、DNSsec和TSIG。第四章讨论了名称服务器的实现，重点是Bind，版本4、8和9。对命名程序的使用和配置进行了详细的解释。该章还讨论了Windows 2000的实现。第5章涵盖了DNS的调整和管理以及工具，如named-checkconf、named-checkzone、nslookup、dnswalk、dig和rndc。第6章重点介绍了从主服务器到辅助服务器的DNS委托。该章还解释了域名注册的过程。第7章讲述了反向域名的委托和注册。第8章的主题是互联网注册处。它包括区域互联网注册处、RIR和国家代码之间的世界划分，以及RIPE数据库和它的各种对象。第9章展示了如何在封闭的内部网络中配置DNS服务器，即不与互联网连接的网络。它包括在单独的服务器上配置根域名服务器（BIND 4），以及为根域名配置一个名称服务器。第10章包括在互联网和内网之间共享一个DNS数据库，以及拥有单独的服务器。它还讨论了在防火墙上安装名称服务器的问题。