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The DNS is a distributed database across a hierarchy of networks of servers and provide ways for devices and software (like browsers and email) to query the DNS to get an IP address.
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Domain Name System (DNS) enables you to use hierarchical, friendly names to easily locate computers and other resources on an IP network. The following sections describe the basic DNS concepts, including features explained in newer Requests for Comments (RFCs), such as dynamic update, from the Internet Engineering Task Force (IETF).
The most common use of DNS is mapping domain names to IP addresses. DNS also maps IP addresses to domain names. This is called reverse DNS and it uses the PTR RR type. IPv4 reverse DNS is mapped via a special domain (subtree) called in-addr.arpa. IPv6 reverse DNS is mapped via a special domain (subtree) called ip6.arpa.
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The Instructor’s Manual to accompany A Practical Guide to Advanced Networking, (ISBN: 978-0-132-88303-0) provides the entire book in PDF format along with instructor notes for each section within each chapter, recom-mending key concepts that should be covered in each chapter.
Domain name system (DNS) is a foundational element of internet protocol (IP) communications. The global DNS is effectively a distributed hierarchical database. Each "dot" in a domain name indicates a boundary between tiers in the hierarchy, with each name in between dots denoted as a label.
