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Table of contents

DNS in a Nutshell

The Structure of Domain Names

DNS Name Servers

Example DNS Zones of Authority

Types of Name Servers

Root Name Servers

Resource Records

Reverse Lookup and IN-ADDR.ARPA

Requests and Responses

DNS Request/Response Architecture

DNS Recursion / Iteration Example

DNS Example With Caching

Example Forward and Reverse Lookup

DNS Packet Fields

Question Format

DNS Example: Query

DNS Example: Response

Author: Mike Borella