Course: Demystifying DNS

Notes for the Demystifying DNS course: 35 lessons across 8 sections.

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Introduction

• Course Introduction

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Welcome to the World of DNS

• Why DNS
• Demo DNS Queries
• Terminology
• Domain Name Anatomy
• The Root Zone
• Top Level Domain
• Demo Domains and Zones

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DNS as a System

• DNS System or Protocol
• DNS A Distributed System
• DNS Resolvers
• Nameserver
• Walking the DNS Tree
• Time to Live TTL
• Zone Transfer
• Root Servers and Anycast
• GeoDNS

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DNS as a Protocol

• DNS as a Protocol
• DNS Request and Responses
• EDNS
• DoH DoT and DNSSEC

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Record Types

• DNS Record Types Introduction
• SOA and NS Records
• Glue Records
• A and AAAA Records
• CNAMEs
• Other Records txt srv ptr
• MX Records

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Domain Name Lifecycle

• Domain Registration Process
• Negative Caching
• Domain Transfer Zone Transfer
• WHOIS

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Miscellaneous

• Setting Up DNS Monitoring Tools
• Troubleshooting DNS

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Final Project

• Demo Setting Up DNS Server