Webinars on DNS

Webinars on DNS

ICANN (Internet Corporation for Assigned Names and Numbers) and NIC.LV hosted a series of webinars on the development, governance, and security of the domain name system (DNS). All four webinars were accessible online via Zoom and led by ICANN’s Technical Engagement Manager David Huberman.

ICANN is a governing body that works to standardize and maintain the naming system used for the worldwide web. ICANN's mission is to help ensure a stable, secure, and unified global Internet.

Here is more information about all 4 webinars and their recordings:

“DNS 101”

This course provides an overview of how the Domain Name System (DNS) works and how different DNS components interact with each other. The training covers the following topics:

  • A Brief History of DNS
  • The Name Space, Delegation, Zones
  • Components for the DNS: Authoritative Servers, Resolvers (Stub & Recursives)
  • Root Server System 101
  • DNS Data: Zone Files, RR Types, Glue
  • DNS Security Overview

Video recording: (~1h)


This course provides an overview of ICANN’s technical mission. Beyond the policy development coordination role for the community, ICANN plays a significant role coordinating the technical aspects of the Internet’s unique identifier system. Course Outline:

  • ICANN Ecosystem
  • Introduction to Unique Identifiers
  • Numbers: IANA function & the RIR System
  • Protocol Parameters: IANA function and The IETF
  • Names: DNS, DNS Resolution, Root Server System
  • The Registry/Registrar/Registrant model
  • Security, Stability, and Resiliency: DNSSEC, Compliance, OpSec
  • Policy Development Processes and Stakeholder Engagement

Video recording: (~1h)


The History of the Root Server System is a 30-minute informal lecture that takes the audience from the beginnings of the DNS in 1983 through the present day. It focuses on the development of the Root Server System from just one root server to today’s 13 root servers. It explains some of the mystery behind why the root servers are assigned the way they are. It highlights the status of root service in the local region. Finally, it discusses the next steps in Root Server System governance.

Video recording: (~30min)


This course covers the best practices in securing the overall ecosystem of DNS, from the threats to mitigation perspective. At the end of the course, you will be able to understand the best practices in securing the DNS. Course outline:

  • Introduction: An Example Attack
  • Refresher: Inter-domain Routing 101
  • Refresher: DNS Resolution 101
  • Common Attacks: Cache Poisoning, Fast Flux, Homographic Attacks, Emojis, IoT, etc.
  • Mitigation with DNSSEC
  • Mitigation with RPKI
  • Mitigation with Request Data Encryption DNS (Stub–>Resolver)
  • Mitigation with DMARC, SPF, or DKIM
  • Collaborating with ICANN

Video recording: (~2h)