Domain Name Service (DNS)

• Developed by Postel & Mockapetris

• www.internic.net is a good site to browse

• The phone book of the internet

  • But more restrictive …. Each entry must be
    • Unique
    • Authentic
  • Universal Resolvability (Domain name <=> IP addresses) is ensured
  • Distributed Database

Phone book:

Tibbs, Richard … 831-5780

Tibbs, Richard … 831-6700

Tibbs, Deborah … 831-5780

DNS system:

Tibbs.Rick.com … 192.168.1.1

Tibbs.Rick.com … 192.168.1.2

Tibbs.Deb.com … 192.168.1.1

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