Domain Name Servers (DNS) An Introduction

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Domain Name Servers (DNS) An Introduction

• By
• Venkata Krishna Potta
• Date
  Instructor
• 4/10/2007
  Dr. Ravi Mukkamala
  

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Overview

• Definition
• What DNS does?
• Tree structure of DNS
• How it works?
• Conclusion

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DNS

• Definition
• DNS stands for Domain Name Servers. The DNS
  is the system by which all Internet service
  addresses are created, maintained, and used.

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What DNS does ?

• Domain name servers, or DNS, are an incredibly
  important but completely hidden part of the
  internet.
• Domain name Servers translate domain names to IP
  addresses.

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• That sounds like a simple task, and it would be
  -- except for five things
• There are billions of IP addresses.
• There are many billions of DNS requests made
  every day.
• Domain names and IP addresses change daily.
• New domain names get created daily.
• Millions of people work every day.

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How does DNS work ?
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Other functions of DNS

• Hostnames and IP addresses do not necessarily
  match on a one-to-one basis. Many hostnames may
  correspond to a single IP address.
• Mail transfer agents use DNS to find out where to
  deliver e-mail for a particular address.
• To provide resilience in the event of computer
  failure, multiple DNS servers provide coverage of
  each domain.

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Conclusion

• DNS helps us find the hosts without we knowing
  their IP addresses.
• They do this all this with out our knowledge.

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References

• http//sbinfocanada.about.com/od/onlinebusiness/g/
  DNS.htm
• www.weikipedia.org
• www.computer.howstuffworks.com

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• Discussion