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CIT 307 Online Data Communications

CIT 307 Online Data Communications. Domain Name System. Kevin Siminski, Instructor. Module 19. Domain Name System (DNS). DNS- database of databases! Correlation between IP address and a domain name Name space can be flat or Hierarchical. Domain Name Space. Only 128 levels-

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CIT 307 Online Data Communications

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  1. CIT 307 OnlineData Communications Domain Name System Kevin Siminski, Instructor Module 19

  2. Domain Name System (DNS) • DNS- database of databases! • Correlation between IP address and a domain name • Name space can be flat or Hierarchical

  3. Domain Name Space • Only 128 levels- • 0 is the Root level • Should be a structured or hierarchical environment • What would the internet be without DNS?

  4. Domain Name space

  5. Domain names and labels

  6. FQDN and PQDN

  7. Domains

  8. Distribution of Name space(s) • Hierarchy of Name Servers • Zone • Root Server • Primary and Secondary Servers

  9. Hierarchy

  10. Zones and domains

  11. Root Servers • Heart of the Internet • Currently, there are 13 root servers worldwide

  12. Primary and Secondary Servers A primary server loads all information from the disk file; the secondary server loads all information from the primary server.

  13. DNS and the Internet

  14. Generic Domains

  15. Generic domain labels

  16. New Generic domain labels

  17. County domains

  18. Inverse domain

  19. Resolution • Mappint a name to an address or an address to a name is called name-address resolution • Resolver- client/server application • Mapping names to address • Mapping addresses to names

  20. Recursive resolution

  21. Iterative Resolution

  22. Port numbers DNS can use the services of UDP or TCP, using the well-known port 53.

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