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Benefits of Using Domain Name System (DNS)

Benefits of Using Domain Name System (DNS). DNS names are user friendly. DNS names are more consistent than IP addresses. DNS allows the same naming convention as the Internet. Domain Name Space. Examples of Second-Level Domains. Ed.gov Microsoft.com Stanford.edu W3.org. Host Names.

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Benefits of Using Domain Name System (DNS)

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  1. Benefits of Using Domain Name System (DNS) • DNS names are user friendly. • DNS names are more consistent than IP addresses. • DNS allows the same naming convention as the Internet.

  2. Domain Name Space

  3. Examples of Second-Level Domains • Ed.gov • Microsoft.com • Stanford.edu • W3.org

  4. Host Names • Refer to specific computers on the Internet or an intranet • The leftmost portion of a fully qualified domain name (FQDN), such as Computer1.sales.microsoft.com • Does not have to match the computer name

  5. Domain Naming Guidelines • Limit the number of domain levels. • Use unique names. • Use simple names. • Avoid lengthy domain names.

  6. Domain Naming Guidelines (continued) • Use standard DNS characters and Unicode characters • Microsoft Windows 2000 supports A–Z, a–z, 0–9, hyphen (-) • Supports Unicode character set

  7. Zones

  8. Name Servers • Store the zone database file • Store the database file(s) for one or multiple zones • Have authority for the domain name space that the zone encompasses • Are required in every zone

  9. Primary Zone Database File • A name server in each domain contains the master database file. • Changes to a zone are performed on it. • Multiple name servers act as a backup.

  10. Benefits of Multiple Name Servers • Provide zone transfers • Provide redundancy • Improve access speed • Reduce the load

  11. Name Resolution • Resolving names to IP addresses • DNS resolves www.microsoft.com to an IP address

  12. Forward Lookup Query

  13. Name Server Caching

  14. Reverse Lookup Query • Maps an IP address to a name. • Used by troubleshooting tools such as the nslookup utility. • Some applications implement security based on the ability to connect to names.

  15. The in-addr.arpa Domain

  16. Introduction to DNS Clients • DNS is a distributed database used in TCP/IP networks. • TCP/IP must be installed to use DNS.

  17. Internet Protocol (TCP/IP) Properties Dialog Box

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