DNS - Domain Name Service

• Used to determine IP address for a given URL

• Provided through a group of name servers

  • Databases containing directories of domain names and their corresponding IP addresses

• Large organizations maintain their own name servers

  • smaller organizations rely on name servers provided by their ISPs

• When a domain name is registered, IP address of the DNS server must be provided to registrar for all URLs in this domain

  • Example: Domain name: indiana.edu
    URLs: www.indiana.edu, www.kelly.indiana.edu, abc.indiana.edu

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