Kaplan It 530 Unit 1

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Unit 1: Exploring DNS
Kaplan University

IT 530

July 2, 2013 Unit 1: Exploring DNS
A domain name system (DNS) serves an important role for those who wish to access other networks, which includes websites. DNS allows for users to be able to be able to access Internet websites through a unique name rather than having to memorize a lengthy set of numbers and periods. In addition, DNS allows for the physical hosting location of a network or website to change transparently without anyone noticing. This is more commonly referred to as when a website changes hosts. Furthermore, DNS serves important functions related to mail by allowing users to connect, send, and receive email messages based off of the DNS of the mail server for a specific network (Karrenberg, 2004).
Exploring Hierarchies All domains follow a certain hierarchy top to bottom hierarchy. The order for this hierarchy is:
1. root domain
2. top level
3. second level
4. sub-domain
The root domain is a top-level domain that refers to the Internet. This is mostly maintained by ICANN, which is a private organization that maintain this area. ICANN manages the internet protocol addresses as well as the DNS root zones. ICANN also manages the DNS policy on naming abilities for top level domains ("INETDAEMON.com," 2013).
The level that most users will first visibly notice when connecting to a domain through DNS is the top level domain. In this domain is the area where users will see .com, .net, and .org, which is the extension of most websites. In addition, government websites are also considered top level domains. Government websites can be defined as country code domains or more individualized government coded websites. An example of a country code domain would be .ca, which refers to Canada. In the United States, people can connect to websites such as .gov (government websites), .mil (US…...

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