Presentation: the domain name system

The domain name system (DNS) Skills : none IT concepts : domain, domain name, host, IP address, domain registrar This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

The domain name system (DNS) in context ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Domain names We refer to computers on the Internet (Internet hosts ), by names like: bpastudio.csudh.edu These are called domain names or, if you want to be really geeky, “fully qualified domain names.” The key point is that the name identifies a particular computer – no two hosts have the same domain name.

The parts of a domain name ,[object Object],[object Object],[object Object],bpastudio. csudh . edu A domain is a group of related hosts.

How are these hosts related? ,[object Object],[object Object],[object Object],[object Object],They all belong to educational institutions. They are members of the edu top-level domain (TLD) .

How are these hosts related? ,[object Object],[object Object],[object Object],[object Object],They all belong to the same organization, CSUDH . They are members of the csudh.edu second-level domain .

A unique host bpastudio.csudh.edu This is the domain name of a unique host. It is a member of the csudh.edu domain, but it is the only one with the name bpastudio . It is like a family – all the brothers and sisters have the same last name, but it would be confusing if two of them also had the same first name.

There are a limited number of top-level domains (TLDs), including: ,[object Object],[object Object],[object Object],[object Object],[object Object],These are called “ generic ” TLDs.

There are also country code top-level domain names for every nation, like: ,[object Object],[object Object],[object Object],[object Object],[object Object],These are called “ country code ” top-level domains ( ccTLD s). The organization or host do not necessarily have to be in the country to register the name. For example, .tv is popular everywhere.

Some TLDs use a four-level hierarchy ,[object Object],[object Object],[object Object],[object Object]

Registrars sell domain names ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Regstering a domain – check for availability

Larrypress.com was taken, but these are available and for sale

Getting a name and IP address at CSUDH ,[object Object],[object Object],[object Object]

Some hosts in the csudh.edu domain We are letting muphiepsilon.org use a computer on our campus. IP address Domain name 155.135.55.17 library.csudh.edu 155.135.55.13 home.muphiepsilon.org 155.135.55.11 music1.csudh.edu 155.135.55.8 toro3.csudh.edu 155.135.55.6 vaquero.csudh.edu 155.135.55.2 ns1.csudh.edu 155.135.1.180 email.csudh.edu 155.135.1.166 ctl.csudh.edu 155.135.1.163 sws.csudh.edu

Some hosts in the csudh.edu domain Every domain has a domain name server (DNS). Our DNS is ns1.csudh.edu. It does the IP address lookups for TCP. . IP address Domain name 155.135.55.17 library.csudh.edu 155.135.55.13 home.muphiepsilon.org 155.135.55.11 music1.csudh.edu 155.135.55.8 toro3.csudh.edu 155.135.55.6 vaquero.csudh.edu 155.135.55.2 ns1.csudh.edu 155.135.1.180 email.csudh.edu 155.135.1.166 ctl.csudh.edu 155.135.1.163 sws.csudh.edu

DNS search ,[object Object],[object Object],[object Object]

Food for thought ,[object Object],[object Object],[object Object]

Presentation: the domain name system

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Presentation: the domain name system