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Domain Name & Domain Name Server (DNS)

Domain Name & Domain Name Server (DNS). IP = a string of numbers Computers can work on them efficiently But meaningless and difficult to remember for human  Domain Name Give to each host (with IP) for easy identification (by human) Easier to remember. www.yahoo.com Better than

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Domain Name & Domain Name Server (DNS)

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  1. Domain Name & Domain Name Server (DNS) • IP = a string of numbers • Computers can work on them efficiently • But meaningless and difficult to remember for human •  Domain Name • Give to each host (with IP) for easy identification (by human) • Easier to remember

  2. www.yahoo.com Better than 66.218.71.112

  3. Domain Name www.yahoo.com.hk www.info.gov.hk intranet.kcc.edu.hk pta.mst.edu.hk • intranet.kcc.edu.hk

  4. Host Name Sub-domain (Name of server) Generic Code (top-level domain) 2nd level domain (Name of org) Country code (top-level domain) • intranet.kcc.edu.hk

  5. Top-level Domain • Country Code • Indicate the geographical location of the host computer (server) • .ca / .cn / .hk / .jp / .uk / .us • Generic Code • Indicate the type of organization • .com / .edu / .net / .org / .idv / .mil

  6. 2nd -level Domain • Represent the name of the organization • Sub-Domain • Represent the host (server) of the domain • One domain can has many sub-domain • Most common : www • Map to its IP • E.g. 218.188.3.5 = aero.kcc.edu.hk

  7. Domain Name Server • Since • IP is used by computer • Domain Name is more convenient to human • A specialized host • Domain Name Server • Used to translate the domain names into the corresponding IP address • Or vice versa

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