MIS365 6 - Domain Name System

MIS365 6 - Domain Name System - MIS365 Data Communications...

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MIS365 Jerry Malcolm DNS/Naming
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Review IP Addresses 32 bits “Dot” notation: 192.168.1.1 Ports Equivalent to ‘extension numbers’ for office phones 16 bits Well-known port numbers for standard functions Specify port number as part of fully qualified IP address 192.168.1.1 :1583
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Review You need an IP address… where do you get it? Where did they get it? …and where did they get it? Is there such a thing as a “premium IP address? i.e. are some IP addresses better than others?
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Review IP Addresses All IP addresses are created equal One is just as good as another ISP quality/capability is another story…. A range of IP addresses from one provider might be better than a range of IP addresses from another provider But that is a function of the provider… not the IP address
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Simple vs. Versatile
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Car Repair Sign in a car repair shop: Repairs done: Cheap Fast Correct Pick any 2…
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Business Decisions Similar decision point in business and technology Simple Versatile Your choice… Henry Ford’s approach: “You can have any color car you want… as long as it is ‘black’.”
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Versatility No two individuals are the same No two businesses are the same No two sets of requirements/needs are the same “One size fits all” Most often means nobody gets a really good fit Balance between simplicity and versatility Good business people and designers work toward a mixture of the two But in the purest sense… they are mutually exclusive
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Progression Typical progression This should be really simple… We just need to do ‘x’ and it’s done But what about. ...? OK, just add ‘y’ to fix that And then there’s requirement ‘abc’… OK, I can handle that with…. Is the solution ‘complex’ now? Or is it simply versatile enough to meet the diverse needs of the real world?
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Simple/Complex Keep this is mind as we discuss naming and subsequent topics The ‘simple’ solution alone could not survive in the internet world. Versatility is mandatory
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Naming
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Business Card My Business Joe Smith (512) 555-1212 Email: info@28.131.56.197 http://28.131.56.197 What’s wrong with this picture??
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Numbers… We’ve dealt with phone numbers for several generations But it’s problematic Businesses continually try to be creative to help customer remember their phone number 1-888-899-8989 1-800-I Fly SWA Do we really want to repeat this problem with the internet?
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Alias Names We need an ‘alias name’ system Use alias names to reference assigned IP addresses Easier to remember Branding IP addresses can change w/o changing business cards / brochures / etc Design?
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Requirements Naming Requirements Consistent with general ARPANet objectives Decentralized functionality No centralized servers (or at least - minimal)
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This note was uploaded on 10/20/2011 for the course MIS 365 taught by Professor Malcolm during the Spring '09 term at University of Texas at Austin.

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MIS365 6 - Domain Name System - MIS365 Data Communications...

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