MIS365 5 - TCPIP and Internet

MIS365 5 - TCPIP and Internet - MIS365 Data Communications...

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MIS365 Jerry Malcolm TCP/IP and Internet
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Physical Media Media Protocol Connection Protocol Language Communication Protocol Dialect Vernacular Networking - wire; fiber-optics; radio -Wifi; Ethernet; TokenRing; -WiMax; PicoNet; IP; NetBios; Netware TCP/UDP; LAN Server HTTP; SMTP; POP; SOAP XML; MIME; UUE Message Content
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Review Connection and Communications Layers protocols NetBios TCP/IP Technically – peers Significantly different goals and functionality
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Internet Details Beginning detailed study of ARPANet / TCPIP / Internet ARPANet = Advanced Research Projects Agency Network Many problems need to be solved Componentized solutions Individual sub-systems
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Goals of ARPANet / TCP/IP Decentralized functionality No centralized servers Redundant functionality Architected capability where necessary Maximizing decentralized administration Simple Management Application Extensibility Allow access “to” anything… “from” anything
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Architecture NetBios was top-down design The “App” requirements drove the design Share/use remote printers and files Limited extensibility TCP/IP was bottom-up design Driven by objectives for a ‘generic’ network Highly extensible
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Problem #1 FedEx / UPS / Postal Service… What is the one absolute requirement to ensure that the item arrives at the proper destination? An address that is: Unambiguous Absolute Fully qualified Deterministic The same result today as yesterday Correct
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Internet Addressing First requirement for internet addressing is to design an addressing mechanism to deliver information The address for the destination machine must be: Unambiguous Absolute Deterministic Correct
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Addresses NetBios Used machine ‘names’ Text matching is very inefficient No hierarchy Physical mail addresses are very hierarchical: USA Texas Austin Congress Ave 901 Suite 1001 Mail stop 769 Bob
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Internet Addressing The internet architects chose: A 32-bit number for global addressing 2 32 = 4,294,967,296 Reasonable capability for a long time From a human perspective, discussing individual 32-bit values is difficult Solution 32 bits = 4 8-bit bytes Each byte can be 0-255
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MIS365 5 - TCPIP and Internet - MIS365 Data Communications...

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