Communication transferring of info between source and one or more destinationsInformation knowledge or intelligenceData info stored in digital formData comm transferring of data between source and dest. Often referred to as computer comm because computer peripherals or equipment communicate with each otherNetwork set of devices interconnected1837 invention of telegraph and morse code*morse code uses dots and dashes1844 first telegraph line was established in Baltimore to Washington, DC1849 invention of a slow speed telegraph printer1850 western union telegraph company was established in Rochester, NY1874 emil baudot telegraph multiplexer: up to 6 diff telegraph machines1876 telephone was invented by alexander graham bell1940 special purpose computer bell labs1951 Remington rand corporation Univac (universal automatic computer). First mass produced electronic computer1968 carterfone decision. Possible na connection between non bell labs devicesInternet public data commIntranet private data comm used by companiesWorld Wide Web server based appDte(data terminals/terminating equipment) transmits or receives dataDce(data circuit terminating equipment) transmits or receives digital or analog signals. Conversion from analog to digitalNodes equipment involved in a networkSpeed amount of data that can pass in a medium. BandwidthDelay how fast a data can pass through a medium. LatencyJitter measure of variabilityReliability availability of a network.*fault tolerant how reliable a component or element in a network is*fault tolerant network how resilient a network isSecurity protectionRouter connects to outside LANSwitch central meeting point. Pang-LANLAN limited by a geographical area. For buildingsMAN within 50km radiusWAN not limited by a geo areaSAN connection bet storage devicesPAN up to few meters only. Usb, bluetoothTopology physical connection of a networkBus isang line called busRing naka-bilogStar may central controllerMesh connected lahat ng devicesTree combination of star and busUnicast one sender one receiverMulticast one sender, many receiversBroadcast one sender, all receiversCentralized computing one central mainframe compDistributed computing multiple computers capable of processing independentlyCollaborative computing collaborationProtocol set of rules, networking languageStandards guidelines Layering Modular engg diff hardware and software network can communicateAdvantages of network:Resource sharing, reduced cost and easier installation, workplace flexibility, improved communications and securityDe facto not recognized by regulating bodiesDe jure approved by regulating bodies, lawSG 2 tel nosSG 3 global interconnection ratesSG 5 environmentSG 9 TVSG 11 signallingSG 12 QoSSG 13 NGNSG 15 DSLSG 16 multimediaISO pang lahatan standards. Intl org for standardizationANSI non profit coop. American National Standards InstituteIEEE Intl Electrical and Electronics EngineersIEEE 1901 broadband over power lineIEEE 1076 VHSIC hardware languageIEEE 829 documentationIEEE 1541 prefixesBit binary digitByte set of 8bitsOctet group of 8bytesIEEE 802 networking standardsIEEE 802.3 ethernetIEEE 802.11 wifiIEEE 802.166 - WiMax