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工业计算机网络课后作业
第一次作业：
WhatisInternet?
Internetisaglobalnetworkconnectionfromthecomputerbyusingthecommonlanguagetocommunicatewitheachother.Onceyouconnecttoanynode,itmeansthatyourcomputerhasbeenconnected to theInternetonline.CurrentusersoftheInternethasbeenallovertheworld,therearemorethanhundredsofmillionsofpeopleusingtheInternet,andthenumberofusersisstillrisingingeometricprogression.
differententitiesin
different
entitiesin
standardsorconventions.Forcommunicationbetween
exchangenetworkestablishedrules,
Data
systems.Two entitiesin order tocommunicate,there must beofthe same
language,and, forthe content of communications,howcommunicationandwhencommunicationmustcomplywithcertainrequirements,theseprovisionsisanagreement.Canalsobesimplydefinedas:asetofrulestocontroldataexchangebetweenthetwoentities.Theconnectionofelectronic
communication,differentlevelshave their ownprotocol.For example,
inthehardwareleveland application-leveldataexchangehas its
ownprotocol.IntheOpen SystemsInterconnection
(OSI)standardmodel,eachlayerhasone totwo
protocols,thecommunicationterminalmustbeabletorecognizeandabidebytheagreement.Theprotocolhasbeendescribedoftenintheformofindustrialorinternationalstandards.
TheNetworkEdg
EDGistheEnhancedDataRatesforGSMEvolution.EDGisaGSMto3Gtransition,it
ismainlyusedintheGSMsystem,anewmodulationmethod,thatisthemost
advancedmulti-slotoperation and8PSK modulation.8PSKGMSK
modulationsignalspaceusedbytheexistingGSMnetworkcanbeextendedfrom2to
8,sotheinformationcontainedineachsymbolisfourtimestheoriginal.
第二次作业：
PleasecomparethedifferencebetweentheCircuitSwitchingandPacket
switching.
Circuitswitchingisthemostbackwardexchangemustfirstestablishacircuitconnection(virtualcircuit),andthenfordataexchange,dataexchan
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