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1、CSB051–ComputerNetworks電腦網(wǎng)路Chapter1ComputerNetworksandtheInternet吳俊興國立高雄大學(xué)資訊工程學(xué)系Outline1.1WhatistheInternet?1.2Networkedge1.3Networkcore1.4Accessnetworksandphysicalmedia1.5ISPsandInternetbackbones1.6Delay&lossinpacket-switchednetworks1.7Protocollayersandthei
2、rservicemodels1.8History1-2What’stheInternet:“nutsandbolts”viewAworldwidenetworkthatrouterworkstationinterconnectsmillionsofcomputingdevicesservermobile?millionsofconnectedcomputinglocalISPdevices:hosts=endsystems?routers:forwardpacketsregionalISP(chunksofda
3、ta)?communicationlinksüfiber,copper,radio,satellite?runningnetworkappscompany?protocolscontrolsending,networkreceivingofmsgs1-3What’saprotocol?humanprotocols:networkprotocols:?“what’sthetime?”?machinesratherthan?“Ihaveaquestion”humans?introductions?allcommun
4、icationactivityinInternetgovernedbyprotocols…specificmsgssent…specificactionstakenprotocolsdefineformat,whenmsgsreceived,orderofmsgssentandorothereventsreceivedamongnetworkentities,andactionstakenonmsgtransmission,receipt1-4RFC(RequestforComments)?IETFühttp:
5、//www.rfc-editor.org/rfc-index2.htmlühttp://www.rfc-editor.org/rfcxx00.html?RFC791:IP(InternetProtocol)?RFC793:TCP(TransmissionControlProtocol)?RFC768:UDP(UserDatagramProtocol)?RFC854:TELNET?RFC959:FTP(FileTransferProtocol)?RFC821:SMTP(SimpleMailTransferProt
6、ocol)?RFC1034/1035:DNS(DomainNameSystem)?RFC1939:POP3(PostOfficeProtocol)?RFC2131:DHCP(DynamicHostConfigurationProtocol)?RFC2616:HTTP(HypertextTransferProtocol)?RFC1631:NAT(NetworkAddressTranslator)1-5Outline1.1WhatistheInternet?1.2Networkedge1.3Networkcore1
7、.4Accessnetworksandphysicalmedia1.5ISPsandInternetbackbones1.6Delay&lossinpacket-switchednetworks1.7Protocollayersandtheirservicemodels1.8History1-6Acloserlookatnetworkstructure:?networkedge:applicationsandhosts?networkcore:üroutersünetworkofnetworks?accessn
8、etworks,physicalmedia:communicationlinks1-7Thenetworkedge:?endsystems(hosts):ürunapplicationprogramsüe.g.Web,emailüat“edgeofnetwork”?client/servermodelüclienthostrequests,receivesservicefromalwa
