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NetworkDevices(1-3)NetworkDevices(3-7)virtually['və:tʃuəli]adv.差不多，几乎symbol[‘simbəl]n.标志，符号gateway【计】网关applicationlayer应用层coaxial[kəu‘æksəl]adj.同轴的,共轴的coaxialcable同轴电缆optical['ɔptikəl]adj.光学的,光的fiber[’faibə]n.纤维opticalfiber光纤terrestrial[tə'restri:əl]adj.陆地的;陆地上的terrestrialmicrowave陆地微波satellitemicrowave卫星微波broadcastradio无线电波TCP/IPProtocolassume[ə’sju:m]vt.假定,设想UDP(UserDatagramProtocol)用户数据报协议datagram数据报semantic[si‘mæntik]adj.语义的;语义学的feedback[’fi:dbæk]n.反馈,反馈信息guarantee[,ɡærən’ti:]vt.保证;担保;n.保证,保证书,保证人ICMP(InternetControlMessageProtocol)网际控制报文协议fragment[‘fræɡmənt]n.碎片;片断encapsulate[in’kæpsjuleit]vt.封装intertwine[,intə(:)’twain]vt.,vi.纠缠,缠绕evolve[i'vɔlv]vt.&vi.演变;进化OccupationEnglishLANcommunicationmodemEthernettopologyarchitectureclient-servernetworkpeertopeernetworkmeshbusnetworkloopringnetworkstarnetworkhubporttreenetworkmeshnetworkrepeatertwistedpairamplifyrebroadcastphysicallayerreferencemodelregenerateretimemulti-portbridgestore-and-forwardnetworklayerframeswitchroutersymbolgatewaycoaxialcableopticalfiberterrestrialmicrowaveapplicationlayersatellitemicrowavebroadcastradiotransportlayerdatagramfeedbackencapsulatefragmenttroubleshootencryptioncertifyemergency
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