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在TCP协议中,采用______来区分不同的应用进程。
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在TCP/IP协议分层结构中SNMP是在1协议之上的2请求/响应协议SNMP协议管理操作中管理
TCP
UDP
HTTP
IP
在TCP/IP参考模型中应用层的______协议用来实现互联网中电子邮件发送功能
在TCP/IP参考模型中应用层协议的【13】用来实现互联网中电子邮件传送功能
在UDP和TCP包中头信息中的端口号的作用是
区分同一主机上的多个进程
区分同一主机上的不同服务
区分同一主机上同一服务的不同字节流
区分同一主机上的同一进程的不同字节流
在TCP/IP协议中为了区分各种不同的应用程序传输层使用来进行标识
IP地址
端口号
协议号
服务接入点(SAP)
FTP协议是Internet常用的应用层协议它通过协议提供服务它是基于client/Serve
UDP
TCP
IP
IPX
TCP/IP参考模型中应用层协议的【8】用来实现互联网中电子邮件传送功能
在TCP/IP参考模型中应用层协议的【5】用来实现互联网中电子邮件传送功能
在TCP/IP协议分层结构中SNMP是在1协议之上的2请求/响应协议SNMP协议管理操作中管理
TCP/IP协议族
X.25协议族
帧中继协议族
ATM协议族
在TCP/IP参考模型中应用层协议的【11】用来实现互联网中电子邮件传送功能
在TCP/IP参考模型中应用层协议的______用来实现因特网中电子邮件的传送功能
在TCP/IP参考模型中应用层协议的用来实现互联网中电子邮件传送功能
在TCP/IP网络中SNMP是一种网管协议它是258协议之上的259请求/响应协议在SNMP协
TCP
UDP
HTTP
IP
TCP协议通过IP地址+端口号来区分不同的连接
在TCP/IP网络中SNMP是一种网管协议它是258协议之上的259请求/响应协议在SNMP协议管理
TCP
UDP
HTTP
IP
在TCP/IP传输层的段segment中采用来区分不同的应用进程
端口号
IP 地址
协议类型
MAC 地址
在TCP/IP传输层的段中采用来区分不同的应用进程
端口号
IP地址
协议类型
MAC地址
由于IP地址通常是针对一台主机而言的而在网络应用中一台主机通常会用多个应用程序在使用因此为了区分不同
在TCP/UDP报文中,源端口地址和目标端口地址是不能相同的
在TCP/UDP报文中,源端口地址和目标端口地址是可以相同的,用来表示发回给自己的数据
在TCP/UDP报文中,源端口地址和目标端口地址是可以相同的,因为虽然端口地址一样,但其所在的主机是不同的
以上描述均不正确
TCP/IP参考模型中应用层协议的【】用来实现互联网中电子邮件传送功能
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Inthefollowingessayeachblankhasfourchoices.Choosethemostsuitableonefromthefourchoicesandwritedownintheanswersheet. ThekeytoSNMP76isitssimplicity.Ithasasmallcommandsetthatdoesagoodjobofcollectinginformationfrom77anynetworkdevice.InaSNMPenvironment78oftheworkishandledbythenetworkmanagementsystem.Devicesthatarebeingmanagedarenot79withprocessing80thatmightaffecttheirperformance. 80是
SDLCwasinventedbyIBMtoreplacetheolderBisynchronousprotocolforwideareaconnectionsbetweenIBMequipment.Avarietionofthe71protocolcalledNRMisessentiallythesameasSDLC.SDLCis72protocollikeHDLCFrameRelayorX.25.AnSDLCnetworkismadeupof73thatcontrolsallcommunicationsand74.Itiscapableof75operationbutalmostallpracticalapplicationsarestrictlyhalfduplex. 75是
MultipurposeInternetMailExtensionMIMEisa46documentmessagingstandardintheInternetenviromentwithMIMEuserscansend47Emailmessagesthatincludeaudiovideograph-icesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe48intomessages.Itdefinesthefontsformatsand49featuresofadocumentsothedocumentcanbeeasily50onmanydifferenttypesofsystems. 50是
Foreachblankchoosethebestanswerfromthefourchoicesandwritedownontheanswersheet. 21isasixbytesOSIlayer2addresswhichisburnedintoeverynetworking devicethatprovidesitsuniqueidentityforpointtopointcommunication. 22isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. 23functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. 24isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. 25isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI. 25是
FrameRelayissimplifiedformof51similarinprincipleto52inwhichsynchronousframesofdataareroutedtodifferentdestinationsdependingonheaderinformation. PacketsareroutedthroughtoneormoreVirtualCircuitsknownas53.MostVirtualCircuitsare54whichmeansthatthenetworkprovidersetsupallDLCIconnectionsatsubscriptiontime.55arealsopartoftheFrameRelayspecification.Theyprividealinkthatonlylastsonlyaslongasthesession. 52是
Inthefollowingessayeachblankhasfourchoices.Choosethemostsuitableonefromthefourchoicesandwritedownintheanswersheet. Asocketisbasicallyanendpointofacommunicationlinkbetweentwoapplications.Socketsthatextendoveranetworkconnecttwoormoreapplicationsrunningon31computersattachedtothenet-work.Asocket32twoaddresses:33.Socketsprovidea34communicationchannelbetweenoneormoresystems.Thereare35socketsseparatelyusingTCPandUDP. 32是
6Kb/s的信道按时分多路复用在一条线路上传输如果忽略控制开销在同步TDM情况下复用线路的带宽应该是32在统计TDM情况下假定每个子信道只有30%的时间忙复用线路的控制开销为10%那么复用线路的带宽应该是33
Foreachblankchoosethebestanswerfromthefourchoicesandwritedownontheanswersheet. 21isasixbytesOSIlayer2addresswhichisburnedintoeverynetworking devicethatprovidesitsuniqueidentityforpointtopointcommunication. 22isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. 23functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. 24isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. 25isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI. 21是
码是一些码字组成的集合一对码字之间的海明距离是17一个码的海明距离是所有不同码字的海明距离的18如果要检查出d位错那么码的海明距离是19如果信息长度为5位要求纠正1位错按照海明编码需要增加的校验位是20位以太网中使用的校验码标准是21
在E1载波中每个子信道的数据速率是28E1载波的控制开销占29
MultipurposeInternetMailExtensionMIMEisa46documentmessagingstandardintheInternetenviromentwithMIMEuserscansend47Emailmessagesthatincludeaudiovideograph-icesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe48intomessages.Itdefinesthefontsformatsand49featuresofadocumentsothedocumentcanbeeasily50onmanydifferenttypesofsystems. 46是
多协议标记交换MPLS是一种第三层交换技术MPLS网络由123组成其中124负责为网络流添加/删除标记 124处填
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设信道带宽为3000Hz根据Nyquist定理理想信道的波特率为3波特若采用QPSK调制其数据速率应为4如果该信道信噪比为30dB则该信道的带宽约为5设信道误码率为10-5帧长为10K比特差错为单个错则帧出错的概率为6若整个报文被分成5个帧帧出错的概率为0.1纠错重发以报文为单位则整个报文的平均发送次数约为7次
Foreachblankchoosethebestanswerfromthefourchoicesandwritedownontheanswersheet. 21isasixbytesOSIlayer2addresswhichisburnedintoeverynetworking devicethatprovidesitsuniqueidentityforpointtopointcommunication. 22isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. 23functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. 24isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. 25isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI. 23是
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FrameRelayissimplifiedformof51similarinprincipleto52inwhichsynchronousframesofdataareroutedtodifferentdestinationsdependingonheaderinformation. PacketsareroutedthroughtoneormoreVirtualCircuitsknownas53.MostVirtualCircuitsare54whichmeansthatthenetworkprovidersetsupallDLCIconnectionsatsubscriptiontime.55arealsopartoftheFrameRelayspecification.Theyprividealinkthatonlylastsonlyaslongasthesession. 54是
Inthefollowingessayeachblankhasfourchoices.Choosethemostsuitableonefromthefourchoicesandwritedownintheanswersheet. Asocketisbasicallyanendpointofacommunicationlinkbetweentwoapplications.Socketsthatextendoveranetworkconnecttwoormoreapplicationsrunningon31computersattachedtothenet-work.Asocket32twoaddresses:33.Socketsprovidea34communicationchannelbetweenoneormoresystems.Thereare35socketsseparatelyusingTCPandUDP. 34是
56isaone-wayfunctionthattakesanarbitrarilylongpieceofplaintextandfromitcomputesafixed-lengthbitstring. 57isaprotocolthatmostUSENETmachinesnowuseittoallownewsarticlestopropagatefromonemachinetoanotheroverareliableconnection. 58isanapproachpreferredbycableTVproviders.Inthissolutionthefiberterminatesatanopto-electricalconverterandthefinalsegmentisasharedcoaxialcable. 59isadeviceusedtoconnecttwoseparatenetworkthatusedifferentcommunicationprotocol. 60isadigital-to-digitalpolarencodingmethodinwhichthesignallevelisalwayseitherpositiveornegative. 59是
E1载波的基本帧由32个子信道组成其中30个子信道用于传送话音数据2个子信道60用于传送控制信令该基本帧的传送时间为61
设信道带宽为3000Hz根据Nyquist定理理想信道的波特率为3波特若采用QPSK调制其数据速率应为4如果该信道信噪比为30dB则该信道的带宽约为5设信道误码率为10-5帧长为10K比特差错为单个错则帧出错的概率为6若整个报文被分成5个帧帧出错的概率为0.1纠错重发以报文为单位则整个报文的平均发送次数约为7次
码是一些码字组成的集合一对码字之间的海明距离是17一个码的海明距离是所有不同码字的海明距离的18如果要检查出d位错那么码的海明距离是19如果信息长度为5位要求纠正1位错按照海明编码需要增加的校验位是20位以太网中使用的校验码标准是21
Inthefollowingessayeachblankhasfourchoices.Choosethemostsuitableonefromthefourchoicesandwritedownintheanswersheet. ThekeytoSNMP76isitssimplicity.Ithasasmallcommandsetthatdoesagoodjobofcollectinginformationfrom77anynetworkdevice.InaSNMPenvironment78oftheworkishandledbythenetworkmanagementsystem.Devicesthatarebeingmanagedarenot79withprocessing80thatmightaffecttheirperformance. 76是
SDLCwasinventedbyIBMtoreplacetheolderBisynchronousprotocolforwideareaconnectionsbetweenIBMequipment.Avarietionofthe71protocolcalledNRMisessentiallythesameasSDLC.SDLCis72protocollikeHDLCFrameRelayorX.25.AnSDLCnetworkismadeupof73thatcontrolsallcommunicationsand74.Itiscapableof75operationbutalmostallpracticalapplicationsarestrictlyhalfduplex. 73是
MultipurposeInternetMailExtensionMIMEisa46documentmessagingstandardintheInternetenviromentwithMIMEuserscansend47Emailmessagesthatincludeaudiovideograph-icesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe48intomessages.Itdefinesthefontsformatsand49featuresofadocumentsothedocumentcanbeeasily50onmanydifferenttypesofsystems. 48是
SDLCwasinventedbyIBMtoreplacetheolderBisynchronousprotocolforwideareaconnectionsbetweenIBMequipment.Avarietionofthe71protocolcalledNRMisessentiallythesameasSDLC.SDLCis72protocollikeHDLCFrameRelayorX.25.AnSDLCnetworkismadeupof73thatcontrolsallcommunicationsand74.Itiscapableof75operationbutalmostallpracticalapplicationsarestrictlyhalfduplex. 71是
Inthefollowingessayeachblankhasfourchoices.Choosethemostsuitableonefromthefourchoicesandwritedownintheanswersheet. ThekeytoSNMP76isitssimplicity.Ithasasmallcommandsetthatdoesagoodjobofcollectinginformationfrom77anynetworkdevice.InaSNMPenvironment78oftheworkishandledbythenetworkmanagementsystem.Devicesthatarebeingmanagedarenot79withprocessing80thatmightaffecttheirperformance. 78是
Flowcontrolisafunctionthatpreventsnetworkcongestionbyensuringthat66donotover-whelm67withdata.Therearethreecommonlyusedmethodsforhandlingnetworkcongestion.68isusedbynetworkdevicestotemporarilystoreburstsofexcessdatainmemoryuntiltheycanbeprocessed.69areusedbyreceivingdevicestohelppreventtheirbuffersfromoverflowing.70isaflow-controlschemeinwhichthesourcedevicerequiresanacknowledgmentfromthedestinationafteracertainnumberofpacketshavebeentransmitted. 67是
100BASE-FX采用4B/5B和NRZ-I编码这种编码方式的效率为______
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