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下列隧道协议中工作在网络层的是______。
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协议对在网络中传送的数据进行分组和路由负责将数据从一个节点传送到另一个节点该协议与OSI/RM
SMTP
TCP
IP
IEEE802．3
下列隧道协议中工作在网络层的是______
SSL
L2TP
IPSeC
PPTP
安装Windows2000时TCP/IP网络协议是默认安装的按照OSI协议有关该协议的工作层下面的哪
TCP在会话层进行工作，IP在传输层进行工作
TCP在传输层进行工作，IP在网络层进行工作
TCP在网络层进行工作，IP在传输层进行工作
TCP和IP都在传输层进行工作
在网络协议的各层中相邻层之间的关系是______的关系
IPSec协议和VPN隧道协议工作于网络的同一层次
PPTP
L2TP
GRE
以上都是
构建隧道可以在网络的不同协议层次上实现
透明桥接主要工作在网络协议的哪一层
第1层
第2层
第3层
第4层
在网络协议的各层中相邻层之间的联系是【13】的关系
NetWare中的SPX协议工作在网络七层模型中的哪一层
数据链路层
网络层
传输层
应用层
SSL协议比IPSEC协议的优势在于
实现简单、易于配置
能有效的工作在网络层
能支撑更多的应用层协议
能实现更高强度的加密
有关TCP和UDP协议正确的是
都是工作在Internet层的协议
TCP协议要优于UDP协议
UDP协议相对比较快
在网络中优先使用TCP协议
ARP协议是工作在网络层的协议主要负责将MAC地址解析成IP地址
下列协议中________是在网络层定义的
FTP
RIP
IP
TCP
在网络协议的各层中相邻层之间的关系是【3】的关系
互联网基础协议TCP/IP
不适用于局域网
是一种双层程序（协议）
它们在传输层工作
它们在网络层工作
IGMP协议和IGMPSnooping的区别是
IGMP协议运行在网络层，IGMPSnooping运行在链路层
IGMP协议运行在链路层，IGMPSnooping运行在网络层
IGMP运行在主机和组播路由器之间，用于跟踪、了解主机是哪些组播组的成员
IGMPSnooping工作在二层交换机中，用于将组播报文在二层上进行有目的性转发
在网络协议的各层中相邻层之间的联系是______的关系
虚拟专用网是虚拟私有网络VirtualPrivateNetworkVPN的简称它是一种利用公共网络来
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根据图17-3所给出的网络连接方式及相关的网络参数区域A与区域B中计算机的网络参数配置为区域A计算机IP地址范围1区域A计算机子网掩码2区域A计算机默认网关3区域B计算机IP地址范围4区域B计算机子网掩码5区域B计算机默认网关6
Foreachblankchoosethebestanswerfromthefourchoicesandwritedownontheanswersheet. 21isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication. 22isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. 23functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. 24isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. 25isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI. 22是
BorderGatewayProtocolBGPisinter-autonomoussystem96protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest97countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughannotsecureeventhoughitistheshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutactuallydefiningthepaththatleadstothat98.Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link99routingisalsonotagoodcandidateforinter-autonomoussystemroutingbecauseanInternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrousting100usingtheDijkstraalgorism. 98是
如果该单位有一台需对外发布公共信息的Web服务器应将其接入图17-3的哪个区域
分部1的路由器配置为ethernet0/0端口接内部网络serial0/0端口接外部网络下列配置指定内外网端口完成下列配置将答案填写在答题纸相应的位置Routerconfig#intereth0/0Routerconfig-if#4Routerconfig-if#interserial0/0Routerconfig-if#5Routerconfig-if#exitRouterconfig#
根据图17-3所给出的网络连接方式及相关的网络参数区域A与区域B中计算机的网络参数配置为区域A计算机IP地址范围1区域A计算机子网掩码2区域A计算机默认网关3区域B计算机IP地址范围4区域B计算机子网掩码5区域B计算机默认网关6
根据图17-3所给出的网络连接方式及相关的网络参数区域A与区域B中计算机的网络参数配置为区域A计算机IP地址范围1区域A计算机子网掩码2区域A计算机默认网关3区域B计算机IP地址范围4区域B计算机子网掩码5区域B计算机默认网关6
TraditionalInternetaccessmethodslikedial-upweresoslowthathostcomputerswereconnectedtothedial-up.6atthecustomerpremiseoverslow7ports.PPPwasdesignedtorundirectlyovertheseseriallinks.ButwiththeadventofbroadbandInternet8technologiessuchasADSLandcablemodemstherehasbeenaconsiderableincreaseinthebandwidthdeliveredtotheendusers.Thismeansthatthehostcomputersatthecustomerpremiseconnecttothe9orcable"modem"overamuchfastermediumsuchasEthernet.Italsomeansthatmultiple10canconnecttotheInternetthroughthesameconnection. 10是
Foreachblankchoosethebestanswerfromthefourchoicesandwritedownontheanswersheet. 21isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication. 22isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. 23functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. 24isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. 25isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI. 24是
以下是指定VPN在建立连接时协商IKE使用的策略阅读下面的配置信息解释67处的命令Routerconfig#cryptoisakmppolicy10定义策略为10Routerconfig-isakmp#hashmd56Routerconfig-isakmp#authenticationpre-share7Routerconfig-isakmp#exitRouterconfig#cryptoisakmpkeycisco123address0.0.0.00.0.0.0配置预共享密钥为cisco123对等端为所有IP
IP地址为192.168.0.36的计算机发送到Internet上的IP数据包的源IP地址为9IP地址为202.117.12.36的计算机发送到Internet上的IP数据包的源IP地址为10
BorderGatewayProtocolBGPisinter-autonomoussystem96protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest97countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughannotsecureeventhoughitistheshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutactuallydefiningthepaththatleadstothat98.Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link99routingisalsonotagoodcandidateforinter-autonomoussystemroutingbecauseanInternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrousting100usingtheDijkstraalgorism. 100是
分部1采用DDN通过一台路由器接入Internet阅读下面的路由配置信息将1～3处标识的语句进行解释Router＞en进入特权模式Router#configterminal进入全局配置模式Routerconfig#enablesecretcisco设置特权13令Routerconfig#linevty04Routerconfig-line#passwordgoodbad1Routerconfig-line#exitRouterconfig#interfaceeth0/0进入以太网接口配置模式Routerconfig-if#ipaddress202.117.1.1255.255.255.0设置IP地址和掩码Routerconfig-if#noshutdown启用以太网接口Routerconfig-if#exitRouterconfig#interfaceserial0/0进入串口配置模式Routerconfig-if#ipaddress211.175.132.10255.255.255.252设置IP地址和掩码Ronterconfig-if#bandwidth256指定带宽为256KBRouterconfig-if#encapsulationppp2Routerconfig-if#nocdpenable3Routerconfig-if#noshutdown启用serial接口Routerconfig-if#exitRouterconfig#
TraditionalInternetaccessmethodslikedial-upweresoslowthathostcomputerswereconnectedtothedial-up.6atthecustomerpremiseoverslow7ports.PPPwasdesignedtorundirectlyovertheseseriallinks.ButwiththeadventofbroadbandInternet8technologiessuchasADSLandcablemodemstherehasbeenaconsiderableincreaseinthebandwidthdeliveredtotheendusers.Thismeansthatthehostcomputersatthecustomerpremiseconnecttothe9orcable"modem"overamuchfastermediumsuchasEthernet.Italsomeansthatmultiple10canconnecttotheInternetthroughthesameconnection. 8是
本方案采用DHCP来分配网络地址DHCP是4协议的一个扩展便于客户自动从服务器获取IP地址和相关设置其中实现IP地址动态分配的过程如下①到④未按顺序排列①客户设置服务器ID和IP地址并发送给服务器一个DHCPRequest报文②客户端向服务器广播DHCPDiscover报文此报文源地址为5目标地址为6③服务器返回DHCPACK报文④服务器返回DHCPOffer报文客户收到的数据包中应包含客户的7地址后面跟着服务器能提供的IP地址子网掩码租约期限及DHCP服务器的8地址客户进行ARP检测如果觉得有问题发送DHCPDecline报文如果觉得没有问题就接受这个配置参数～8处空缺的名称填写在相应位置
若备选设备有光网络单元ONU光收发器和交换机为图17-2中ABC选择正确的设备
图17-3中代理服务器还可以用何种网络连接设备实现
Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuseshigh-frequency26wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot27withthecurvatureoftheearththeycanbe28onlyovershortdistance.Thusmicrowaveisagood29forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or30.Thesecanbeinstalledontowershighbuildingsandmountaintops. 30是
分部1采用DDN通过一台路由器接入Internet阅读下面的路由配置信息将1～3处标识的语句进行解释Router＞en进入特权模式Router#configterminal进入全局配置模式Routerconfig#enablesecretcisco设置特权13令Routerconfig#linevty04Routerconfig-line#passwordgoodbad1Routerconfig-line#exitRouterconfig#interfaceeth0/0进入以太网接口配置模式Routerconfig-if#ipaddress202.117.1.1255.255.255.0设置IP地址和掩码Routerconfig-if#noshutdown启用以太网接口Routerconfig-if#exitRouterconfig#interfaceserial0/0进入串口配置模式Routerconfig-if#ipaddress211.175.132.10255.255.255.252设置IP地址和掩码Ronterconfig-if#bandwidth256指定带宽为256KBRouterconfig-if#encapsulationppp2Routerconfig-if#nocdpenable3Routerconfig-if#noshutdown启用serial接口Routerconfig-if#exitRouterconfig#
Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuseshigh-frequency26wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot27withthecurvatureoftheearththeycanbe28onlyovershortdistance.Thusmicrowaveisagood29forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or30.Thesecanbeinstalledontowershighbuildingsandmountaintops. 26是
BorderGatewayProtocolBGPisinter-autonomoussystem96protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest97countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughannotsecureeventhoughitistheshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutactuallydefiningthepaththatleadstothat98.Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link99routingisalsonotagoodcandidateforinter-autonomoussystemroutingbecauseanInternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrousting100usingtheDijkstraalgorism. 96是
DOMisaplatform-andlanguage-41APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented42.DOMisa43-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin44whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge.45documentsthatdonotfitinfothememoryavailableforprocessing. 44是
Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuseshigh-frequency26wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot27withthecurvatureoftheearththeycanbe28onlyovershortdistance.Thusmicrowaveisagood29forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or30.Thesecanbeinstalledontowershighbuildingsandmountaintops. 28是
简述WLAN用户通过RADIUS服务器登录的过程
DOMisaplatform-andlanguage-41APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented42.DOMisa43-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin44whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge.45documentsthatdonotfitinfothememoryavailableforprocessing. 42是
TheBorderGatewayProtocolBGPisaninterautonomoussystem76protocol.TheprimaryfunctionofaBGPspeakingsystemistoexchangenetwork77informationwithotherBGPsystem.ThisnetworkreachabilityinformationincludesinformationonthelistofAutonomousSystemASsthatreachabilityinformationtraverses.BGP-4providesanewsetofmechanismsforsupporting78interdomainrouting.ThesemechanismsincludesupportforadvertisinganIP79andeliminatetheconceptofnetworkclasswithinBGRBGP-4alsointroducesmechanismsthatallowaggregationofroutesincluding.80ofASpaths.Thesechangesprovidesupportfortheproposedsupernetttingscheme. 77是
TraditionalInternetaccessmethodslikedial-upweresoslowthathostcomputerswereconnectedtothedial-up.6atthecustomerpremiseoverslow7ports.PPPwasdesignedtorundirectlyovertheseseriallinks.ButwiththeadventofbroadbandInternet8technologiessuchasADSLandcablemodemstherehasbeenaconsiderableincreaseinthebandwidthdeliveredtotheendusers.Thismeansthatthehostcomputersatthecustomerpremiseconnecttothe9orcable"modem"overamuchfastermediumsuchasEthernet.Italsomeansthatmultiple10canconnecttotheInternetthroughthesameconnection. 6是
TheBorderGatewayProtocolBGPisaninterautonomoussystem76protocol.TheprimaryfunctionofaBGPspeakingsystemistoexchangenetwork77informationwithotherBGPsystem.ThisnetworkreachabilityinformationincludesinformationonthelistofAutonomousSystemASsthatreachabilityinformationtraverses.BGP-4providesanewsetofmechanismsforsupporting78interdomainrouting.ThesemechanismsincludesupportforadvertisinganIP79andeliminatetheconceptofnetworkclasswithinBGRBGP-4alsointroducesmechanismsthatallowaggregationofroutesincluding.80ofASpaths.Thesechangesprovidesupportfortheproposedsupernetttingscheme. 79是
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