思科第一学期 总复习 中文题目 英文答案
思科CCNA1第八章试题及答案英文版
1. 1. QuestionWhat is a result of connecting two or more switches together?o The number of broadcast domains is increased.o The size of the broadcast domain is increased.o The number of collision domains is reduced.o The size of the collision domain is increased.2. 2. QuestionRefer to the exhibit. How many broadcast domains are there?CCNA1 v6.0 Chapter 8 Exam 005o 1o 2o 3o43. 3. QuestionWhat are two reasons a network administrator might want to create subnets?(Choose two.)o simplifies network designo improves network performanceo easier to implement security policieso reduction in number of routers neededo reduction in number of switches needed4. 4. QuestionRefer to the exhibit. A company uses the address block of 128.107.0.0/16 for its network. What subnet mask would provide the maximum number of equal size subnets while providing enough host addresses for each subnet in the exhibit?CCNA1 v6.0 Chapter 8 Exam 007o 255.255.255.0o 255.255.255.128o 255.255.255.192o 255.255.255.224o 255.255.255.2405. 5. QuestionRefer to the exhibit. The network administrator has assigned the LAN of LBMISS an address range of 192.168.10.0. This address range has beensubnetted using a /29 prefix. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the newnetwork (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the properties of the workgroup server to allow connectivity to the Internet?CCNA1 v6.0 Chapter 8 Exam 004o IP address: 192.168.10.65 subnet mask: 255.255.255.240, default gateway: 192.168.10.76o IP address: 192.168.10.38 subnet mask: 255.255.255.240, default gateway: 192.168.10.33o IP address: 192.168.10.38 subnet mask: 255.255.255.248, default gateway: 192.168.10.33o IP address: 192.168.10.41 subnet mask: 255.255.255.248, default gateway: 192.168.10.46o IP address: 192.168.10.254 subnet mask: 255.255.255.0, defaultgateway: 192.168.10.16. 6. QuestionIf a network device has a mask of /28, how many IP addresses are available for hosts on this network?o 256o 254o 62o 32o 16o 147. 7. QuestionWhich subnet mask would be used if 5 host bits are available?o 255.255.255.0o 255.255.255.128o 255.255.255.224o 255.255.255.2408. 8. QuestionHow many host addresses are available on the network 172.16.128.0 with a subnet mask of 255.255.252.0?o 510o 512o1022o 1024o 2046o 20489. 9. QuestionHow many bits must be borrowed from the host portion of an address to accommodate a router with five connected networks?o twoo threeo fouro five10. 10. QuestionA network administrator wants to have the same network mask for allnetworks at a particular small site. The site has the following networks and number of devices:IP phones – 22 addressesPCs – 20 addresses neededPrinters – 2 addresses neededScanners – 2 addresses neededThe network administrator has deemed that 192.168.10.0/24 is to be the network used at this site. Which single subnet mask would make the most efficient use of the available addresses to use for the four subnetworks?o 255.255.255.0o 255.255.255.192o 255.255.255.224o 255.255.255.240o 255.255.255.248o 255.255.255.25211. 11. QuestionA company has a network address of 192.168.1.64 with a subnet mask of255.255.255.192. The company wants to create two subnetworks that would contain 10 hosts and 18 hosts respectively. Which two networks wouldachieve that? (Choose two.)o 192.168.1.16/28o 192.168.1.64/27o 192.168.1.128/27o 192.168.1.96/28o 192.168.1.192/2812. 12. QuestionA network administrator is variably subnetting a network. The smallestsubnet has a mask of 255.255.255.248. How many usable host addresses will this subnet provide?o 4o 6o 8o 10o 1213. 13. QuestionRefer to the exhibit. Given the network address of 192.168.5.0 and a subnet mask of 255.255.255.224 for all subnets, how many total host addresses are unused in the assigned subnets?CCNA1 v6.0 Chapter 8 Exam 001o 56o 60o 64o 68o7214. 14. QuestionRefer to the exhibit. Considering the addresses already used and having to remain within the 10.16.10.0/24 network range, which subnet address could be assigned to the network containing 25 hosts?CCNA1 v6.0 Chapter 8 Exam 002o 10.16.10.160/26o 10.16.10.128/28o 10.16.10.64/27o 10.16.10.224/26o 10.16.10.240/27o 10.16.10.240/2815. 15. QuestionA network administrator needs to monitor network traffic to and fromservers in a data center. Which features of an IP addressing scheme should be applied to these devices?o random static addresses to improve securityo addresses from different subnets for redundancyo predictable static IP addresses for easier identificationo dynamic addresses to reduce the probability of duplicate addresses 16. 16. QuestionWhich two reasons generally make DHCP the preferred method of assigning IP addresses to hosts on large networks? (Choose two.)o It eliminates most address configuration errors.o It ensures that addresses are only applied to devices that require apermanent address.o It guarantees that every device that needs an address will get one.o It provides an address only to devices that are authorized to be connected to the network.o It reduces the burden on network support staff.17. 17. QuestionA DHCP server is used to assign IP addresses dynamically to the hosts on anetwork. The address pool is configured with 192.168.10.0/24. There are 3 printers on this network that need to use reserved static IP addresses from the pool. How many IP addresses in the pool are left to be assigned to other hosts?o 254o251o 252o 25318. 18. QuestionRefer to the exhibit. A company is deploying an IPv6 addressing scheme for its network. The company design document indicates that the subnet portion of the IPv6 addresses is used for the new hierarchical network design, with the s ite subsection to represent multiple geographical sites of the company, the s ub-site section to represent multiple campuses at each site, and thes ubnet section to indicate each network segment separated by routers. With such a scheme, what is the maximum number of subnets achievedper sub-site?CCNA1 v6.0 Chapter 8 Exam 003o 0o 4o16o 25619. 19. QuestionWhat is the prefix for the host address 2001:DB8:BC15:A:12AB::1/64?o 2001:DB8:BC15o 2001:DB8:BC15:Ao 2001:DB8:BC15:A:1o 2001:DB8:BC15:A:1220. 20. QuestionConsider the following range of addresses:2001:0DB8:BC15:00A0:0000::2001:0DB8:BC15:00A1:0000::2001:0DB8:BC15:00A2:0000::…2001:0DB8:BC15:00AF:0000::The prefix-length for the range of addresses is /6021. 21. QuestionMatch the subnetwork to a host address that would be included within the subnetwork. (Not all options are used.)CCNA1 v6.0 Chapter 8 Exam 0122. 22. QuestionRefer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. (Not all options are used.)CCNA1 v6.0 Chapter 8 Exam 006。
思科认证英文题库300-410
Exam : 300-410Title : Implementing Cisco EnterpriseAdvanced Routing andServicesVendor : CiscoVersion : DEMONO.1 An engineer configured the wrong default gateway for the Cisco DNA Center enterprise interface during the install.Which command must the engineer run to correct the configuration?A.sudo maglev-config updateB.sudo maglev install config updateC.sudo maglev reinstallD.sudo update config installAnswer: ANO.2 Which command displays the IP routing table information that is associated with VRF-Lite?A.show ip protocols vrfB.show run vrfC.show ip route vrfD.show ip vrfAnswer: CNO.3 Which statement about IPv6 RA Guard is true?A.It does not offer protection in environments where IPv6 traffic is tunneled.B.It is not supported in hardware when TCAM is programmed.C.It cannot be configured on a switch port interface in the ingress direction.D.Packets that are dropped by IPv6 RA Guard cannot be spanned.Answer: ANO.4 While troubleshooting connectivity issues to a router, these details are noticed:*Standard pings to all router interfaces, including loopbacks, are successful.*Data traffic is unaffected.*SNMP connectivity is intermittent.*SSH is either slow or disconnects frequently.Which command must be configured first to troubleshoot this issue?A.show interface | inc dropB.show ip routeC.show policy-map control-planeD.show policy-mapAnswer: CNO.5 Refer to the exhibit.Why is the remote NetFlow server failing to receive the NetFlow data?A.The flow exporter is configured but is not used.B.The destination of the flow exporter is not reachable.C.The flow monitor is applied to the wrong interface.D.The flow monitor is applied in the wrong direction.Answer: BNO.6 A network engineer is investigating a flapping (up/down) interface issue on a core switch thatis synchronized to an NTP server. Log output currently does not show the time of the flap. Which command allows the logging on the switch to show the time of the flap according to the clock on the device?A.service timestamps log uptimeB.clock calendar-validC.clock summer-time mst recurring 2 Sunday mar 2:00 1 Sunday nov 2:00D.service timestamps log datetime localtime show-timezoneAnswer: D。
思科ITE章考试原题及答案图文稿
思科ITE章考试原题及答案图文稿思科I T E章考试原题及答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）清洁计算机内部可以减少以下哪种负面环境因素？灰尘在清洁计算机机箱内部时，直接喷射压缩空气容易损坏下列哪种组件？风扇在生产车间，一个家具工厂用笔记本电脑来实现进程监控和报告。
生产车间的环境温度大约为27 摄氏度（80 华氏度）。
湿度相当高，大约为70%。
风扇安装在通风口顶部。
这里的木屑灰尘非常多。
以下哪个条件最可能对在这一环境中使用的笔记本电脑产生不利影响？灰尘蔬菜罐头工厂使用笔记本电脑来监控生产线。
生产环境的环境温度大约是 24 摄氏度（75 华氏度）。
湿度约为 30%。
由于装罐设备的使用，因此噪音很高。
笔记本电脑放在一个木箱中，木箱三面距离笔记本电脑较近。
以下哪个因素最可能对在这一环境中使用的笔记本电脑产生不利影响？放置笔记本电脑的木箱科考队正在用笔记本电脑工作。
科学家们工作地点的温度范围为 -13 华氏度（-25 摄氏度）到 80 华氏度（27 摄氏度）。
湿度约为 40%。
噪声水平较低，但地形崎岖，风速可达每小时 45 英里（每小时 72 公里）。
在需要时，科学家们会停下脚步，用笔记本电脑输入数据。
下列哪一项条件最有可能对于在此环境下使用的笔记本电脑造成负面影响？温度以下哪一项是制定预防性维护计划的一部分？记录每项维护任务的详细信息和频率技术人员正在施工现场执行 PC 硬件维护。
作为预防性维护计划的一部分，技术人员应该执行什么任务？进气风扇除尘。
以下哪项任务应作为硬件维护例行程序的一部分？检查并固定任何松动的电缆。
在测试导致某个问题的若干可能原因时，应该首先测试哪类原因？最容易最明显的原因在解决计算机问题时可以使用下列哪两项物品来帮助制定行动计划（选择两项。
）计算机手册计算机维修历史记录日志为客户排除计算机故障之前应该备份哪两类数据（选择两项。
集美大学思科网络技术上级实验题目及答案翻译
实验1：第一章测试1 Which of the following are functions of a web browser without the addition of plug-ins? [Choose three.]（cde）下列哪项是一个没有插件的web浏览器的功能？解释：连接、接触服务器，请求、接受信息a. displays Quicktime movies 显示Quicktime电影b. displays flash animation 显示flash动画c. requests information .请求信息d. contacts web servers 接触web服务器e. receives information 接收信息f. updates IRQ…s更新IRQ的2 Why were TCP/IP protocols developed?（a）为什么TCP / IP协议开发?a. To allow cooperating computers to share resources across a network 允许合作的计算机通过网络共享资源b. To insure that error correction of each packet takes place. 对每个数据包发生的误差修正。
c. To allocate resources that are needed for operating a computer on a LAN. 在局域网内分配那些需要操作的电脑的资源d. To determine the "best path" decision making when forwarding packets of data.确定“最佳路径”转发数据包时的决策3 In an 8 bit binary number, what is the total number of combinations of the eight bits?（b）在一个8位二进制数,八个比特的组合的总数吗? 解释：0(0000 0000) - 255(1111 1111)a. 255b. 256c. 512d. 128e. 254f. 10244 Which statements best describe a physical connection? [Choose two.]哪个陈述最好的形容物理连接。
思科计算机网络题目及翻译3
实验报告用纸课程计算机网络基础日期2014 年5 月4日班级学号姓名成绩实验题目:实验4：第六七八章测试一、实验目的1.掌握Frame定义2.掌握以太网的相关知识二、实验内容1.What does a switch build as it reads MAC addresses that pass through it?交换机构建下列哪张表，通过它可以读取MAC地址？选择一项：a. Routing Topology table路由拓扑表b. Store and Forward list存储和转发列表c. MAC Route Address table MAC地址表d. Content Addressable Memory table内容可寻址存储表e. Cut-through domain直通域正确答案是：Content Addressable Memory table2.Which switching mode results in the lowest amount of latency and provides no error checking?下面哪种交换转发模式具有最低的延迟，但不提供错误的检查？选择一项：a. synchronous同步b. fragment-free无碎片转发c. cut-through 贯通转发d. store-and-forward存储转发正确答案是：cut-through3.What will a bridge do if it receives a frame with a MAC address that is not within the table?如果网桥收到一个MAC地址并不在表内的数据帧，将会如何处理？选择一项：a. ignore frame忽略数据帧b. send frame to appropriate port 发送到适当的端口c. discard frame丢弃帧d. send frame to all ports except source port 泛洪到除源端口外的其他端口正确答案是：send frame to all ports except source port4.Which of the following is a term associated with replacing hubs with switches to increase the number of collision domains?下列哪项是长期与交换机，以增加冲突域的数量代替集线器相联？选择一项：a. extended扩展b. encapsulation封装c. layered model分层模型d. latencye. broadcast domain广播域f. segmentation 分割正确答案是：segmentation5.Which of the following are not to be exceeded when implementing the 5-4-3-2-1 Rule? (Choose three.)下列哪项是实施5-4-3-2-1规则时不超过？（选择三项。
思科 cisco 课后习题答案
分界点：
19． 调制解调器： 语音调制解调器将计算机生成的数字信号转换为可通过公共电话网络的模拟线路传输的语音 频率； 速度越快的调制解调器（如有线电视调制解调器和 DSL 调制解调器）在传输时使用的带宽频 率也越高。 CSU/DSU： 数字线路（如 T1 或 T3 线路）需要信道服务单元（CSU）和数据服务单元（DSU） ； 这两者经常合并到一台设备中，名为 CSU/DSU； CSU 端接数字信号， 并通过纠错和线路监视确保连接的完整性； DSU 在 T 载波线路帧和 LAN 能够解释的帧之间进行转换。 接入服务器： 集中处理拨入和拨出用户通信。接入服务器可同时有模拟和数字接口，能够同时支持数百名 用户。 WAN 交换机： 运营商网络中使用的多端口互连设备。这些设备通常交换帧中继、ATM 或 X.25 等数据流。 路由器： 提供用于连接服务提供商网络的网络互联接口和 WAN 接入接口。 这些接口可以是串行接口或其他 WAN 接口。有些类型的 WAN 接口需要通过 DSU/CSU 或调制 解调器（模拟、有线电视或 DSL）等外部设备将路由器连接到服务提供商。 20. X.25： 一种低带宽的老式 WAN 技术，最大速度为 48kbit/s，读卡器通常使用拨号模式 X.25 向中央 计算机验证事务； 对这些应用来说，低带宽和高延时并不是问题，而低成本让 X.25 成为众家之选； 很多服务提供商已使用帧中继代替 X.25。 一种第 2 层 WAN 协议，通常提供 4Mbit/s 或更高的数据速度； 使用虚电路提供永久、共享的中等带宽连接，可同时传输语音和数据； VC 由 DLCI 唯一标识，这确保两台 DTE 设备之间能够进行双向通信。 异步传输模式（ATM）技术是一种基于信元而不是帧的架构，使用 53 字节的定长信元； 这些小型定长信元非常适合传输对延迟敏感的语音和视频数据流。
思科第一学期期末试题目及答案
1请参见图示。
主机 A 用户向主机 B 用户发送了一封电子邮件。
主机 A 发送了哪种类型的信息？广播组播同播单播2为了将PC 加入到网络环境中，应通过软件配置哪两个组件？（选择两项。
）MAC 地址IP 地址内核外壳(shell)子网掩码3哪两项是MAC 地址的特征？（选择两项。
）指示网络中主机的物理位置。
由DHCP 服务器动态分配。
以十六进制格式显示。
是物理地址。
是一种基于电缆的地址。
4哪种连接需要使用直通电缆？PC 端口至PC 端口PC 端口至路由器接口交换机端口至路由器端口交换机端口至交换机端口5路由器在收到包含广播MAC 地址的帧时会执行什么操作？它不会将该帧转发给另一个网络。
它会以其IP 地址作为回复将该帧转发回发送主机。
它会将帧从除该帧所在接口的其它所有接口转发出去。
它会将该帧转发回接收接口，以确保局域网中的所有主机都能收到。
6DNS 服务器的功能是什么？将IP 地址映射为MAC 地址。
将计算机或域名转换为相应的IP 地址。
管理客户端所在的域。
接收从客户端发来的HTTP 请求。
7哪两种网络故障与物理层相关？（选择两项。
）电缆和接头损坏编址不正确子网掩码不正确组件过热默认网关不正确8哪一层是主机进入网络的第一个进入点？核心层接入层网络层分布层9下列哪些是私有IP 地址的地址范围？（选择三项。
）10.0.0.0 到10.255.255.255200.100.50.0 到200.100.25.255150.150.0.0 到150.150.255.255172.16.0.0 到172.31.255.255192.168.0.0 到192.168.255.255127.16.0.0 到127.31.255.25510请参见图示。
一家组织的安全策略允许员工在家里连接办公室内部网。
这是一种什么安全策略？合理使用事件处理网络维护远程访问11请参见图示。
将Linksys 集成路由器上的安全模式设置为WEP 有什么作用？WEP 安全模式能够使接入点向客户端告知它的存在。
思科网络第一学期1-5章中文测试题及答案
ENetwork Chapter 2 - CCNA Exploration: 网络基础知识(版本4.0) 1在封装过程中，数据链路层执行什么操作？不添加地址。
添加逻辑地址。
添加物理地址。
添加进程的端口号。
2TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包3数据链路层封装添加的报尾信息有何主要功能？支持差错校验确保数据按照顺序到达确保送达正确目的标识本地网络中的设备帮助中间设备进行处理和路径选择4请参见图示。
下列哪组设备仅包含终端设备？A、C、DB、E、G、HC、D、G、H、I、JD、E、F、H、I、JE、F、H、I、J5OSI 模型各层从最高层到最低层的正确顺序如何？物理层、网络层、应用层、数据链路层、表示层、会话层、传输层应用层、物理层、会话层、传输层、网络层、数据链路层、表示层应用层、表示层、物理层、会话层、数据链路层、传输层、网络层应用层、表示层、会话层、传输层、网络层、数据链路层、物理层表示层、数据链路层、会话层、传输层、网络层、物理层、应用层6下列哪三项陈述是对局域网(LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。
此类网络由由一个组织管理。
LAN 中的不同网段之间一般通过租用连接的方式连接。
此类网络的安全和访问控制由服务提供商控制。
LAN 为同一个组织内的用户提供网络服务和应用程序访问。
此类网络的每个终端通常都连接到电信服务提供商(TSP)。
7第4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务8以下哪种特征正确代表了网络中的终端设备？管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径9请参见图示。
哪个术语正确判断出了包含于绿色区域中的设备类型？源终端传输中间10OSI 模型哪两层的功能与TCP/IP 模型的网络接入层相同？（选择两项）网络层传输层物理层数据链路层会话层11请参见图示。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
1请参见图示。
根据显示的配置信息，哪三类802.11网络可以访问该WLAN？（选择三项）802.11a802.11b802.11e802.11g802.11n802.11x2下列哪一项是对DNS最准确的描述？DNS servers are used to map an IP address to a physical address.DNS servers are used to map a name to an IP address.DNS servers are used to configure logical address information for host computers.DNS servers are used to translate from private addresses to public addresses.请参见图示。
在Linksys集成路由器上安装什么功能可以将私有IP地址转换为可路由的Internet地址？身份验证DHCP加密防火墙NAT WEP4下面哪些是TCP/IP模型的传输层协议？（选择两项。
）FTP UDP SMTP TFTP TCP5下列哪一项准确描述了分布层中的网络设备？They are designed to interconnect individual hosts.They are designed to interconnect multiple companies。
They are designed to interconnect local network segments.They are designed to switch data packets as fast as possible.6在本地网络中，计算机要想成功连接网络，哪两项必须是唯一的？（选择两项。
）I P address subnet mask computer name default gateway addressoperating system version7下列关于本地和网络应用程序的陈述，哪三项是正确的？（选择三项）A local application is loaded in a local computer and can be accessed by a remote computer on the network.A network application is loaded in a local computer and accessed from a remote computer.A local application is loaded in a local computer and accessed only by the local computerA network application is loaded in a local computer and accessed only by the local computerAn example of a local application is e-mail.A n example of a network application is instant messaging.8一台主机发送报文，本地网络上的所有其它主机接收并处理该报文。
请问所有这些主机属于哪种类型的域？local domain multicast domain collision domain broadcast domain9客户与ISP之间规定正常运行时间和服务响应时间要求的合同名称是什么？DSL IAB NAP SLA10请参见图示。
假设图中显示的是连接到Linksys集成路由器的主机的输出。
应该首先检查下列哪一项？IP address on the host IP address on the routersubnet mask on the host default gateway on the hostlink status LED on the front of the router11“衰减”一词在数据通信中是什么意思？loss of signal strength as distance increasestime for a signal to reach its destinationleakage of signals from one cable pair to anotherstrengthening of a signal by a networking device12下列哪些是私有IP地址的地址范围？（选择三项。
）10.0.0.0to10.255.255.255200.100.50.0to200.100.25.255150.150.0.0to150.150.255.255172.16.0.0to172.31.255.255192.168.0.0to192.168.255.255127.16.0.0to127.31.255.25513下列哪两项正确描述了媒体访问控制(MAC)地址？（选择两项。
）MAC addresses are used to identify a specific NICMAC addresses are physical addresses。
MAC addresses contain a network number and unique host identification.MAC addresses are always assigned to network devices by a network administrator。
MAC addresses can be dynamically assigned.14路由器在收到包含广播MAC地址的帧时会执行什么操作？It will not forward the frame to another network.It forwards the frame back to the sending host with its IP address as a response.It forwards the frame out of all interfaces except the interface where the frame was received.It forwards the frame back out the receiving interface to insure all hosts on the local network receive it.15在考虑购买新的操作系统时，“总拥有成本”意味着什么？applications and support costshardware and support costshardware and software costshardware, software, and support costshardware, operating system, and applications costs16下列哪两项属于存储外围设备？（选择两项。
）printer flash drive headphones external DVD barcode reader17ISP是什么？It is a standards body that develops cabling and wiring standards for networking.It is a protocol that establishes how computers within a local network communicate.It is an organization that allows individuals and businesses to connect to the Internet.It is a networking device that combines the functionality of several different networking devices in one.18请参见图示。
在Network Name字段中分配名称Academy有何作用？It identifies the wireless LAN.It translates IP addresses into easy-to-remember domain names.It encrypts data between the wireless client and the access point.It allows access to the AP configuration GUI by name rather than address.It translates an internal address or group of addresses into an outside, public address. 19单个AP覆盖的区域称为什么？ad-hoc network basic service set independent basic service setextended service set distribution system20如果当前操作系统受到损坏而无法正常运行，那么应该选择哪种安装方案？upgrade multi-boot clean install virtualization21交叉电缆如何实现两台“类似设备”（例如两台交换机）的通信？The transmit pins are disconnected and only the receive pins are used.The transmit pins on one device are connected to the transmit pins on the other device.The receive pins on one device are connected to the receive pins on the other device.The transmit pins on one device are connected to the receive pins on the other device.22下面是TCP/IP数据封装从源主机传送到目的主机的步骤，其中哪一项是正确的顺序？A. converts data to bits for transmissionB. packages the data for end to end transportC. adds the data-link header and trailerD. adds the network IP address to the header of the frameA,B,C,D A,C,D,B B,D,C,A B,C,D,A D,C,B,A23请参见图示。