2021年CCNA(200-301)带中文翻译考试题库

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CCNA中英对照题库(选择题)

CCNA中英对照题库(选择题)

CCNA(200-120)题库中英对照整理于:2015年3月31日版本:1.2声明:本题库来源互联网(鸿鹄论坛)本题库为英文考试原版左右选择题中文考试为随机抽取英文题的中译版此题库非中文考试题库,而是英文题库手动翻译此题库为手工个人翻译,存在错误和不妥难免,不代表任何官方机构和组织本题库旨在更好的理解英文原本题库,也可以用于中文考试参考用。

如发现任何错误或不当之处,可以自行修改,但请更新版本以免混乱,也可致上传者。

QUESTION001Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.) 参照下图,这个图示显示了R1接受到如图所示数据帧的时候会怎么做?Router1 will strip off the source MAC address and replace it with the MACaddress 0000.0c36.6965.R1会剥离源MAC地址,以0000:0C36.6965代替。

Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1. R1会剥离源IP地址,以192.168.40.1代替。

Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.R1会剥离源MAC地址,以0000:0C36.6965代替。

Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.R1会剥离目的IP地址,以192.168.40.1代替。

CCNA 200-120 题库单词讲解

CCNA 200-120 题库单词讲解

第1 题prompt [prɔmpt]n. 提示;付款期限;dos 命令:改变dos 系统提示符的风格adj. 敏捷的,迅速的;立刻的vt. 提示;促进;激起;(给演员)提白adv. 准时地indicate ['indikeit]vt. 表明;指出;预示;象征privilege ['privilidʒ]n. 特权;优待;基本权利vt. 给与…特权;特免第2 题environment [in'vaiərənmənt]n. 环境,外界inventory ['invəntəri, -tɔ:ri]n. 存货,存货清单;详细目录;财产清册platform ['plætfɔ:m]n. 平台;月台,站台;坛;讲台第3 题connection [kə'nekʃən]n. 连接;关系;连接件native ['neitiv]n. 本地人;土产;当地居民adj. 本国的;土著的;天然的;与生俱来的;天赋的specify ['spesəfai, -si-]vt. 指定;详细说明;列举;把…列入说明书scenario [si'nɑ:riəu, -'næ-, -'nεə-]n. 方案;情节;剧本giant ['dʒaiənt]n. 巨人;伟人;[动] 巨大的动物adj. 巨大的;巨人般的saturate ['sætʃəreit, 'sætʃərit]adj. 浸透的,饱和的;深颜色的vt. 浸透,使湿透;使饱和,使充满untaggedadj. 未加标签的appear [ə'piə]vi. 出现;显得;似乎;出庭第4 题correctly [kə'rektli]adv. 正确地;得体地configure [kən'fiɡə]vt. 安装;使成形;配置serial ['siəriəl, 'si:r-]n. 电视连续剧;[图情] 期刊;连载小说adj. 连续的;连载的;分期偿还的usable ['ju:zəbl]adj. 可用的;合用的(等于useable)第5 题apply [ə'plai]vi. 申请;涂,敷;适用;请求vt. 申请;涂,敷;应用option ['ɒpʃ(ə)n]n. [计] 选项;选择权;买卖的特权第6 题第7 题stack [stæk]n. 堆;堆叠vt. 使堆叠;把…堆积起来vi. 堆积,堆叠loopback [lup'bæk]n. [计] 回送;回路performance [pə'fɔ:məns]n. 性能;绩效;表演;执行attempt [ə'tempt]n. 企图,试图;攻击vt. 企图,试图;尝试crossover ['krɔ:s,əuvə]n. 交叉;天桥;转线路;[篮]变向运球过人第8 题第9 题第10 题merge [mə:dʒ]vt. 合并;使合并;吞没vi. 合并;融合第11 题store [stɔ:]n. 商店;储备,贮藏;仓库vt. 贮藏,储存第12 题type [taip]n. 类型,品种;模范;样式vt. 打字;测定(血等)类型vi. 打字第13 题第14 题enabledv. 使能够;授权给…(enable 的过去分词)adj. 激活的;可行的第15 题第16 题第17 题第18 题utilization [,ju:tilai'zeiʃən, -li'z-]n. 利用,使用第19 题encapsulation [in,-kæpsə'leiʃən]n. 封装;包装第20 题calculate ['kælkjuleit]vt. 计算;预测;认为;打算vi. 计算;以为;作打算reliability [ri,laiə'biləti]n. 可靠性第21 题implement ['implimənt, 'impliment]n. 工具,器具;手段vt. 实施,执行;实现,使生效onferencing ['kɔnfərənsiŋ]n. 会议技术v. 开会(conference 的现在分词)stutter ['stʌtə]n. 口吃,结巴vi. 结结巴巴地说话vt. 结结巴巴地说出modulation [,mɔdju'leiʃən, -dʒu-]n. [电子] 调制;调整reliable [ri'laiəbl]n. 可靠的人adj. 可靠的;可信赖的第22 题responsible [ri'spɔnsəbl]adj. 负责的,可靠的;有责任的determine [di'tə:min]vt. 决定;判决;使…下定决心vi. 确定;决定;判决,终止availability [ə,veilə'biləti]n. 可用性;有效性;实用性第23 题transfer [træns'fə:]n. 转让;转移;传递;过户vt. 使转移;调任vi. 转让;转学;换车request [ri'kwest]n. 请求;需要vt. 要求,请求transport [træns'p ɔ:t; trænz-træns'p ɔ:t, trænz-, trɑ:n-, 'trænspɔ:t, 'træn. 运输;运输机;狂喜;流放犯vt. 运输;流放;使狂喜maintain [mein'tein]vt. 维持;继续;维修;主张;供养issue ['iʃju:, 'isju:]n. 问题;流出;期号;发行物vt. 发行,发布;发给;放出,排出vi. 发行;流出;造成…结果;传下troubleshooting ['trʌbl,ʃu:tiŋ]n. 解决纷争;发现并修理故障v. 检修(troubleshoot 的ing 形式);当调解人第24 题esponsible [ri'spɔnsəbl]adj. 负责的,可靠的;有责任的第25 题reveal [ri'vi:l]n. 揭露;暴露;门侧,窗侧vt. 显示;透露;揭露;泄露powercycle ['saɪk(ə)l]重新启动第26 题第27 题第28 题convert [kən'və:t]n. 皈依者;改变宗教信仰者vt. 使转变;转换…;使…改变信仰vi. 转变,变换;皈依;改变信仰analog ['ænəlɔɡ]n. [自] 模拟;类似物adj. [自] 模拟的;有长短针的signal ['sɪgn(ə)l]n. 信号;暗号;导火线adj. 显著的;作为信号的vt. 标志;用信号通知vi. 发信号leased [li:st]adj. [租赁] 租用的n. 专线;一线路(指一电话线路每天24 小时地连通两地)v. 租用(lease 的过去式和过去分词)digital ['didʒitəl]n. 数字;键adj. 数字的;手指的第29 题currently ['kʌrəntli]adv. 当前;一般地efficiently [i'fiʃəntli]adv. 有效地;效率高地(efficient 的副词形式)security [si'kjuəriti]n. 安全;保证;证券;抵押品adj. 安全的;保安的;保密的perform [pə'fɔ:m]vt. 执行;完成;演奏vi. 执行,机器运转;表演第30 题HDLC (High-level Data Link Control)高级数据链路控制encapsulation [in,-kæpsə'leiʃən]n. 封装;包装verify ['verifai]vt. 核实;查证第31 题CIR (Committed Information Rate)承诺信息速率committed [kə'mɪtɪd]adj. 坚定的;效忠的;承担义务的v. 承诺;委托;干坏事;付诸(commit 的过去分词)Exceed [ɪk'sid]vt. 超过;胜过vi. 超过其他eligible ['elidʒəbl]n. 合格者;适任者;有资格者adj. 合格的,合适的;符合条件的;有资格当选的第32 题characteristics [,kærəktə'ristiks]n. 特性,特征;特色(characteristic 的复数);特质domain [dəu'mein]n. 领域;域名;产业;地产subinterface子接口emulate ['emjuleit, 'emjulit]n. 仿真;仿效vt. 仿真;模仿;尽力赶上;同…竞争full mesh全网状;全连接第33 题range [reindʒ]n. 范围;幅度;排;山脉vt. 漫游;放牧;使并列;归类于;来回走动vi. 平行,列为一行;延伸;漫游;射程达到第34 题section ['sɛkʃən]n. 截面;部门;地区;章节vi. 被切割成片;被分成部分vt. 把…分段;将…切片;对…进行划分第35 题feature ['fi:tʃə]n. 特色,特征;容貌;特写或专题节目vt. 特写;以…为特色;由…主演vi. 起重要作用inherent [ɪn'hɪrənt]adj. 固有的;内在的;与生俱来的,遗传的weakness ['wiknəs]n. 弱点;软弱;嗜好encryption [in'kripʃən]n. 加密;加密术algorithm ['ælɡəriðəm]n. [计][数] 算法,运算法则temporal ['tempərəl]n. 世间万物;暂存的事物adj. 暂时的;当时的;现世的authentication [ɔ:,θenti'keiʃən]n. 证明;鉴定;证实initialization [i,niʃəlai'zeiʃən, -li'z-]n. [计] 初始化;赋初值vector ['vektə]n. 矢量;带菌者;航线vt. 用无线电导航sequence ['si:kwəns]n. [数][计] 序列;顺序;续发事件vt. 按顺序排好第36 题WEP (Wired Equivalent Privacy)有线等效加密equivalent [ɪ'kwɪv(ə)l(ə)nt]n. 等价物,相等物adj. 等价的,相等的;同意义的privacy ['prɪvəsɪ; 'praɪ-]n. 隐私;秘密;隐居;隐居处TKIP (Temporal Key Integrity Protocol)临时密钥完整性协议第37 题第38 题第39 题periodic [,piəri'ɔdik]adj. 周期的;定期的regardless 美[rɪ'ɡɑrdləs]adj. 不管;不顾;不注意第40 题destined for ['destɪnd]驶往;去往第41 题conflict [kən'flikt, 'kɔnflikt]n. 冲突,矛盾;斗争;争执vi. 冲突,抵触;争执;战斗remain [ri'mein]n. 遗迹;剩余物,残骸vi. 保持;依然;留下;剩余;逗留;残存第42 题第43 题第44 题script [skript]n. 脚本;手迹;书写用的字母vt. 把…改编为剧本vi. 写电影脚本additive ['æditiv]n. 添加剂,添加物adj. 附加的;[数] 加法的effectively [i'fektivli]adv. 有效地,生效地;有力地;实际initial [ɪ'nɪʃəl]adj. 最初的;字首的vt. 用姓名的首字母签名n. 词首大写字母第51 题第52 题上boot [bu:t]n. 靴子;踢;汽车行李箱vt. 引导;踢;解雇;使穿靴viable ['vaiəbl]adj. 可行的;能养活的;能生育的第45 题represent [,repri'zent]vt. 代表;表现;描绘;回忆;再赠送vi. 代表;提出异议redistribute [,ridɪ'strɪbjut]vt. 重新分配;再区分第46 题gather ['ɡæðə]n. 聚集;衣褶;收获量vt. 收集;收割;使…聚集;使…皱起vi. 聚集;化脓;皱起reachable ['ri:tʃəbl]adj. 可获得的;可达成的第47 题diagram ['daiəɡræm]n. 图表;图解vt. 用图解法表示第48 题第49 题implementation [,implimen'teiʃən] n. [计] 实现;履行;安装启用第50 题translation [træns'leʃən]n. 翻译;译文;转化;调任prefix [,pri:'fiks, 'pri:fiks]n. 前缀vt. 加前缀;将某事物加在前面第53 题第54 题第55 题Report [rɪ'pɔrt]n. 报告;报道;成绩单vt. 报告;报导;使报到vi. 报告;报到;写报导第56 题represent [,repri'zent]vt. 代表;表现;描绘;回忆;再赠送vi. 代表;提出异议第57 题sequence ['si:kwəns]n. [数][计] 序列;顺序;续发事件vt. 按顺序排好第58 题destine for驶往;预定;注定;驶往traffic ['træfik]n. 交通;运输;贸易;[通信] 通信量流量console [kən'səul]n. [计] 控制台;[电] 操纵台vt. 安慰;慰藉vt. 用…作交换;在…通行vi. 交易,买卖process ['prəuses, 'prɔ-]n. 过程,进行;方法,步骤;作用;程序;推移adj. 经过特殊加工(或处理)的vt. 处理;加工vi. 列队前进implicit [im'plisit]adj. 含蓄的;暗示的;盲从的第59 题n. 进入;入口;条目;登记;报关手续;对土地的侵占cache [kæʃ]n. 电脑高速缓冲存储器;贮存物;隐藏处vt. 隐藏;窖藏vi. 躲藏effect [i'fekt]n. 影响;效果;作用vt. 产生;达到目的第60 题conserve [kən'sə:v, 'kɔnsə:v]n. 果酱;蜜饯vt. 保存;保护,将…做成蜜饯;使守恒latency ['leitənsi]n. 延迟,潜伏;潜在因素alternative [ɔ:l'tə:nətiv]n. 二中择一;供替代的选择adj. 供选择的;选择性的;交替的第61 题location [ləu'keiʃən]n. 位置(形容词locational);地点;外景拍摄场地第62 题第63 题第64 题logical ['lɔdʒikəl]adj. 合逻辑的,合理的;逻辑学的function ['fʌŋkʃən]n. 功能;[数] 函数;职责;盛大的集会vi. 运行;活动;行使职责第65 题第66 题entry ['entri]ARPaddress resolution protocol地址解释协议第67 题crossover ['krɔ:s,əuvə]n. 交叉;天桥;转线路;[篮]变向运球过人第68 题regarding [ri'ɡɑ:diŋ, ri:-]prep. 关于,至于examine [iɡ'zæmin]vt. 检查;调查;检测;考试vi. 检查;调查forward ['fɔ:wəd]n. 前锋adj. 向前的;早的;迅速的adv. 向前地;向将来vt. 促进;转寄;运送第69 题segment ['seɡmənt, seɡ'ment, 'seɡment]n. 段;部分vt. 分割vi. 分割occur [ə'kə:]vi. 发生;出现;存在eliminate [i'limineit]vt. 消除;排除generally ['dʒenərəli]adv. 通常;普遍地,一般地latency ['leitənsi]n. 延迟,潜伏;潜在因素第70 题primarily ['praimərəli, prai'me-]adv. 首先;主要地,根本上frequently ['fri:kwəntli]adv. 频繁地,经常地;时常,屡次decision [di'siʒən]n. 决定,决心;决议第71 题representative [,repri'zentətiv]n. 代表;典型;众议员adj. 典型的,有代表性的;代议制的provider [prəu'vaidə]n. 供应者;养家者command [kə'mænd]vi. 命令,指挥;控制vt. 命令,指挥;控制;远望n. 指挥,控制;命令;司令部第72 题第73 题第74 题retail ['ri:teil]n. 零售adj. 零售的vt. 零售;转述adv. 以零售方式vi. 零售minimum ['miniməm]n. 最小值;最低限度;最小化;最小量adj. 最小的;最低的maximum ['mæksiməm]n. [数] 极大,最大限度;最大量adj. 最高的;最多的;最大极限的appropiateadj. 适当的;恰当的第75 题第76 题第77 题desirable [di'zaiərəbl]n. 合意的人或事物adj. 令人满意的;值得要的第78 题concept ['kɔnsept]n. 观念,概念backbone ['bækbəun]n. 支柱;主干网;决心,毅力;脊椎hierarchical [,haiə'rɑ:kikəl, hai'rɑ:-]adj. 分层的;等级体系的multiple ['mʌltipl]n. 倍数;[电] 并联adj. 多重的;多样的;许多的第79 题第80 题autonomous [ɔ'tɑnəməs]adj. 自治的;自主的;自发的instability [,instə'biləti]n. 不稳定(性);基础薄弱;不安定routing overhead路由开销extensive [ik'stensiv]adj. 广泛的;大量的;广阔的第81 题第82 题第83 题CIDRabbr. 无类域内路由选择(classlessinter-domain routing)第84 题flow [fləu]n. 流动;流量;涨潮,泛滥vt. 淹没,溢过vi. 流动,涌流;川流不息;飘扬flow control[计] 流控制buffer ['bʌfə]n. [计] 缓冲区;缓存;缓冲器,[车辆]减震器第 95 题vt. 缓冲congestion [k ən'd ʒest ʃən] n. 拥挤;拥塞;充血avoidance [ə'v ɔid əns]n. 逃避;废止;职位空缺congestion avoidance n. 拥塞避免 第 85 题 第 86 题 第 87 题 第 88 题 第 89 题supply [s ə'plai]n. 供给,补给;供应品 vt. 供给,提供;补充 vi. 供给;替代第 90 题obtain [əb'tein, ɔb-] vt. 获得 vi. 获得;流行present ['prez ənt, pri'zent] n. 现在;礼物;瞄准 adj. 现在的;出席的vt. 提出;介绍;呈现;赠送 vi. 举枪瞄准第 91 题 第 92 题 ction ['æk ʃən] n. 行动;活动;功能;战斗;情节 第 93 题partial ['p ɑ:ʃəl]adj. 局部的;偏爱的;不公平的 第 94 题第 96 题composite ['k ɔmp əzit]n. 复合材料;合成物;菊科 adj. 复合的;合成的;菊科的 vt. 使合成;使混合possible ['p ɔs əbl]n. 可能性;合适的人;可能的事物 adj. 可能的;合理的;合适的 install [in'st ɔ:l]vt. 安装;任命;安顿第 97 题purpose ['p ə:p əs] n. 目的;用途;意志 vt. 决心;企图;打算 uniquely [ju:'ni:kli] adv. 独特地;珍奇地 identify [ai'dentifai] vi. 确定;认同;一致vt. 确定;识别;使参与;把…看成一 样differentiate [,d ɪf ə'r ɛn ʃɪet] vi. 区分,区别第 98 题 第 99 题 passive ['pæs ɪv] n. 被动语态adj. 被动的,消极的;被动语态的 authentication [ɔ:,θenti'kei ʃən] n. 证明;鉴定;证实 query ['kw ɪər ɪ]]n. 疑问,质问;疑问号 ;[计]查询 vi. 询问;表示怀疑vt. 询问;对……表示疑问 replacement [r ɪ'ple ɪsm(ə)nt]n. 更换;复位;代替者;补充兵员 feasible ['fi:z əbl]adj. 可行的;可能的;可实行的 identify [ai'dentifai] vi. 确定;认同;一致vt. 确定;识别;使参与;把…看成一样第100 题representation [,reprizen'teiʃən]n. 代表;表现;表示法;陈述dashed [dæʃt]n. 虚线v. 猛冲(dash 的过去分词);猛掷第101 题populate ['pɔpjuleit]vt. 居住于;构成人口;移民于;殖民于initiate [i'niʃieit, i'niʃiət, -eit]n. 开始;新加入者,接受初步知识者vt. 开始,创始;发起;使初步了解adj. 新加入的;接受初步知识的第104 题illegal [ɪ'ligl]adj. [法] 非法的;违法的;违反规则的n. 非法移民;间谍第105 题conserve [kən'sə:v, 'kɔnsə:v]n. 果酱;蜜饯vt. 保存;保护,将…做成蜜饯;使守第102 题appropriate [ə'prəuprieit, ə'prəupriət] adj. 适当的vt. 占用;拨出stub [stʌb]n. 存根;烟蒂;树桩;断株末结vt. 踩熄;连根拔除override [,əuvə'raid]n. 代理佣金vt. 推翻(覆盖);不顾;践踏dynamic [daɪ'næmɪk]n. 动态;动力adj. 动态的;动力的;动力学的;有活力的specify ['spesɪfaɪ]vt. 指定;详细说明;列举;把…列入说明书第103 题prepare [prɪ'peə]vt. 准备;使适合;装备;起草vi. 预备;做好思想准备overlap [,əuvə'læp, 'əuvəlæp]n. 重叠;重复vt. 与…重叠;与…同时发生vi. 部分重叠;部分的同时发生reside [ri'zaid]vt. 住,居住;属于恒第106 题第107 题assume [ə'sju:m, ə'su:m]vi. 装腔作势;多管闲事vt. 承担;假定;采取;呈现第108 题variance ['veərɪəns]n. 变异;变化;不一致;分歧;[数]方差第109 题execute ['eksikju:t]vt. 实行;执行;处死第110 题第111 题series ['siəri:z, -riz]n. 系列,连续;[电] 串联;级数;丛书第112 题simultaneously [saiməl'teiniəsli] adv. 同时地dual stack双协议栈第 113题 第 122题 第 121 题mechanism ['mek əniz əm]n. 机制;原理,途径;进程;机械装 置;技巧ISATAP (站内自动隧道寻址机制) Intra-Site Automatic TunnelAddressing Protocol teredo [t ə'ri:d əu, -'rei-]n. [无脊椎][木] 蛀船虫第 114 题 第 115 题 response [ri'sp ɔns]n. 响应;反应;回答第 116 题第 123 题complaint [k əm'plent]n. 抱怨;诉苦;疾病;委屈 proper ['pr ɔp ə]adj. 适当的;本身的;特有的;正派的 adv. 完全地第 124 题 第 125 题 issue ['i ʃju:, 'isju:]n. 问题;流出;期号;发行物 vt. 发行,发布;发给(出);放出,排 出第 117 题validate ['vælideit]vt. 证实,验证;确认;使生效 第 118 题 第 119 题 identifier [ai'dentifai ə]n. 标识符,认同者;检验人,鉴定人 第 120 题inadequate [in'ædikwit] adj. 不充分的,不适当的 external [ik'st ə:n əl] n. 外部;外观;外面adj. 外部的;表面的;[药] 外用的; 外国的;外面的referred to被提及;被交付reference ['ref ər əns]n. 参考,参照;涉及,提及;参考书目;介绍信;证明书 vt. 引用 vi. 引用vi. 发行;流出;造成…结果;传下 reply [r ɪ'plai] vi. 回答;[法] 答辩;回击 n. 回答;[法] 答辩 vt. 回答;答复 第 126 题faulty ['f ɔːlt ɪ; 'f ɒlt ɪ] 详细» adj. 有错误的;有缺点的 signal ['s ɪgn(ə)l] »n. 信号;暗号;导火线 adj. 显著的;作为信号的 vt. 标志;用信号通知vi. 发信号 第 127 题corporate ['k ɔ:p ərit]adj. 法人的;共同的,全体的;社团的 第 128 题downtime ['da ʊnta ɪm]n. (工厂等由于检修,待料等的)停 工期;[电子] 故障停机时间 due toadv. 由于;应归于 link [l ɪŋk]n. [计] 链环,环节;联系,关系vt. 连接,连结;联合,结合vi. 连接起来;联系在一起;将人或物连接或联系起来redundancy [ri'dʌndənsi]n. [计][数] 冗余(等于redundance);裁员;人浮于事redundant [ri'dʌndənt]adj. 多余的,过剩的;被解雇的,失业的;冗长的,累赘的第129 题flood [flʌd]n. 洪水;泛滥;一大批vt. 淹没;充满;溢出vi. 涌出;涌进;为水淹没denial [di'naiəl]n. 否认;拒绝;节制;背弃brute [bru:t]n. 畜生;残暴的人adj. 残忍的;无理性的force [fɔ:s]n. 力量;武力;军队;魄力vt. 促使,推动;强迫;强加reconnaissance [ri'kɔnisəns]n. [ 军] 侦察;勘测(等于reconnoissance);搜索;事先考查Trojan ['trəudʒən]n. 勇士;特洛伊人;勤勉的人adj. 特洛伊的;特洛伊人的第130 题load [ləud]n. 负载,负荷;工作量;装载量vt. 使担负;装填vi. [力] 加载;装载;装货specific [spi'sifik]n. 特性;细节;特效药adj. 特殊的,特定的;明确的;详细的;[药] 具有特效的boot [bu:t]n. 靴子;踢;汽车行李箱vt. 引导;踢;解雇;使穿靴instruct [in'strʌkt]vt. 指导;通知;命令;教授locate [ləu'keit, 'ləu]vt. 位于;查找…的地点vi. 定位;定居第131 题第132 题第133 题normally ['nɔ:məli]adv. 正常地;通常地,一般地seek [si:k]vt. 寻求;寻找;探索;搜索vi. 寻找;探索;搜索trigger ['triɡə]n. 扳机;[电子] 触发器;制滑机vt. 引发,引起;触发vi. 松开扳柄第134 题beyond [bi'jɔnd]prep. 超过;越过;那一边;在...较远的一边n. 远处adv. 在远处;在更远处第135 题第136 题enabledv. 使能够;授权给…(enable 的过去分词)adj. 激活的;可行的threshold ['θreʃhəuld]n. 入口;门槛;开始;极限;临界值absolute ['æbsəlju:t, ,æbsə'lju:t]n. 绝对;绝对事物adj. 绝对的;完全的;专制的aging ['eidʒiŋ]n. 老化;陈化,熟化expired [iks'paiəd]v. 期满(expire 的过去分词)adj. 过期的;失效的第137 题第138 题第149 题conflict [kən'flikt, 'kɔnflikt]n. 冲突,矛盾;斗争;争执vi. 冲突,抵触;争执;战斗gratuitous [ɡrə'tju:itəs]adj. 无理由的,无端的;免费的reuse [riː'juːz]n. 重新使用,再用vt. 再使用第139 题第140 题Carrier Sensing载波侦听第141 题第142 题第143 题第144 题第145 题review [ri'vju:]n. 回顾;复习;评论;检讨;检阅vt. 回顾;检查;复审vi. 回顾;复习功课;写评论第146 题evaluate [i'væljueit]vt. 评价;估价;求…的值vi. 评价;估价efficiency [i'fiʃənsi]n. 效率;效能;功效participate [pɑ:'tisipeit]vi. 参与,参加;分享vt. 分享;分担第147 题第148 题overlap [,əuvə'læp, 'əuvəlæp]n. 重叠;重复vt. 与…重叠;与…同时发生vi. 部分重叠;部分的同时发生discontiguous [,diskən'tiɡjuəs]adj. 不连接的;不接触的第150 题verify ['verifai]vt. 核实;查证operation [,ɔpə'reiʃən]n. 操作;经营;[外科] 手术;[数][计]运算第151 题assignment [ə'sainmənt]n. 分配;任务;作业;功课identical [ai'dentikəl]n. 完全相同的事物adj. 同一的;完全相同的第152 题parament ['pærəmənt]n. 【基督教】幔帐等宗教性悬挂物(如装饰帘帷,礼罩,祭台布等)参数变量第153 题approach [ə'prəutʃ]n. 方法;途径;接近vt. 接近;着手处理vi. 靠近effective [i'fektiv]adj. 有效的,起作用的;实际的,实在的;给人深刻印象solution [sə'lju:ʃən]n. 解决方案;溶液;溶解;解答第154 题第155 题第156 题prefix [,pri:'fiks, 'pri:fiks]n. 前缀vt. 加前缀;将某事物加在前面第157 题elapse [i'læps]n. 流逝;时间的过去vi. 消逝;时间过去due 报错[du]adj. 到期的;预期的;应付的;应得的n. 应付款;应得之物adv. 正(置于方位词前)第158 题properly ['prɔpəli]adv. 适当地;正确地;恰当地第163 题conclusion [kən'klu:ʒən]n. 结论;结局;推论第164 题第165 题第166 题第167 题designated ['deziɡ,neitid]adj. 指定的;特指的第168 题least [li ːst]详细»第169 题n. 最小;最少adj. 最小的;最少的(little 的最高级)adv. 最小;最少impact ['impækt, im'pækt]n. 影响;效果;碰撞;冲击力vt. 影响;撞击;冲突;压紧vi. 冲击;产生影响第159 题第160 题prefer [pri'fə:]vt. 更喜欢;宁愿;提出;提升vi. 喜欢;愿意第161 题retransmit [,ri:trænz'mit, -træns-]vt. 转播;中继;重新发送interval ['intəvəl]n. 间隔;间距;幕间休息queue [kju:]n. 队列;长队;辫子vt. 将…梳成辫子;使…排队vi. 排队;排队等候adjacent [ə'dʒeɪs(ə)nt]adj. 邻近的,毗连的第162 题第170 题originally [ə'rɪdʒənəli]adv. 最初,起初;本来eliminate [i'limineit]vt. 消除;排除discontiguous [,diskən'tiɡjuəs]adj. 不连接的;不接触的第171 题第172 题suspected [sə'spektid]v. 怀疑(suspect 的过去分词和过去式)adj. 有嫌疑的overloaded ['əuvə'ləudid]adj. 超载的;超负荷的;超重的v. 使超载;使负担过重(overload 的过去分词)partial ['pɑ:ʃəl]adj. 局部的;偏爱的;不公平的corporate ['kɔ:pərit]adj. 法人的;共同的,全体的;社团的experience [ik'spiəriəns]n. 经验;经历;体验vt. 经验;经历;体验corporate ['kɔ:pərit]adj. 法人的;共同的,全体的;社团的congestion [kən'dʒestʃən]n. 拥挤;拥塞;充血第173 题congestion [kən'dʒestʃən]n. 拥挤;拥塞;充血第174 题signify ['signifai]vt. 表示;意味;预示vi. 有重要性;要紧;冒充内行corrupt [kə'rʌpt]adj. 腐败的,贪污的;堕落的vt. 使腐烂;使堕落,使恶化vi. 堕落,腐化;腐烂omit [ə'mɪt]vt. 省略;遗漏;删除;疏忽第175 题duplex ['duplɛks]adj. 二倍的,双重的n. 双工;占两层楼的公寓套房第176 题remote [rɪ'məʊt]adj. 遥远的;偏僻的;疏远的n. 远程第177 题第178 题synchronize ['siŋkrənaiz]vt. 使……合拍;使……同步vi. 同步;同时发生the rest of其余的;剩下的第179 题第180 题negotiate [ni'ɡəuʃieit, -si-]vi. 谈判,交涉vt. 谈判,商议;转让;越过第181 题priority [prai'ɔrəti]n. 优先;优先权;[数] 优先次序;优先考虑的事upgrade [ʌp'greɪd]n. 升级;上升;上坡vt. 使升级;提升;改良品种adj. 向上的adv. 往上第182 题term [tə:m]n. 术语;学期;期限;条款vt. 把…叫做allocate ['æləukeit]vt. 分配;拨出;使坐落于vi. 分配;指定acquire [ə'kwaiə]vt. 获得;取得;学到;捕获adapt [ə'dæpt]vi. 适应vt. 使适应;改编adapt to使自己适应于…第183 题secure [si'kjuə]vt. 保护;弄到;招致;缚住adj. 安全的;无虑的;有把握的;稳当的vi. 获得安全;船抛锚;停止工作第184 题第185 题execute ['eksikju:t]vt. 实行;执行;处死increment ['ɪŋkrəmənt]n. [数] 增量;增加;增额;盈余第186 题manually ['mænjuəli]adv. 手动地;用手第187 题第188 题gather ['ɡæðə] n. 聚集;衣褶;收获量vt. 收集;收割;使…聚集;使…皱起vi. 聚集;化脓;皱起available [ə'veiləbl]adj. 有效的,可得的;可利用的;空闲vi. 互相联系vt. 使互相连接determine [di'tə:min]vt. 决定;判决;使…下定决心vi. 确定;决定;判决,终止connectivity [,kɔnek'tivəti]n. [数] 连通性第194 题第195 题的bootstrap ['bu:tstræp]n. [计] 引导程序,辅助程序;解靴带第189 题第190 题stability [stə'bɪləti]n. 稳定性;坚定,恒心specifies [spesifais]n. 指定decrease [di'kri:s, 'di:-, 'di:kri:s, di'k-]n. 减少,减小;减少量vt. 减少,减小vi. 减少,减小indicate ['indikeit]vt. 表明;指出;预示;象征第191 题regardless [rɪ'ɡɑrdləs]adj. 不管;不顾;不注意membership ['membəʃip]n. 资格;成员资格;会员身分第192 题location [ləu'keiʃən]n. 位置(形容词locational);地点;外景拍摄场地第193 题verify ['verifai]vt. 核实;查证interconnect [,intəkə'nekt] 第196 题implement ['implimənt, 'impliment] n. 工具,器具;手段vt. 实施,执行;实现,使生效第197 题maintain [mein'tein]vt. 维持;继续;维修;主张;供养consistency [kən'sɪstənsi]n. [计] 一致性;稠度;相容性across [ə'krɔs]prep. 穿过,通过;横穿adv. 横过;在对面propagate ['prɔpəɡeit]vt. 传播;传送;繁殖;宣传vi. 繁殖;增殖throughout [θrʊ'aʊt]adv. 自始至终,到处;全部prep. 贯穿,遍及第198 题第199 题simultaneously [saiməl'teiniəsli] adv. 同时地第200 题enterprise ['entəpraiz]n. 企业;事业;进取心;事业心第201 题第202 题accurately ['ækjuritli]adv. 精确地,准确地mention ['menʃ(ə)n]n. 提及,说起vt. 提到,谈到;提及,论及;说起第203 题第204 题initial 报错[ɪ'nɪʃəl]adj. 最初的;字首的vt. 用姓名的首字母签名n. 词首大写字母第205 题第206 题typical ['tɪp ɪkl]adj. 典型的;特有的;象征性的arrangement [ə'rendʒmənt]n. 布置;整理;准备separate ['sepəreit, 'sepərit]n. 分开;抽印本adj. 单独的;分开的vt. 使分离;使分开;使分居vi. 分开;隔开;分居span [spæn]n. 跨度,跨距;范围vt. 跨越;持续;以手指测量bridging table桥接表第207 题第208 题第209 题第210 题introduce [ɪntrə'djuːs]vt. 介绍;引进;提出;采用第211 题disable [dis'eib]vt. 使失去能力;使残废;使无资格mix [mɪks]vt. 配制;混淆;使混和;使结交vi. 参与;相混合;交往n. 混合;混合物;混乱第212 题appropriate [ə'prəuprieit, ə'prəupriət]adj. 适当的vt. 占用;拨出第213 题第214 题第215 题第216 题perform [pə'fɔ:m]vt. 执行;完成;演奏vi. 执行,机器运转;表演parameter [pə'ræmitə]n. 参数;系数;参量monitor ['mɔnitə]n. 监视器;监听器;监控器;班长vt. 监控assign [ə'sain]vt. 分配;指派;[计][数] 赋值vi. 将财产过户(尤指过户给债权人)第217 题hierarchical [,haiə'rɑ:kikəl, hai'rɑ:-]adj. 分层的;等级体系的negotiation [ni,ɡəuʃi'eiʃən, -si-]n. 谈判;协商;转让;顺利的通过entry ['entri]n. 条目;进入;入口;条目;登记;报关手续;对土地的侵占efficient [i'fiʃənt]adj. 有效率的;有能力的;生效的utilization [,ju:tilai'zeiʃən, -li'z-]n. 利用,使用dedicated ['dɛdə'ketɪd]adj. 专用的;专注的;献身的v. 以…奉献;把…用于(dedicate 的过去式和过去分词)第218 题segmentation [,seɡmən'teiʃən, -mən-]n. 分割;割断;细胞分裂,分段市场细分,分段,细分第219 题第220 题第221 题第222 题第223 题第224 题第225 题第226 题capable ['kepəbl]adj. 能干的,能胜任的;有才华的synchronize ['siŋkrənaiz]vt. 使……合拍;使……同步vi. 同步;同时发生第227 题第228 题efficient [i'fiʃənt]adj. 有效率的;有能力的;生效的第229 题vi. 分配;指定agreement [ə'ɡri:mənt]n. 协议;同意,一致permanently ['pə:mənəntli]adv. 永久地,长期不变地fixed [fikst]adj. 固执的;处境...的;准备好的;确定的periodically [,piəri'ɔdikəli]adv. 定期地;周期性地;偶尔;间歇lease [li:s]n. 租约;租期;租赁物;租赁权vt. 出租;租得vi. 出租第233 题第234 题originate [ə'ridʒəneit]vi. 发源;发生;起航vt. 引起;创作第235 题requirement [ri'kwaiəmənt]n. 要求;必要条件;必需品第236 题第237 题significant [sig'nifikənt]n. 象征;有意义的事物adj. 重大的;有效的;有意义的;值得注意的;意味深长的identify [ai'dentifai]vi. 确定;认同;一致vt. 确定;识别;使参与;把…看成一第230 题第231 题第232 题allocate ['æləukeit]vt. 分配;拨出;使坐落于样unique [jʊ'nik]adj. 独特的,稀罕的;[数] 唯一的,独一无二的n. 独一无二的人或物instance ['instəns]n. 实例;情况;建议vt. 举...为例optional ['ɔpʃənəl]n. 选修科目adj. 可选择的,随意的第238 题perform [pə'fɔ:m]vt. 执行;完成;演奏vi. 执行,机器运转;表演assignment [ə'sainmənt]n. 分配;任务;作业;功课microsegmentation[maikrəuseɡmən'teɪʃən]微分段第239 题enterprise ['entəpraiz]n. 企业;事业;进取心;事业心第240 题plugged into把插头插入be about to即将;刚要;正打算bring [briŋ]vt. 带来;促使;引起;使某人处于某种情况或境地employ [ɪm'plɔɪ]vt. 使用,采用;雇用;使忙于,使从事于n. 使用;雇用proprietary [prəu'praiətəri]n. 所有权;所有人adj. 所有的;专利的;私人拥有的connector [kə'nektə]n. 连接器,连接头incompatible [,inkəm'pætəbl]n. 互不相容的人或事物adj. 不相容的;矛盾的;不能同时成立spoof [spu:f]n. 诳骗;愚弄;戏弄;讽刺性文章vi. 行骗;开玩笑vt. 哄骗;戏弄;对…作幽默讽刺adj. 哄骗的第241 题concern [kən'sə:n]n. 关系;关心;关心的事vt. 涉及,关系到;使担心lack [læk]n. 缺乏;不足vt. 缺乏;不足;没有;需要vi. 缺乏;不足;没有impeding [im'pe:diŋ]adj. 临近的;(尤指坏事)即将发生的妨碍performance [pə'fɔ:məns]n. 性能;绩效;表演;执行第242 题第243 题第244 题adjacency [ə'dʒeisənsi]n. 毗邻;四周;邻接物interval ['intəvəl]n. 间隔;间距;幕间休息第245 题第246 题第247 题第248 题第249 题的associate [ə'səuʃieit, ə'səuʃiət,-eit]n. 同事,伙伴;关联的事物adj. 副的;联合的vt. 联想;使联合;使发生联系vi. 交往;结交第250 题第251 题第252 题第253 题第254 题第255 题第256 题violate ['vaiəleit]vt. 违反;侵犯,妨碍;亵渎第257 题第258 题第259 题第260 题divide [di'vaid]n. [地理] 分水岭,分水线vt. 划分;除;分开;使产生分歧vi. 分开;意见分歧divide into把……分成第261 题overlap [,əuvə'læp, 'əuvəlæp]n. 重叠;重复vt. 与…重叠;与…同时发生vi. 部分重叠;部分的同时发生第262 题isolate ['aisəleit, -lit]n. [生物] 隔离种群vt. 使隔离;使孤立;使绝缘adj. 隔离的;孤立的vi. 隔离;孤立第263 题第264 题redundant [ri'dʌndənt]adj. 多余的,过剩的;被解雇的,失业的;冗长的,累赘的unauthorized [,ʌn'ɔ:θəraizd]adj. 非法的;未被授权的;独断的第265 题process ['prəuses, 'prɔ-]n. 过程,进行;方法,步骤;作用;程序;推移adj. 经过特殊加工(或处理)的vt. 处理;加工vi. 列队前进originate [ə'ridʒəneit]vi. 发源;发生;起航vt. 引起;创作第266 题第267 题handle ['hændl]n. [建] 把手;柄;手感;口实vt. 处理;操作;运用;买卖;触摸vi. 搬运;易于操纵strip off脱衣;脱去;剥落第268 题第269 题destined for驶往;去往第270 题participate [pɑ:'tisipeit]vi. 参与,参加;分享vt. 分享;分担participate in参加;分享第271 题第272 题manufacturing [,mænju'fæktʃəriŋ]n. 制造业;工业adj. 制造的;制造业的v. 制造;生产(manufacture 的ing 形式)unauthorized [,ʌn'ɔ:θəraizd]adj. 非法的;未被授权的;独断的concern [kən'sə:n]n. 关系;关心;关心的事vt. 涉及,关系到;使担心第273 题第274 题rather than 报错而不是;宁可…也不愿第275 题reseat [,ri:'si:t]vt. 使再坐;换…的底座;使复位第276 题第277 题第278 题alternate ['ɔltɚnət]vi. 交替;轮流vt. 使交替;使轮流adj. 交替的;轮流的n. 替换物backup ['bæk,ʌp]n. 支持;后援;阻塞adj. 支持的;候补的vt. 做备份designated ['deziɡ,neitid]adj. 指定的;特指的disabled [dis'eibld]adj. 残废的,有缺陷的v. 使…失去能力(disable 的过去分词)第279 题第280 题第281 题identify [ai'dentifai]vi. 确定;认同;一致vt. 确定;识别;使参与;把…看成一样execute ['eksikju:t]vt. 实行;执行;处死第282 题digital ['didʒitəl]n. 数字;键adj. 数字的;手指的analog ['ænəlɔɡ]n. [自] 模拟;类似物adj. [自] 模拟的;有长短针的onsider [kən'sidə]vi. 考虑;认为;细想vt. 考虑;认为;考虑到;细想terminate ['tə:mineit]vt. 使终止;使结束;解雇adj. 结束的vi. 结束,终止;结果第283 题license ['laisəns]n. 执照,许可证;特许vt. 许可;特许;发许可证给appliance [ə'plaiəns]n. 器具;器械;装置第284 题IDS (Intrusion Detection System)入侵检测系统IPS (Intrusion Prevention System)入侵防御系统intrusion [in'tru:ʒən]n. 侵入;闯入prevention [pri'venʃən, pri:-]n. 预防;阻止;妨碍第285 题performance [pə'fɔ:məns]n. 性能;绩效;表演;执行peak [pi:k]n. 山峰;最高点;顶点;帽舌adj. 最高的;最大值的vt. 使达到最高点;使竖起vi. 消瘦;到达最高点;变憔悴efficiency [i'fiʃənsi]n. 效率;效能;功效antenna [æn'tenə]n. [电讯] 天线;[动] 触角,[昆] 触须direction [di'rekʃən, dai-]n. 方向;指导;趋势;用法说明第286 题第287 题represent [,repri'zent]vt. 代表;表现;描绘;回忆;再赠送vi. 代表;提出异议第288 题interfere [ɪntə'fɪə]vi. 干涉;妨碍;打扰vt. 冲突;介入operation [,ɔpə'reiʃən]n. 操作;经营;[外科] 手术;[数][计]运算similar ['similə] n. 类似物adj. 相似的frequency ['frikwənsi]n. 频率;频繁copier ['kɒpɪə]n. 复印机(等于copying machine);抄写员;模仿者第289 题allowable [ə'lauəbl]adj. 许可的;正当的;可承认的;可获宽免第290 题第291 题representation [,reprizen'teiʃən]n. 代表;表现;表示法;陈述loopback [lup'bæk]n. [计] 回送;回路represent [,repri'zent] vt. 代表;表现;描绘;回忆;再赠送vi. 代表;提出异议hexadecimal [,heksə'desiməl]n. 十六进制adj. 十六进制的mandatory ['mændətəri:, -,tɔ:ri]n. 受托者(等于mandatary)adj. 强制的;托管的;命令的第292 题第293 题script [skript] n. 脚本;手迹;书写用的字母vt. 把…改编为剧本vi. 写电影脚本execute ['eksikju:t]vt. 实行;执行;处死recovery [rɪ'kʌvəri]n. 恢复,复原;痊愈;重获correct [kə'rekt]adj. 正确的;恰当的;端正的vt. 改正;告诫vi. 调整;纠正错误第294 题proprietary [prəu'praiətəri]n. 所有权;所有人adj. 所有的;专利的;私人拥有的implementation [,implimen'teiʃən] n. [计] 实现;履行;安装启用compatible [kəm'pætəbl]adj. 兼容的;能共处的;可并立的original [ə'ridʒənəl]n. 原件;原作;原物;原型adj. 原始的;最初的;独创的;新颖的第295 题untaggedadj. 未加标签的secure [si'kjuə]vt. 保护;弄到;招致;缚住adj. 安全的;无虑的;有把握的;稳当的。

完整版CCNA测试题库及答案

完整版CCNA测试题库及答案

完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测(CSMA/CD)的工作原理。

CSMA/CD是一种帮助设备均衡共享带宽的协议,可避免两台设备同时在网络介质上传输数据。

虽然他不能消除冲突,但有助于极大的减少冲突,进而避免重传,从而提高所的设备的数据传输效率。

区分半双工和全双工通信。

并指出两种方法的需求。

与半双工以太网使用一对导线不同,全双工以太网使用两队导线,全双工使用不同的导线来消除冲突,从而允许同时发送和接收数据,而半双工可接收或发送数据,但不能同时接收和发送数据,且仍会出现冲突。

要使用全双工,电缆两端的设备都必须支持全双工,并配置成一全双模式运行。

描述MAC地址的组成部分以及各部分包含的信息。

MAC(硬件)地址时一种使用十六进制表示的地址,长48位(6B)。

其中前24位(3B)称为OUI(Organizationally Unique Idebtifier,组织唯一表示符),有IEEE分配给NIC制造商;余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。

用这三种格式之一表示的任何数字都可以转换为其他两种格式,能够执行这种转换对理解IP地址和子网划分至关重要。

识别以太网帧中与数据链路层相关的字段。

在以太网中,与数据链路层相关的字段包括前导码,帧其实位置分隔符,目标MAC地址,源MAC地址,长度或者类型以及帧校验序列。

识别以太网布线相关的IEEE标准。

这些标准描述了各种电缆类型的功能和物理特征,包括(但不限于)10Base2、10Base5和10BaseT。

区分以太网电缆类型及其用途。

以太网电缆分3种:直通电缆,用于将PC或路由器的以太网接口连接到集线器或交换机;交叉电缆。

用于将集线器连接到集线器,集线器连接到交换机,交换机连接到交换机以及PC连接到PC;反转电缆,用于PC和路由器或交换机之间建立控制台连接。

描述数据封装过程及其在分组创建中的作用。

数据封装指的是在OSI模型各层给数据添加信息的过程,也成为分组创建。

CCNA认证试题-15页word资料

CCNA认证试题-15页word资料

CCNA认证试题一(附答案和解析)中文版一) 认证试题一(附答案和解析)中文版(一CCNA1 2019-09-30 15:49:59 阅读139 评论0 字号:大中小订阅1、目前,我国应用最为广泛的LAN 标准是基于()的以太网标准. (A) IEEE 802.1 (B) IEEE 802.2 (C) IEEE 802.3 (D) IEEE 802.5 答案:C 参考知识点:现有标准:IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDI IEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5 的定义以太网是一种计算机局域网组网技术IEEE 制定的IEEE 802.3 标准给出了以太。

网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准,如令牌环、FDDI 和ARCNET。

以太网的标准拓扑结构为总线型拓扑,但目前的快速以太网(100BASE-T、1000BASE-T 标准)为了最大程度的减少冲突,最大程度的提高网络速度和使用效率,使用交换机(Switch)来进行网络连接和组织,这样,以太网的拓扑结构就成了星型,但在逻辑上,以太网仍然使用总线型拓扑的C***A/CD 介质访问控制方法。

电气电子工程师协会或IEEE(Institute of Electrical and Electronics Engineers)是一个国际性的电子技术与信息科学工程师的协会。

建会于1963 年1 月1 日。

总部在美国纽约市。

在150 多个国家中它拥有300 多个地方分会。

目前会员数是36 万。

专业上它有35 个专业学会和两个联合会。

IEEE 发表多种杂志,学报,书籍和每年组织300 多次专业会议。

CCNA认证试题(中文+答案)

CCNA认证试题(中文+答案)

CCNA认证试题一(附答案和解析)中文版(一)1、目前,我国应用最为广泛的LAN标准是基于()的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案:C参考知识点:现有标准:IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准,如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑,但目前的快速以太网(100BASE-T、1000BASE-T标准)为了最大程度的减少冲突,最大程度的提高网络速度和使用效率,使用交换机(Switch)来进行网络连接和组织,这样,以太网的拓扑结构就成了星型,但在逻辑上,以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法。

电气电子工程师协会或IEEE(Institute of Electrical and Electronics Engineers)是一个国际性的电子技术及信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志,学报,书籍和每年组织300多次专业会议。

IEEE定义的标准在工业界有极大的影响。

下面列出:IEEE802.3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T(快速以太网)802.3z-------- 1000Base-X(光纤吉比特以太网)802.3ab-------- 1000Base-T(双绞线吉比特以太网)2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: ()(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案:CE注:IP地址中关键是看她的主机位,将子网掩码划为二进制,1对应上面的地址是网络位,0对应的地址是主机位192.168.19.255/20划为二进制为:11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址:10.0.0.0 - 10.255.255.255(10/8 prefix)172.16.0.0 - 172.31.255.255 (1 72.16/12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时,下列哪些项没有发生变化(假定没有使用地址转换技术)?()(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案:ABCD参考知识点:路由功能就是指选择一条从源网络到目的网络的路径,并进行数据包的转发。

鸿鹄论坛_CCNA中文版本题库(谷歌翻译,有错误自行纠正)

鸿鹄论坛_CCNA中文版本题库(谷歌翻译,有错误自行纠正)

1、请参见图示。

当收到下列帧将会怎么做?(选择三项。

)ACFA. Router1的将剥离的源MAC地址,并将其与MAC地址0000.0c36.6965取代。

B. Router1的将剥离的源IP地址,并将其与IP地址192.168.40.1取代。

C.router1将剥离的目的MAC地址,并将其与MAC地址代替0000.0c07.4320。

D.router1将剥离的目的IP地址,并将其与192.168.40.1的IP地址替换。

E. Router1的将转发数据包输出接口的FastEthernet0/1。

F.router1将转发数据包输出接口的FastEthernet0/2。

2、请参见图示。

哪三种说法正确描述了网络设备A?(选择三项。

)BDEA.使用255.255.255.128子网掩码时,在各接口不需要的IP地址。

B.使用255.255.255.128子网掩码时,在各接口确实需要一个唯一的IP地址IP子网。

C.为255.255.255.0的子网掩码时,必须是一个二层设备的电脑进行通信彼此。

D.为255.255.255.0的子网掩码时,必须是一个三层设备的电脑进行通信彼此。

E.使用255.255.254.0的子网掩码时,每个接口并不需要一个IP地址。

3、OSI中那一层负责决定一个进程的可用性并查看是否有可用的资源分给该进程?EA.传输B.网络D.会话E.应用4、以下哪项描述了WAN设备的角色?(选择三项。

)A.CSU/ DSU用于端接本地数字环路B.调制解调器端接本地数字环路C.一个CSU/ DSU终止模拟本地环路D.调制解调器终止模拟本地环路E.路由器通常被视为DTE设备F.路由器通常被视为DCE设备注:SU/DSU是用于连接终端和数字专线的设备,属于DCE设备modem用于数字信号和模拟信号的转换,属于DCE设备路由器一般是DTE设备5、请参见图示,主机A ping接口S0/0的router3,什么是该ping的TTL值?A. 253B. 252C. 255D. 2546、网络管理员可以通过建立一个FTP连接到远程服务器验证新安装的主机的配置。

CCNA中文版本题库 部分

CCNA中文版本题库 部分

A.主机B将不能访问该服务器在VLAN9,直到电缆连接B.对于不到一分钟,主机B将无法访问服务器VLAN9.然后正常的网络功能将恢复。

C.VLAN和其他VLAN之间的通信,应禁用D.文件从主机B在VLAN9转印到服务器将是显著慢。

注:图中交换机存在环路,有一个端口会处于堵塞状态。

当F0/9 down之后,STP重新计算,在汇聚之前VLAN3不能访问VLAN9,端口汇聚之后恢复正常D说hostB访问VLAN 9中的server会变慢。

不同vlan之间的通信需要通过网关转发,并不是switch1直接转发给switch3,所以这里访问速度不会变。

172、主机A无法ping通HostB的。

假设路由配置是否正确,这可能是这个问题的原因是什么?A.主机A不是在同一子网作为其默认网关B. SwitchA的地址是一个子网地址C.该Fa0 / 0接口在RouterA是不能使用的子网D.路由器的串行接口不在同一子网E.该Fa0 / 0接口在RouterB上使用的是广播地址173、哪个端口状态由快速PVST出台?A. learning(学习)B. listening(侦听)C. discarding(丢弃---Rpvst新增了一种端口角色----discarding)D. forwarding(转发)174、交换机上的两个连接的端口无法运转橙色或绿色亮起。

什么是最有效的步骤来解决这个物理层问题?(选择三项。

)A:确认以太网封装是否匹配,错误。

封装错误不会在端口LED显示B:确认线缆A/B是否为直通线,正确。

异构设备使用直通线C:确认线缆A是否插到trunk口,错误。

D:确认是否通电,正确。

E:重启设备,错误。

F:重置所有电缆,正确。

注:考查交换机端口颜色的定义。

绿色正常,橘黄色有故障。

175、网络管理员试图从主机1 ping通主机2和接收显示的结果。

什么是可能出现的问题?A.主机1和交换机1之间的链路中断。

B. TCP/ IP不正常的主机1。

CCNA考试题

CCNA考试题

C C N A考试题(总9页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面,使用请直接删除第一部分:选择题1:提供可靠数据传输、流控的是OSI的第几层()A、表示层B、网络层C、传输层D、会话层E、链路层2:子网掩码产生在那一层()A、表示层B、网络层C、传输层D、会话层3:当路由器接收的IP报文的目的地址不是本路由器的接口IP地址,并且在路由表中未找到匹配的路由项,采取的策略是()A、丢掉该分组B、将该分组分片C、转发该分组D、以上答案均不对4:当一台主机从一个网络移到另一个网络时,以下说法正确的是()A、必须改变它的IP地址和MAC地址B、必须改变它的IP地址,但不需改动MAC地址C、必须改变它的MAC地址,但不需改动IP地址D、MAC地址、IP地址都不需改动5:ISO提出OSI的关键是()A、系统互联B、提高网络速度C、为计算机制定标准D、经济利益6:OSI参考模型按顺序有哪些层()A、应用层、传输层、网络层、物理层B、应用层、表示层、会话层、网络层、传输层、数据链路层、物理层C、应用层、表示层、会话层、传输层、网络层、数据链路层、物理层D、应用层、会话层、传输层、物理层7:LAN的拓扑形式一般以()为主。

A、总线型B、环型C、令牌环D、载波侦听与冲突检测CSMA/CD8:网段地址154.27.0.0的网络,若不做子网划分,能支持()台主机A、254B、1024C、65,534D、16,777,2069:路由器网络层的基本功能是()。

A、配置IP地址B、寻找路由和转发报文C、将MAC地址解释成IP地址10:选出基于TCP协议的应用程序()。

A、PINGB、TFTPC、TELNETD、OSPF11:某公司申请到一个C类IP地址,但要连接6个的子公司,最大的一个子公司有26台计算机,每个子公司在一个网段中,则子网掩码应设为()。

A、255.255.255.0B、255.255.255.128C、255.255.255.192D、255.255.255.22412:B类地址的缺省掩码是()。

CCNA英文试题_(含答案)

CCNA英文试题_(含答案)

1. Refer to the exhibit. What could bepossible causes for the "Serial0/0 is down"interfacestatus? (Choosetwo.)A. A Layer 1 problem exists.B. The bandwidth is set too low.C. A protocol mismatch exists.D. An incorrect cable is being used.E. There is an incorrect IP address on the Serial 0/0 interface.Answer: AD2. Before installing a new, upgraded version of the IOS, what should be checked on the router, andwhichcommand should be used to gather this information? (Choose two.)A. the amount of available ROMB. the amount of available flash and RAM memoryC. the version of the bootstrap software present on the routerD. show versionE. show processesF. show running-configAnswer: BD3. Refer to the exhibit. Which two statements are true about interVLAN routing in the topologythat is shownin the exhibit? (Choose two.)中国思科华为3COM 网络技术发布A. Host E and host F use the same IP gateway address.B. Router1 and Switch2 should be connected via a crossover cable.C. Router1 will not play a role in communications between host A and hostD.D. The FastEthernet 0/0 interface on Router1 must be configured with subinterfaces.E. Router1 needs more LAN interfaces to accommodate the VLANs that are shown in the exhibit.F. The FastEthernet 0/0 interface on Router1 and Switch2 trunk ports must be configured using thesameencapsulation type.Answer: DF4. Refer to the exhibit. Which two statements are true about the loopback address that isconfigured onRouterB? (Choose two.)A. It ensures that data will be forwarded by RouterB.B. It provides stability for the OSPF process on RouterB.中国思科华为3COM 网络技术发布C. It specifies that the router ID for RouterB should be 10.0.0.1.D. It decreases the metric for routes that are advertised from RouterB.E. It indicates that RouterB should be elected the DR for the LAN.Answer: BC5. A network administrator is explaining VTP configuration to a new technician. What should thenetworkadministrator tell the new technician about VTP configuration? (Choose three.)A. A switch in the VTP client mode cannot update its local VLAN database.B. A trunk link must be configured between the switches to forward VTP updates.C. A switch in the VTP server mode can update a switch in the VTP transparent mode.D. A switch in the VTP transparent mode will forward updates that it receives to other switches.E. A switch in the VTP server mode only updates switches in the VTP client mode that have a higherVTPrevision number.F. A switch in the VTP server mode will update switches in the VTP client mode regardless of the configured VTP domain membership.Answer: ABD6. Which two locations can be configured as a source for the IOS image in the boot system command?(Choose two.)A. RAMB. NVRAMC. flash memoryD. HTTP serverE. TFTP serverF. TelnetserverAnswer: CE7. What are two reasons a network administrator would use CDP? (Choose two.)A. to verify the type of cable interconnecting two devicesB. to determine the status of network services on a remote deviceC. to obtain VLAN information from directly connected switchesD. to verify Layer 2 connectivity between two devices when Layer 3 failsE. to obtain the IP address of a connected device in order to telnet to the deviceF. to determine the status of the routing protocols between directly connected routersAnswer: DE中国思科华为3COM 网络技术发布8. Refer to the exhibit. Both switches are using a default configuration. Which two destinationaddresses willhost 4 use to send data to host 1? (Choose two.)A. the IP address of host 1B. the IP address of host 4C. the MAC address of host 1D. the MAC address of host 4E. the MAC address of the Fa0/0 interface of the R1 routerF. the MAC address of the Fa0/1 interface of the R1 routerAnswer: AF9. Refer to the exhibit. The router has been configured with these commands:hostname Gatewayinterface FastEthernet 0/0ip address 198.133.219.14 255.255.255.248no shutdowninterface FastEthernet 0/1ip address 192.168.10.254 255.255.255.0no shutdowninterface Serial 0/0ip address 64.100.0.2 255.255.255.252no shutdownip route 0.0.0.0 0.0.0.0 64.100.0.1What are the two results of this configuration? (Choose two.)中国思科华为3COM 网络技术发布A. The default route should have a next hop address of 64.100.0.3.B. Hosts on the LAN that is connected to FastEthernet 0/1 are using public IP addressing.C. The address of the subnet segment with the WWW server will support seven more servers.D. The addressing scheme allows users on the Internet to access the WWW server.E. Hosts on the LAN that is connected to FastEthernet 0/1 will not be able to access the Internetwithoutaddress translation.Answer: DE10. A company is installing IP phones. The phones and office computers connect to the same device.Toensure maximum throughput for the phone data, the company needs to make sure that the phonetraffic ison a different network from that of the office computer data traffic. What is the best networkdevice to whichto directly connect the phones and computers, and what technology should be implemented on thisdevice?(Choose two.)A. hubB. routerC. switchD. STPE. subinterfacesF. VLANAnswer: CF11. What are two benefits of using VTP in a switching environment? (Choose two.)中国思科华为3COM 网络技术发布A. It allows switches to read frame tags.B. It allows ports to be assigned to VLANs automatically.C. It maintains VLAN consistency across a switched network.D. It allows frames from multiple VLANs to use a single interface.E. It allows VLAN information to be automatically propagated throughout the switching environment.Answer: CE12. Which two statements are true about the command ip route172.16.3.0 255.255.255.0 192.168.2.4?(Choose two.)A. It establishes a static route to the 172.16.3.0 network.B. It establishes a static route to the 192.168.2.0 network.C. It configures the router to send any traffic for an unknown destination to the 172.16.3.0network.D. It configures the router to send any traffic for an unknown destination out the interface withthe address192.168.2.4.E. It uses the default administrative distance.F. It is a route that would be used last if other routes to the same destination exist.Answer: AE13. What are two advantages of Layer 2 Ethernet switches over hubs? (Choose two.)A. decreasing the number of collision domainsB. filtering frames based on MAC addressesC. allowing simultaneous frame transmissionsD. increasing the size of broadcast domainsE. increasing the maximum length of UTP cabling between devicesAnswer: BC14. Refer to the exhibit. A network associate needs to configure the switches and router in thegraphic sothat the hosts in VLAN3 and VLAN4 can communicate with the enterprise server in VLAN2. Which twoEthernet segments would need to be configured as trunk links? (Choose two.)中国思科华为3COM 网络技术发布A. AB. BC. CD. DE. EF. FAnswer: CF15. Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)A. amount of RAMB. bridge priorityC. IOS versionD. IP addressE. MAC addressF. speed of the linksAnswer: BE16. Refer to the exhibit. Assume that the routing protocol referenced in each choice below isconfigured withits default settings and the given routing protocol is running onall the routers. Which twoconditionalstatements accurately state the path that will be chosen between networks 10.1.0.0 and 10.3.2.0for therouting protocol mentioned? (Choose two.)中国思科华为3COM 网络技术发布A. If OSPF is the routing protocol, the path will be from R1 to R3to R4 to R5.B. If OSPF is the routing protocol, the path will be from R1 to R2to R5.C. If OSPF is the routing protocol, the path will be from R1 to R5.D. If RIPv2 is the routing protocol, the path will be from R1 to R3to R4 to R5.E. If RIPv2 is the routing protocol, the path will be from R1 to R5.Answer: AE17. Refer to the exhibit. A network administrator is adding two new hosts to SwitchA. Which threevaluescould be used for the configuration of these hosts? (Choose three.)A. host A IP address: 192.168.1.79。

新10月CCNA题库word版1~100题共24页

新10月CCNA题库word版1~100题共24页

QUESTION 1When you are logged into a switch, which prompt indicates that you are in privileged mode?A. %B. @C. >D. $E. #QUESTION 2Which command shows system hardware and software version information?A. show configurationB. show environmentC. show inventoryD. show platformE. show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Qtrunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 thenative VLAN is not specified.What will happen in this scenario?A. 802.1Q giants frames could saturate the link.B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native VLAN mismatch error message will appear.D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.QUESTION 4Which command would correctly configure a serial port on a router with the last usable host address in the192.216.32.32/29 subnet?A. Router(config-if)# ip address 192.216.32.38 255.255.255.240B. Router(config-if)# ip address 192.216.32.39 255.255.255.224C. Router(config-if)# ip address 192.216.32.63 255.255.255.248D. Router(config-if)# ip address 192.216.32.39 255.255.255.248E. Router(config-if)# ip address 192.216.32.63 255.255.255.248F. Router(config-if)# ip address 192.216.32.38 255.255.255.248QUESTION 5The network default gateway applying to a host by DHCP is 192.168.5.33/28. Which option is the valid IPaddress of this host?A. 192.168.5.55B. 192.168.5.47C. 192.168.5.40D. 192.168.5.32E. 192.168.5.14QUESTION 6Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two.)A. 113.10.4.0B. 186.54.3.0C. 175.33.3.255D. 26.35.2.255E. 17.35.36.0QUESTION 7The network administrator has asked you to check the status of the workstation's IP stack by pinging theloopback address. Which address would you ping to perform this task?A. 10.1.1.1B. 127.0.0.1C. 192.168.0.1D. 239.1.1.1QUESTION 8Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IPaddress of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts toping between the hosts are unsuccessful. What two things can be done to allow communications betweenthe hosts? (Choose two.)A. Replace the straight-through cable with a crossover cable.B. Change the subnet mask of the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to 192.0.2.15.E. Change the address of Workstation B to 192.0.2.111.QUESTION 9Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have alsogiven you the default gateway address of 223.5.14.7. After you have configured the address, the router isunable to ping any remote devices. What is preventing the router from pinging remote devices?A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D. The IP address is an invalid class D multicast address.QUESTION 10Which command is used to copy the configuration from RAM into NVRAM?A. copy running-config startup-configB. copy startup-config: running-config:C. copy running config startup configD. copy startup config running configE. write terminalQUESTION 11Which command is used to load a configuration from a TFTP server and merge the configuration intoRAM?A. copy running-config: TFTP:B. copy TFTP: running-configC. copy TFTP: startup-configD. copy startup-config: TFTP:QUESTION 12A system administrator types the command to change the hostname of a router. Where on the Cisco IFS isthat change stored?A. NVRAMB. RAMC. FLASHD. ROME. PCMCIAQUESTION 13Which command is used to configure a default route?A. ip route 172.16.1.0 255.255.255.0 0.0.0.0B. ip route 172.16.1.0 255.255.255.0 172.16.2.1C. ip route 0.0.0.0 255.255.255.0 172.16.2.1D. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?(Choose two.)A. ip default-gateway 0.0.0.0B. ip route 172.16.2.1 0.0.0.0 0.0.0.0C. ip default-network 0.0.0.0D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1E. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 15Which command would you configure globally on a Cisco router that would allow you to view directlyconnected Cisco devices?A. enable cdpB. cdp enableC. cdp runD. run cdpQUESTION 16Which command is used to see the path taken by packets across an IP network?A. show ip routeB. show routeC. tracerouteD. trace ip routeQUESTION 17Which command is used to debug a ping command?A. debug icmpB. debug ip icmpC. debug tcpD. debug packetQUESTION 18Which command displays CPU utilization?A. show protocolsB. show processC. show systemD. show versionQUESTION 19When configuring a serial interface on a router, what is the default encapsulation?A. atm-dxiB. frame-relayC. hdlcD. lapbE. pppQUESTION 20What must be set correctly when configuring a serial interface so that higher-level protocols calculate thebest route?A. bandwidthB. delayC. loadD. reliabilityQUESTION 21A company implements video conferencing over IP on their Ethernet LAN. The users notice that thenetwork slows down, and the video either stutters or fails completely. What is the most likely reason forthis?A. minimum cell rate (MCR)B. quality of service (QoS)C. modulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)QUESTION 22Which layer in the OSI reference model is responsible for determining the availability of the receivingprogram and checking to see if enough resources exist for that communication?A. transportB. networkC. presentationD. sessionE. applicationQUESTION 23Data transfer is slow between the source and destination. The quality of service requested by the transportlayer in the OSI reference model is not being maintained. To fix this issue, at which layer should thetroubleshooting process begin?A. presentationB. sessionC. transportD. networkE. physicalQUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for pathdetermination and traffic switching?A. LANB. routingC. WAND. networkQUESTION 25Which command reveals the last method used to powercycle a router?A. show reloadB. show bootC. show running-configD. show versionQUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3CCNA考试报名1700元7F. ATMQUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPQUESTION 28What is the difference between a CSU/DSU and a modem?A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signalsfrom a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signalsfrom a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signalsfrom a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signalsfrom a router to a phone line.QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attachedCCNA考试报名1700元8host devices. What would be the most efficient way to configure MAC-level security on all these ports?A. Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port securitymac-address command.B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port securitymac-address command.C. Use the switchport port-security MAC address sticky command on all the switch ports that have enddevices connected to them.D. Use show mac-address-table to determine the addresses that are associated with each portand thenenter the commands on each switch for MAC address port-security.QUESTION 30When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?A. Set the encapsulation of the interface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verify that the encapsulation is set to Frame Relay.What occurs on a Frame Relay network when the CIR is exceeded?A. All TCP traffic is marked discard eligible.B. All UDP traffic is marked discard eligible and a BECN is sent.C. All TCP traffic is marked discard eligible and a BECN is sent.D. All traffic exceeding the CIR is marked discard eligible.QUESTION 32What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)A. They create split-horizon issues.B. They require a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for full-mesh topologies.E. They require the use of NBMA options when using OSPF.QUESTION 33Refer to the exhibit. Addresses within the range 10.10.10.0/24 are not being translated to the 1.128.0/16range. Which command shows if 10.10.10.0/24 are allowed inside addresses?A. debug ip natB. show access-listC. show ip nat translationD. show ip nat statisticsQUESTION 34A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of theaccess point does not list any active WLAN clients. What is a possible reason for this?A. The incorrect channel is configured on the client.B. The client's IP address is on the wrong subnet.C. The client has an incorrect pre-shared key.D. The SSID is configured incorrectly on the client.QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)CCNA考试报名1700元10艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyA. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersQUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. WEPB. CCKMC. AESD. TKIPE. CCMPQUESTION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathQUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXCCNA考试报名1700元11艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXQUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.QUESTION 40Refer to the exhibit. According to the routing table, where will the router send a packet destined for10.1.5.65?A. 10.1.1.2B. 10.1.2.2C. 10.1.3.3D. 10.1.4.4QUESTION 41Which command shows if an access list is assigned to an interface?A. show ip interface [interface] access-listsB. show ip access-lists interface [interface]C. show ip interface [interface]D. show ip access-lists [interface]QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address is removed from the pool until the conflict is resolved.B. The address remains in the pool until the conflict is resolved.C. Only the IP detected by Gratuitous ARP is removed from the pool.D. Only the IP detected by Ping is removed from the pool.E. The IP will be shown, even after the conflict is resolved.QUESTION 43Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to seeoutput from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceQUESTION 44Refer to the exhibit. If number 2 is selected from the setup script, what happens when the user runs setupfrom a privileged prompt?A. Setup is additive and any changes will be added to the config script.B. Setup effectively starts the configuration over as if the router was booted for the first time.C. Setup will not run if an enable secret password exists on the router.D. Setup will not run, because it is only viable when no configuration exists on the router. QUESTION 45Refer to the exhibit. Which (config-router) command will allow the network represented on the interface tobe advertised by RIP?A. redistribute ethernet0B. network ethernet0CCNA考试报名1700元14艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyC. redistribute 10.12.0.0D. network 10.12.0.0QUESTION 46Refer to the exhibit. What information can be gathered from the output?A. One router is running RIPv1.B. RIP neighbor is 224.0.0.9.C. The network contains a loop.D. Network 10.10.1.0 is reachable.QUESTION 47Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to routerD. router to routerQUESTION 48Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to switchD. switch to routerQUESTION 49Which two statements describe the Cisco implementation of VLANs? (Choose two.)A. VLAN 1 is the default Ethernet VLAN.B. CDP advertisements are only sent on VLAN 1002.C. By default, the management VLAN is VLAN 1005.D. By default, the switch IP address is in VLAN 1005.E. VLAN 1002 through 1005 are automatically created and cannot be deleted.QUESTION 50Refer to the exhibit. What can be determined about the router from the console output?A. No configuration file was found in NVRAM.B. No configuration file was found in flash.C. No configuration file was found in the PCMCIA card.D. Configuration file is normal and will load in 15 seconds.QUESTION 52Refer to the exhibit. Which command would allow the translations to be created on the router?A. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 19B. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 19C. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 18D. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 18QUESTION 53Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output asshown. At which OSI layer is the problem?A. data link layerB. application layerC. access layerD. session layerE. network layerQUESTION 54Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?A. 10.0.0.0B. 10.0.0.254C. 192.223.129.0D. 192.223.129.254QUESTION 55Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A?A. The IP address for Server A is a broadcast address.B. The IP address for Workstation B is a subnet address.C. The gateway for Workstation B is not on the same subnet.D. The gateway for Server A is not on the same subnet.QUESTION 56Refer to the exhibit. What does the (*) represent in the output?A. Packet is destined for a local interface to the router.B. Packet was translated, but no response was received from the distant device.C. Packet was not translated, because no additional ports are available.D. Packet was translated and fast switched to the destination.QUESTION 57Refer to the exhibit. What command sequence will enable PAT from the inside to outside network?A. (config) ip nat pool isp-net 1.2.4.2 netmask 255.255.255.0 overloadB. (config-if) ip nat outside overloadC. (config) ip nat inside source list 1 interface ethernet1 overloadD. (config-if) ip nat inside overloadQUESTION 58Refer to the exhibit. What will happen to HTTP traffic coming from the Internet that is destined for172.16.12.10 if the traffic is processed by this ACL?A. Traffic will be dropped per line 30 of the ACL.B. Traffic will be accepted per line 40 of the ACL.C. Traffic will be dropped, because of the implicit deny all at the end of the ACL.D. Traffic will be accepted, because the source address is not covered by the ACL.QUESTION 59Refer to the exhibit. Which statement describes the effect that the Router1 configuration has on devices inthe 172.16.16.0 subnet when they try to connect to SVR-A using Telnet or SSH?A. Devices will not be able to use Telnet or SSH.B. Devices will be able to use SSH, but not Telnet.C. Devices will be able to use Telnet, but not SSH.D. Devices will be able to use Telnet and SSH.QUESTION 60What are three advantages of VLANs? (Choose three.)A. VLANs establish broadcast domains in switched networks.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a method of conserving IP addresses in large networks.D. VLANs provide a low-latency internetworking alternative to routed networks.E. VLANs allow access to network services based on department, not physical location.F. VLANs can greatly simplify adding, moving, or changing hosts on the network.QUESTION 61An administrator would like to configure a switch over a virtual terminal connection from locations outsideof the local LAN. Which of the following are required in order for the switch to be configured from a remotelocation? (Choose two.)A. The switch must be configured with an IP address, subnet mask, and default gateway.B. The switch must be connected to a router over a VLAN trunk.C. The switch must be reachable through a port connected to its management VLAN.D. The switch console port must be connected to the Ethernet LAN.E. The switch management VLAN must be created and have a membership of at least one switch port.F. The switch must be fully configured as an SNMP agent.QUESTION 62Which of the following host addresses are members of networks that can be routed across the publicInternet? (Choose three.)A. 10.172.13.65B. 172.16.223.125C. 172.64.12.29D. 192.168.23.252E. 198.234.12.95F. 212.193.48.254QUESTION 63Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to networkhosts? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.192QUESTION 64Which of the following are benefits of VLANs? (Choose three.)A. They increase the size of collision domains.B. They allow logical grouping of users by function.C. They can enhance network security.D. They increase the size of broadcast domains while decreasing the number of collision domains.E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.F. They simplify switch administration.Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose three.)A. pingB. tracertC. ipconfigD. show ip routeE. winipcfgF. show interfacesQUESTION 67。

CCNA中文试题

CCNA中文试题

一、为了提高(加强)企业网的安全性,网络管理员使用ACL(访问控制列表)。

下列哪两个原因将使网络管理员使用访问控制列表?1.控制vty访问路由器时To control vty access into a router2.当数据包流过路由器时,对数据包进行过滤的时候。

To filter traffic as it passes through a router.二、当你是某网站的管理员时,为了提高交换网络的安全性,请参考下面意见,哪两个方法可以在思科交换机上的第二层协议上安全实现?1.禁止交换机建立协商通路。

disable trunk negotation on the switch2.为交换机连接主机的接口进行适当的配置。

configure a switch port host where appropriate三、一个802.11g的AP已经被配置并且安装在一个正方形的办公室中央,一些无线用户有丢包和性能下降现象,而大多使用户工作正常。

从下面列表中找出哪三个是可能的原因?1.无线电话(手机)cordlee phones;2.金属文件橱柜metal file cabinets;3.无线类型或天线指向antenna type or direction;四、参考图示,连接在交换机上的两个接口没有变黄或者变绿,下面哪些方法是最有效的调试物理层问题的方法?(选3个)1.确保电缆A,B是直通线Ensure that cables A and B are straight-through cables2.重做所有电缆Reseat all cables3.确保交换机有电工作正常Ensure the P4S-S has power五、一个网络管理员正在配置一个路由器,使他成为一个帧中继中星型的布局中的集线器。

下面那个是在路由器上使用点到点子接口代替多点接口的优点?1.它可以避免距离矢量路由协议中的负载平衡问题It avoids split-horizon issues with distance vector routing protocols六、如图所示,图中无线局域网运行了哪两个设备管理系统?(选2)1、网络图中显示的一个长期运行的一套系统是ESS(主管支持系统)The network diagram represents an extended service set(ESS)2、两个APS(辅助推进系统)应该被配置在不同的通道起作用。

CCNA中文版试题

CCNA中文版试题

CCNA认证试题一(附答案和解析)中文版(一)CCNA1 2007-09-30 15:49:59 阅读139 评论0 字号:大中小订阅1、目前,我国应用最为广泛的LAN标准是基于()的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案:C参考知识点:现有标准:IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准,如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑,但目前的快速以太网(100BASE-T、1000BASE-T标准)为了最大程度的减少冲突,最大程度的提高网络速度和使用效率,使用交换机(Switch)来进行网络连接和组织,这样,以太网的拓扑结构就成了星型,但在逻辑上,以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法。

电气电子工程师协会或IEEE(Institute of Electrical and Electronics Engineers)是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志,学报,书籍和每年组织300多次专业会议。

IEEE 定义的标准在工业界有极大的影响。

下面列出:IEEE802.3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T(快速以太网)802.3z-------- 1000Base-X(光纤吉比特以太网)802.3ab-------- 1000Base-T(双绞线吉比特以太网)2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: ()(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案:CE注:IP地址中关键是看她的主机位,将子网掩码划为二进制,1对应上面的地址是网络位,0对应的地址是主机位192.168.19.255/20划为二进制为:11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址:10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时,下列哪些项没有发生变化(假定没有使用地址转换技术)?()(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案:ABCD参考知识点:路由功能就是指选择一条从源网络到目的网络的路径,并进行数据包的转发。

思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案培训资料

思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案培训资料

思科认证考试(C C N A)考试模拟题集锦(1-71题)及答案思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案19及答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header? a) 96b) 47c) a random number above 1024d) 69e) none of the above2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet interfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.33. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the above4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addresses5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routec) show ip arpd) show arpe) there is no way to display the ARP cache6. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the above8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-IS9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ram10. [CxNx] Which of the following explains the correct definition of administrative distance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the highest administrative distance will take priority.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes place12. [RINx] How many subnets are possible with a Class C address and a subnet mask of255.255.255.252?a) 32b) 30c) 60d) 62e) 413. [RxNx] What commands will list all protocols that are currently being routed? (Choosea) show ip protocolb) show protocolc) show rund) show starte) All of the above14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.15. [xxNx] If the access-group command is configured on an interface and there is noaccess-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network only17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.e) The packet will be removed by the token monitor.Coding Key and InformationThe first character represents the category of question.A - ATMB - BridgingC - Cisco specificE - EthernetF - Frame relayH - HDLCI - FDDIN - ISDNO - OSI modelP - PPPR - RoutingS - SwitchingT - Token ringX - X.25x - Not applicableThe second character represents protocol.A - AppletalkB - Banyan VinesD - DecnetI - IPL - Dial on DemandN - NLSPO - OSPFX - IPXx - Not ApplicableThe third character represents the certification that the question will help you prepare for.N - CCNA Exam #640-407P - CCNPAdvanced Cisco Router Configuration (ACRC) Exam 640-403Cisco LAN Switch Configuration (CLSC) Exam #640-404Cisco Monitoring and Troubleshooting Dial-up Services Exam #640-405Cisco Internetworking Troubleshooting ( CIT) Exam #640-406D - CCDA & CCDPCisco Design Specialist Exam #9E0-004Cisco Internetwork Design#640-025We will reserve the fourth character for future use.As an example, when you come across a question coded "BXDx", it signifies a question that will help you gain the CCDA or CCDP certification.CCNA试题1-19答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal,a) 96b) 47c) a random number above 1024d) 69e) none of the aboveAnswerd) 69Here is a sampling of other port numbers and the application they are associated with. The first 8 of these protocols are automatically forwarded through the router by using thehelper-address commandTrivial File Transfer (TFTP) (port 69)Domain Name System (port 53)IEN-116 Name Server (port 42)Time service (port 37)NetBIOS Name Server (port 137)NetBIOS Datagram Server (port 138)Boot Protocol (BootP) client and server datagrams (port 67)TACACS service (port 49)Simple Mail Transfer Protocol (25)File Transfer Protocol (21)Simple Network Management Protocol (161)2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet inte rfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.3Answerb) ARPASNAP is the default encapsulation for a token ring interface NOVELL-ETHER is the default encapsulation for a ipx interface.3. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the aboveAnswera) ip address 1.1.1.1 255.255.255.0If you are not in the configuration mode, the ip address can be set by using the setup mode. Configuring interface Ethernet0/0:Is this interface in use? [yes]:IP address for this interface [10.10.10.1]: 10.10.10.1Number of bits in subnet field [16]: 16Class A network is 10.0.0.0, 16 subnet bits; mask is /24Take note when using the setup mode the mask is configured using the number of subnet bits.4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addressesAnswerc) show ip interfaced) show interfaceExamples of each of these commands are shown below:Router_A#sh int e0/0Ethernet0/0 is up, line protocol is upHardware is AmdP2, address is0010.7b15.bd41(bia 0010.7b15.bd41)Internet address is 10.10.10.1/24MTU 1500 bytes, BW 10000 Kbit,DLY 1000 usec,rely 255/255, load 1/255Encapsulation ARPA, loopback not set,keepalive set (10 sec)ARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:06,output hang neverLast clearing of "show interface"counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops;input queue 0/75,0 drops5 minute input rate 0 bits/sec,0 packets/sec5 minute output rate 0 bits/sec,0 packets/sec0 packets input, 0 bytes,0 no bufferReceived 0 broadcasts, 0 runts,0 giants,0 throttles, 0 input errors, 0 CRC,0 frame, 0 overrun, 0 ignored,0 input packets with dribblecondition detected127 packets output, 11802 bytes,0 underruns0 output errors, 0 collisions,2 interface resets0 babbles, 0 late collision,0 deferred0 lost carrier, 0 no carrier0 output buffer failures, 0 outputbuffers swapped outRouter_A#sh ip int e0/0Ethernet0/0 is up, line protocol is upInternet address is 10.10.10.1/24Broadcast address is 255.255.255.255Address determined bynon-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is enabledOutgoing access list is not setInbound access list is not setProxy ARP is enabledSecurity level is defaultSplit horizon is enabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the sameinterface is disabledIP multicast fast switching is enabledRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting isdisabledTCP/IP header compression is disabledProbe proxy name replies are disabledGateway Discovery is disabledPolicy routing is disabledNetwork address translation is disabled5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routed) show arpe) there is no way to display the ARP cacheAnswerc) show ip arpExample:Router_A#sh ip arpProtocol Address Age(min) Hardware Address Type InterfaceInternet 1.1.1.2 - 0010.7b15.bd50 ARPA FastEthernet1/0Internet 10.10.10.1 - 0010.7b15.bd41 ARPA Ethernet0/06. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.e)There is no such process.Answera) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.Choice C describes Address Resolution Protocol (ARP). A host never has to resolve it’s o wn MAC address. The MAC address is burned into the Network Interface card. When the host is booted the MAC address will be loaded into memory.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the aboveAnswera) Telnetb) FTPTFTP and SNMP use layer 4 UDP.8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-ISb) OSPFe) IS-ISA link state routing protocol advertises, to it’s neighbors, the state of the link whenthe state of the link changes.A distance vector routing protocol advertises its routing table periodically.9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ramAnswerc) clear arp-cacheIf you have changed an ip address or a NIC card on a host you might use this command toreset the cache.10. [CxNx] Which of the following explains the correct definition of administrativedistance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with thehighest administrative distance will take priority.Answerd) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.Cisco uses administrative distances (AD) to measure the reliability of the routing protocol. The lower the (AD) the more reliable the protocol.Router_C#sh ip routeCodes: C - connected, S - static,I - IGRP, R - RIP,M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF,IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPFNSSA external type 2E1 - OSPF external type 1,E2 - OSPF external type 2,i - IS-IS, L1 - IS-IS level-1,L2 - IS-IS level-2, * -candidate defaultU - per-user static route, o - ODRGateway of last resort is not set172.16.0.0/24 is subnetted, 2 subnetsC 172.16.1.0 is directly connected,Serial1C 172.16.2.0 is directly connected,Serial0I 10.0.0.0/8 [100/8576] via 172.16.1.1,00:00:09, Serial1[100/8576] via 172.16.2.1, 00:00:19,Serial0The 100 in bold is the administrativedistance for IGRP.A partial list of administrative distances is included below:Protocol ADEIGRP 90IGRP 100OSPF 110RIP 120BGP 180If a router hears a IP RIP and a IGRP update for the same network the router will discard the rip information. IP RIP uses h op count as it’s metric, while IGRP uses a composite metric including bandwidth and load, speed is the primary consideration.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes placeAnswerb) multiple stations listen for traffic and transmit at the same timeCollisions is a term that is used in an ethernet environment. Ethernet can be described as a listen then transmit scenario. First a station will listen for traffic if no traffic is sensed then a transmission will take place. If two stations transmit at the same time collisions will occur. The first station to detect the collision sends out a jamming signal to alert all stations a collision has occurred. At this point these stations set up a random interval timer when the timer expires re-transmission will occur.Token ring is a token passing process a station can transmit only when he has the token. There never can be multiple tokens on the ring. Early token release allows up to two data frames to be transmitted on a token ring LAN at the same time. Collisions do not occur on a token ring.Because of the point to point nature of serial links collisions do not occur.Beaconing is a term used in a token passing environment.12. [RINx] How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252?a) 32b) 30c) 60d) 62e) 4Answerd) 62The above mask is using 6 bits to describe subnets. The formula used to determine the number of subnets (not including the all 0’s or all 1’s subnet) is 2n - 2 were n is the number of subnet bits. This is the number to use when configuring a ip address with the setup dialog.13. [RxNx] What commands will list all protocols that are currently being routed? (Choose all that apply.)a) show ip protocolb) show protocolc) show rund) show starte) All of the aboveAnswerb) show protocolc) show runShow ip protocol will show just the ip routing protocols that are currently configured. Show start may or may not show the current routed protocols.Below is the output of show protocolRouter_B#show protocolGlobal values:Internet Protocol routing is enabledAppletalk routing is enabledBRI0 is administratively down, line protocol is downBRI0:1 is administratively down, line protocol is downBRI0:2 is administratively down, line protocol is downSerial0 is administratively down, line protocol is downSerial1 is administratively down, line protocol is downSerial2 is administratively down, line protocol is downSerial3 is administratively down, line protocol is downTokenRing0 is administratively down, line protocol is down14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.Answere) All of the above.Every access list has an implicit deny all at the end. What would the need be to create a access list with just deny statements. Access-list are processed from the top downtherefore the order of each statement could be critical, for instance suppose you createdan access list and the first line was a permit any and the next line was a deny. Sinceit’s top down processing a packet would be permitted to pass on the first line and the second line would never be executed. An extended list will give you a "match count" thatwill help in determining what the most efficient order should be.15. [xxNx] If the access-group command is configured on an interface and there is noaccess-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.Answerd) The command will be executed and permit all traffic in and out.There are two steps to use an access list .1. Create the list2. Place the access list on a interfaceThe analogy I use in class is:Suppose you reside in a gated community. The community is not protected until you hire the guard and then place him at the gate. If you hire the guard and never place him at the gateall traffic will be permitted.When there is no access list on an interface it is implicit permit anyWhen an access list is placed on a interface it is implicit deny any16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network onlyAnswerc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkThe secret to this question is the key word "established." Established means that thepacket will be permitted unless it is the first part of the three way handshake. Recallthat when we initiate a TCP connection we have no ACK. How can we acknowledge a sequence number from the other side when we have not established a session with him?17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.Answera) Standard lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.A standard list will only check the source address. It makes no difference where the packet is going. If you place a standard list close to the source you could very well be denying that traffic to go to other destinations. An extended list can be placed close to the source because we can permit or deny traffic based upon the source and destination address. This insures that only traffic we wish to have denied is denied.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.Answeri) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.Answerd) The packet will "die" when it reaches the terminator.20—39及答案20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active: a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the Active monitor.22. [FxNx] BECN and FECN are:a) Used to provide keepalives in a Frame Relay environmentb) Used to provide error checking in a Frame Relay environmentc) Used to provide congestion information in a Frame Relay environmentd) Used to provide flow control parameters in a Frame Relay environmente) BECN and FECN are not used in a Frame Relay environment.23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Chooseall that apply.)a) Allows the use of a more robust addressing scheme.b) Allows for a larger scalable networkc) Reduces convergence timed) Allows "supernetting"e) All of the above.24. [OxNx] Which of the following are reasons for the OSI model?a) Standardizes interfacesb) Allows modular engineeringc) Facilitates learning and teachingd) All of the above.25. [RxNx] Which of the following is NOT a ROUTING protocol:a) OSPFb) RIPc) IPXd) EIGRPe) NLSP26. [RxNx] Which statement is NOT true about link state protocols:a) Link state advertisements are sent to all routers in an area.b) Each router executes the SPF algorithm.c) Link state routers keep a topological database of the network.d) Link state routers include the originating router s routing table.e) Link state routers know of possible alternate paths to a particular network.27. [RxNx] Which of the following would NOT appear in a routing table?a) Next hop addressb) Interface Port referencesc) MAC addressd) Network addresse) Metrics28. [OxNx] Which statement is true of the Datalink OSI layer ?a) 802.3 is the MAC sub layer.b) No such thingc) MAC sublayer provides the connection to the network layer.d) MAC sublayer uses SAPS to access the network layer.e) SAP sublayer uses the MAC layer to access the LAN medium.29. [RINx] Given the IP address of 193.243.12.43 and a subnet mask of 255.255.255.128, what is the subnet address?a) 194.243.12.32b) 193.243.0.0c) 194.243.12.43d) 193.243.12.128e) None of the above.30. [CxNx] Cisco uses a naming convention to identify frame types. Which four of the following mappings are correct?Cisco_name = Common_namea) cisco_II = Ethernet_IIb) arpa = Ethernet_IIc) sap = Ethernet_802.3d) sap = Ethernet_802.2 LLCe) Novell Ether = Ethernet_802.2 LLCf) cisco_802 = Ethernet_802.2 LLCg) snap = Token Ring Snaph) snap = Ethernet_SNAP31. [RxNx] In order to communicate throughout an internetwork, which of the following are required. Choose Two.a) The use of a routable protocol such as NetBEUI or LATb) A hierarchical naming scheme server such as DNSc) A host file at each communicating deviced) A two part network addressing scheme such as Network/Hoste) The use of a routable protocol such as IP or IPXf) The use of a routable protocol such as TCP or IPX32. [CxNx] What is the default route on an IP network? Choose one.a) This is the route that will be chosen first by IP for delivery of a datagram.b) The address of the nearest downstream neighbor in a Token ring network.c) At the router, it is the route used to direct frames for which the next hop has not been explicitly listed in the routing table.d) Any static route listing in a routing table.e) When all conditions are equal, the best route for delivery of IP datagrams.33. [CxNx] A caret symbol (^) inserted into a failed command indicates which of the following. Choose one.a) Numeric data is required for this command.b) The point in a command where you can simply press return to complete the syntax string.c) The point in a command where you have entered an incorrect command, keyword or argument.d) The point in a command where you must enter a required value.e) This is a normal indicator for any failed command.34. [RXNx] The metric used by IPX RIP is:a) hopsb) ticksc) costd) ticks and hopse) None of the above.35. [xINx] Which one of the following masks has the nickname of the "serial mask"?a) 255.255.255.192b) 255.255.255.224c) 255.255.255.240d) 255.255.255.248e) 255.255.255.252。

ccna考试题及答案

ccna考试题及答案

ccna考试题及答案1. 以下哪项是网络层的功能?A. 路由选择B. 错误检测C. 流量控制D. 封装数据包答案:A2. 在OSI模型中,哪一层负责在网络中传输数据?A. 应用层B. 传输层C. 会话层D. 网络层答案:D3. 以下哪个协议是用于在IP网络中发现网络设备的?A. ARPB. RARPC. ICMPD. OSPF答案:A4. 在TCP/IP模型中,哪一层与OSI模型的传输层相对应?A. 应用层B. 互联网层C. 网络接口层D. 传输层答案:D5. 以下哪个地址是一个有效的IPv4地址?A. 192.168.1.256B. 192.168.1.1C. 10.0.0.0D. 172.16.300.1答案:B6. 在配置路由器时,以下哪个命令用于进入全局配置模式?A. enableB. configure terminalC. privileged execD. user exec答案:B7. 以下哪个命令用于在Cisco设备上显示当前配置?A. show running-configB. show startup-configC. show configD. show current-config答案:A8. 在Cisco设备上,以下哪个命令用于保存当前的配置到启动配置文件?A. copy running-config startup-configB. copy startup-config running-configC. save running-configD. save startup-config答案:A9. 以下哪个命令用于在Cisco设备上查看所有接口的状态?A. show interfacesB. show ip interface briefC. show interface statusD. show running-config interface答案:B10. 在Cisco设备上,以下哪个命令用于关闭接口?A. shutdownB. no shutdownC. disableD. no enable答案:A11. 以下哪个命令用于在Cisco设备上启用接口?A. shutdownB. no shutdownC. disableD. no enable答案:B12. 在配置静态路由时,以下哪个命令用于指定下一跳地址?B. ip static-routeC. route ipD. static-route ip答案:A13. 以下哪个命令用于在Cisco设备上清除ARP表?A. clear arp-cacheB. clear arpC. clear arp tableD. clear ip arp答案:D14. 在配置动态路由协议时,以下哪个命令用于在接口上启用RIP?A. ip rip enableB. ip rip receiveD. network rip答案:C15. 以下哪个命令用于在Cisco设备上查看RIP路由表?A. show ip ripB. show ip route ripC. show ripD. show ip protocols答案:B16. 在配置EIGRP时,以下哪个命令用于指定自动汇总?A. metric weightsB. auto-summaryC. network auto-summaryD. no auto-summary答案:B17. 以下哪个命令用于在Cisco设备上查看EIGRP邻居?A. show ip eigrp neighborsB. show eigrp neighborsC. show ip eigrpD. show eigrp interfaces答案:A18. 在配置OSPF时,以下哪个命令用于指定路由器ID?A. router-idB. router ospfC. networkD. area答案:A19. 以下哪个命令用于在Cisco设备上查看OSPF路由表?A. show ip ospfB. show ip ospf databaseC. show ospfD. show ip route ospf答案:D20. 在配置VLAN时,以下哪个命令用于创建一个新的VLAN?A. vlan databaseB. configure terminalC. vlan [vlan-id]D. new-vlan答案:C21. 以下哪个命令用于将接口分配给VLAN?A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案:C22. 在配置交换机时,以下哪个命令用于将接口设置为Trunk 模式?A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案:B23. 以下哪个命令用于在Cisco设备上查看VLAN配置?A. show vlanB. show vlan briefC. show vlan detailD. show vlan all答案:B24. 在配置VTP时,以下哪个命令用于将交换机设置为VTP服务器模式?A. vtp mode serverB. vtp mode clientC. vtp mode transparentD. vtp mode off答案:A25. 以下哪个命令用于在Cisco设备上查看VTP状态?A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案:A26. 在配置STP时,以下哪个命令用于设置根桥?A. spanning-tree root primaryB. spanning-tree root secondaryC. spanning-tree root primary [priority]D. spanning-tree root secondary [priority]答案:C27. 以下哪个命令用于在Cisco设备上查看STP状态?A. show spanning-treeB. show spanning-tree detailC. show spanning-tree summaryD. show spanning-tree interface答案:A28. 在配置VLAN Trunking Protocol (VTP) 时,以下哪个命令用于设置VTP域名?A. vtp domain [domain-name]B. vtp password [password]C. vtp mode [mode]D. vtp version [version]答案:A29. 以下哪个命令用于在Cisco设备上查看当前的VTP版本?A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案:A30. 在配置端口安全时,以下哪个命令用于限制接口上可以学习到的最大MAC地址数量?A. switchport port-security maximum [mac-count]B. port-security maximum [mac-count]C. switchport port-security violation restrictD. port-security violation shutdown答案:A这些题目和答案仅供学习和参考之用,实际的CCNA考试内容和形式可能会有所不同。

CCNA考试题库中英文翻译版及标准答案

CCNA考试题库中英文翻译版及标准答案

CCNA考试题库中英文翻译版及答案————————————————————————————————作者:————————————————————————————————日期:CCNA考试题库中英文翻译版及答案1[1]1. What are two reasons that a network administrator would use access lists? (Choose two.)1.出于哪两种理由,网络管理员会使用访问列表?A. to control vty access into a routerA.控制通过VTY访问路由器B. to control broadcast traffic through a routerB.控制广播流量穿越路由器2.一个默认的帧中继WAN被分类为哪种物理网络类型?A. point-to-pointA.点到点B. broadcast multi-accessB.广播多路访问C. nonbroadcast multi-accessC.非广播多路访问D. nonbroadcast multipointD.非广播多点E. broadcast point-to-multipointE.广播点到多点Answer: C3. A single 802.11g access point has been configured and installed in the center of a squarA few wireless users are experiencing slow performance and drops while most users are oat peak efficiency. What are three likely causes of this problem? (Choose three.)3.一个802.11接入点被部署在一个方形办公室的中央,当大多数用户在大流量传输数一些无线用户发现无线网络变得缓慢和出现丢包A. mismatched TKIP encryptionB. null SSIDC. cordless phonesD. mismatched SSIDE. metal file cabinetsF. antenna type or directionAnswer: CEF4. Refer to the exhibit. How many broadcast domains exist in the exhibited topology?根据下图,图中的拓扑中存在多少个广播域?A. one A.1B. two B.2C. three C.3D. four D.4E. five E.5F. six F.6Answer: C5. Refer to the exhibit. What two facts can be determined from the WLAN diagram? (Choose two.)5.根据下图,WLAN diagram决定了哪两个事实A. The area of overlap of the two cells represents a basic service set (BSS).A. 两个 cells的overlap的区域描述了一个basic service setB. The network diagram represents an extended service set (ESS).B. 网络描述了一个extended service setC. Access points in each cell must be configured to use channel 1.C. 再每个CELL中的AP必须被配置成使用channel 1D. The area of overlap must be less than 10% of the area to ensure connectivity.D. 为了确保连通性,重叠区域必须小于10%E. The two APs should be configured to operate on different channels.E. 两个访问点应该被配置成工作在不同的频道Answer: BE6. The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router.Which of the following statements is true concerning this command?6.路由器上输入命令frame-relay map ip 10.121.16.8 102 broadcast,以下选项正确的是?A. This command should be executed from the global configuration mode.A.该命令应该在全局配置模式下被执行B. The IP address 10.121.16.8 is the local router port used to forward data.B.IP地址10.121.16.8是本地路由器用来转发数据的接口C. 102 is the remote DLCI that will receive the information.C.102是远端的DLCI它将接受信息。

CCNA中英文试题两套-推荐下载

CCNA中英文试题两套-推荐下载

14 下列哪两项陈述说明了无线网络安全的特征? (选择两项。)
4
请参见图示。 在 Linksys 集成路由器的 Wireless 菜单选项中,Network Mode 选项 Mixed 是什么意思?
路由器支持加密和身份验证。 路由器支持有线和无线两种连接。 路由器支持 802.11b、802.11g 和 802.11n 设备。 路由器支持通过红外和无线电射频连接。
5 接入点可以使用哪两种身份验证方法? (选择两项。)
WEP WPA EAP ASCII 预共享密钥
6 哪项接入点功能允许网络管理员定义可以进入无线网络的数据类型?
加密 黑客攻击拦截 通信过滤 MAC 地址过滤 身份验证
对全部高中资料试卷电气设备,在安装过程中以及安装结束后进行高中资料试卷调整试验;通电检查所有设备高中资料电试力卷保相护互装作置用调与试相技互术通关,1系电过,力管根保线据护敷生高设产中技工资术艺料0不高试仅中卷可资配以料置解试技决卷术吊要是顶求指层,机配对组置电在不气进规设行范备继高进电中行保资空护料载高试与中卷带资问负料题荷试2下卷2,高总而中体且资配可料置保试时障卷,各调需类控要管试在路验最习;大题对限到设度位备内。进来在行确管调保路整机敷使组设其高过在中程正资1常料中工试,况卷要下安加与全强过,看度并22工且22作尽22下可22都能22可地护以缩1关正小于常故管工障路作高高;中中对资资于料料继试试电卷卷保破连护坏接进范管行围口整,处核或理对者高定对中值某资,些料审异试核常卷与高弯校中扁对资度图料固纸试定,卷盒编工位写况置复进.杂行保设自护备动层与处防装理腐置,跨高尤接中其地资要线料避弯试免曲卷错半调误径试高标方中高案资等,料,编试要5写、卷求重电保技要气护术设设装交备备置底4高调、动。中试电作管资高气,线料中课并敷3试资件且、设卷料中拒管技试试调绝路术验卷试动敷中方技作设包案术,技含以来术线及避槽系免、统不管启必架动要等方高多案中项;资方对料式整试,套卷为启突解动然决过停高程机中中。语高因文中此电资,气料电课试力件卷高中电中管气资壁设料薄备试、进卷接行保口调护不试装严工置等作调问并试题且技,进术合行,理过要利关求用运电管行力线高保敷中护设资装技料置术试做。卷到线技准缆术确敷指灵设导活原。。则对对:于于在调差分试动线过保盒程护处中装,高置当中高不资中同料资电试料压卷试回技卷路术调交问试叉题技时,术,作是应为指采调发用试电金人机属员一隔,变板需压进要器行在组隔事在开前发处掌生理握内;图部同纸故一资障线料时槽、,内设需,备要强制进电造行回厂外路家部须出电同具源时高高切中中断资资习料料题试试电卷卷源试切,验除线报从缆告而敷与采设相用完关高毕技中,术资要资料进料试行,卷检并主查且要和了保检解护测现装处场置理设。备高中资料试卷布置情况与有关高中资料试卷电气系统接线等情况,然后根据规范与规程规定,制定设备调试高中资料试卷方案。

ccna 考试题目

ccna 考试题目

CCNA认证试题一(附答案和解析)1、目前,我国应用最为广泛的LAN标准是基于()的以太网标准. (A) IEEE 802.1 (B) IEEE 802.2 (C) IEEE 802.3 (D) IEEE 802.5 答案:C参考知识点:现有标准:IEEE 802.1 局域网协议高层 IEEE 802.2 逻辑链路控制 IEEE 802.3 以太网 IEEE 802.4 令牌总线 IEEE 802.5 令牌环 IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准,如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑,但目前的快速以太网(100BASE-T、1000BASE-T标准)为了最大程度的减少冲突,最大程度的提高网络速度和使用效率,使用交换机(Switch)来进行网络连接和组织,这样,以太网的拓扑结构就成了星型,但在逻辑上,以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法。

电气电子工程师协会或IEEE (Institute of Electrical and Electronics Engineers)是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志,学报,书籍和每年组织300多次专业会议IEEE定义的标准在工业界有极大的影响。

下面列出:IEEE802.3以太网标准 802.3--------- 10Base以太网标准802.3u-------- 100Base-T(快速以太网)802.3z-------- 1000Base-X(光纤吉比特以太网) 802.3ab-------- 1000Base-T(双绞线吉比特以太网)2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: () (A) 这是一个广播地址 (B) 这是一个网络地址 (C) 这是一个私有地址 (D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上 (F) 这是一个公有地址答案:CE注:IP地址中关键是看她的主机位,将子网掩码划为二进制,1对应上面的地址是网络位,0对应的地址是主机位 192.168.19.255/20划为二进制为:11000000.10101000.00010011.11111111 11111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址: 10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时,下列哪些项没有发生变化(假定没有使用地址转换技术)?() (A) 源端口号 (B) 目的端口号 (C) 源网络地址 (D) 目的网络地址 (E) 源MAC地址 (F) 目的MAC地址答案:ABCD参考知识点:路由功能就是指选择一条从源网络到目的网络的路径,并进行数据包的转发。

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CCNA(200-301)题库V1.0(2020.11.23)Exam AQUESTION 1A network engineer must create a diagram of a multivendor network.which command must be configured on the Cisco devices so that the topology of the network can be mapped?网络工程师必须创建一个多供应商网络图。

必须在Cisco设备上配置哪个命令才能映射网络拓扑?A. Device(config)#lldp runB. Device(config)#cdp runC. Device(config)# cdp enableD. Device(config)# flow-sampler-map topologyCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 2Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks?启用时,思科无线局域网控制器上的哪个功能会限制来自特定网络的管理访问?A. CPU ACLB. TACACSC. Flex ACLD. RADIUSCorrect Answer: A Section:choice E xplanationExplanation/Reference:Reference:https:///c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.htmlQUESTION 3When a site-to-site VPN is used, which protocol is responsible for the transport of user data?使用站点到站点VPN时,哪个协议负责用户数据的传输?A. IKEv2B. IKEv1C. IPsecD. MD5Correct Answer: C Section:choice E xplanationExplanation/Reference:QUESTION 4How do TCP and UDP differ in the way that they establish a connection between two endpoints?TCP和UDP在两个端点之间建立连接的方式有何不同?A. TCP use the three-way handshake,and UDP dose no guarantee message deliveryA. TCP使用三向握手,而UDP不保证消息传递B. TCP use synchronization packets,and UDP uses acknowledgement packetsC. UDP provides reliable message transfer,and TCP is a connectionless protocol.D. UDP use SYN,SYN ACK,and FIN bits in the frame header while TCP uses SYN,SYN ACK,and ACK bis.Correct Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 5What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two) 导致延迟冲突在以太网接口上增加的两个原因是什么?(选择两个)A. when the sending device waits 15 seconds before sending the frame againB. when the cable length limits are exceeded超出电缆长度限制时C. when one side of the connection is configured for half-duplexD. when Carner Sense Multiple Access/Collision Detection is used使用Carner Sense多路访问/冲突检测时E. when a collision occurs after the 32nd byte of a frame has been transmittedCorrect Answer: BDSection: choiceExplanationExplanation/Reference:QUESTION 6A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone? 思科IP电话从连接的PC接收未标记的数据流量。

电话采取什么行动?A. It allows the traffic to pass through unchanged它允许流量不变地通过B. It drops the trafficC. It tags the traffic with the default VLAND. It tags the traffic with the native VLANCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 7Refer to the exhibit. The show ip ospf interface command has been executed on R1 How is OSPF configured? 请参见图示。

在R1上已执行show ip ospf interface命令。

如何配置OSPF?A. The interface is not participating in OSPFB. A point-to-point network type is configuredC. The default Hello and Dead timers are in use使用默认的Hello和Dead计时器D. There are six OSPF neighbors on this interfaceCorrect Answer: C Section:choice E xplanationExplanation/Reference:QUESTION 8What benefit does controller-based networking provide versus traditional networking?与传统网络相比,基于控制器的网络有什么好处?A. provides an added layer of security to protect from DDoS attacksB. combines control and data plane functionality on a single device to minimize latencyC. moves from a two-tier to a three-tier network architecture to provide maximum redundancyD. allows configuration and monitoring of the network from one centralized point允许从一个集中点配置和监视网络Correct Answer: D Section:choice E xplanationExplanation/Reference:QUESTION 9When a floating static route is configured, which action ensures that the backup route is used when the primary route fails? 配置浮动静态路由后,当主路由发生故障时,可以采取哪些措施确保使用备用路由?A. The floating static route must have a higher administrative distance than the primary route so it is used as a backup浮动静态路由必须具有比主路由更高的管理距离,因此可以用作备用路由B. The administrative distance must be higher on the primary route so that the backup route becomes secondary.C. The floating static route must have a lower administrative distance than the primary route so it is used as a backupD. The default-information originate command must be configured for the route to be installed into the routing tableCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 10Which mode must be used to configure EtherChannel between two switches without using a negotiation protocol?在不使用协商协议的情况下,必须使用哪种模式在两个交换机之间配置EtherChannel?A. onB. autoC. activeD. desirablCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 11What are two descriptions of three-tier network topologies? (Choose two.)三层网络拓扑的两个描述是什么?(选择两个。

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