全国自考网络工程复习笔记04749

全国自考网络工程复习笔记04749
全国自考网络工程复习笔记04749

自考网络工程串讲笔记(04749)

第一章概述

1.2 计算机网络介绍

1.2.1 计算机网络定义

1、计算机网络是:(1)计算机技术与通信技术相结合的产物

(2)由自主计算机互连起来的集合体

(3)将地理位置不同的具有独立功能的多台计算机及其外部设备,通过通信线路连接起来,在网络操作系统、网络管理软件及网络通信协议的管理

和协调下,实现资源共享和信息传递的计算机系统(目的)。

2、计算机网络包括硬件和软件:

硬件:通信设备为主机转发数据,接口设备是网络和计算机之间的接口。

主机(端系统):个人计算机、大型计算机、客户机(client)或工作站(workstation)、服务器(sever)

通信设备(中间系统):交换机和路由器

接口设备:网卡、调制解调器

传输介质:双绞线、同轴电缆、光钎、无线电和卫星链路。

软件:通信协议和应用软件

通信协议(计算机之间的信息传输规则):TCP/IP等

应用软件(网络上的各种应用):WWW、E-mail、FTP等

1.2.2 计算机网络拓扑结构

1、广域网拓扑结构:

广域网是将多个子网或多个局域网互接起来的网络。集线器、中继器、交换机将多个设备连接起来形成局域网拓扑结构。

广域网特点:点到点、存储转发、工作在底层

(1)网状拓扑结构

优点:

①系统可靠性高,比较容易扩展

②可以改善通信路径上的信息流量分配

③可以在多条路径中选择最佳路径,以减小传输延迟

④网络可组建成各种形状,采用多种通信信道,多种传输速率,适合广域网复杂的

网络环境

缺点:

①线路和结点成本高

②结构复杂,难于管理和维护,每一结点都与多点进行连接,必须采用路由算法和

流量控制方法

(2)环形拓扑结构

采用光纤做主干线。

可靠性好,不存在单点失效问题,可以灵活地建立各种链路备份策略

2、局部网络拓扑结构

1

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课程介绍 一、课程性质 英语(二)是高等教育自学考试各专业(英语专业除外)本科阶段的公共基础课。 三、本资料介绍 针对英语(二)试题中第一题到第四题,本资料给出对应的解题技巧及真题举例;第五题和第六题主要涉及到英语语法,本资料将近5 年真题涉及到的语法知识进行总结,详细解释并举对应的真题为例;针对第七题作文部分,本资料给出写作模板及参考例文。 如果您能认真阅读本资料并掌握其中的解题技巧和语法知识,那么您一定能顺利通过考试!

目录 第一部分语法知识 (4) 第一单元名词形容词副词介词 (4) 第一章名词 (4) 第二章形容词 (5) 第三章副词 (8) 第四章介词 (10) 第二单元谓语动词 (11) 第一章系动词 (12) 第二章情态动词 (12) 第三章时态 (13) 第四章英语语态 (16) 第三单元非谓语动词 (17) 第一章动词不定式 (18) 第二章分词 (19) 第四单元从句 (21) 第一章名词性从句 (21) 第二章形容词从句(定语从句) (21) 第三章副词从句(状语从句) (21) 第五单元并列结构 (22) 第二部分应对技巧 (24) 第一章阅读判断 (24) 第二章阅读选择 (28) 第三章概括段落大意和补全句子 (33) 第四章填句补文 (36) 第五章填词补文 (38) 第六章完形补文 (40) 第七章短文写作 (41)

一、概念 第一部分语法知识 第一单元名词形容词副词介词 第一章名词 名词表示人、事物、地点或抽象概念的名称。 如:person,phone,China,time 二、用法 1.名词作主语和宾语。 ●Knowledge is power. (知识就是力量。) ●I love English. (我喜欢英语。) 2.名词可以作定语修饰名词 ①作定语的名词往往是说明其中名词的材料、用途、时间、地点、内容、类别等 ②被修饰的名词变复数时,一般情况下,作定语用的名词不需要变为复数形式。 ● a diamond ring(一枚钻戒) ●orange juice(橙汁) ●English lessons(英语课) 3.名词分为可数名词和不可数名词,可数名词出现时,要么是复数名词,要么前面加限定词,如冠词(a、an 或 the),不可数名词永远是单数形式。 ●He has a girlfriend.(他有一个女朋友。) ●He has two girlfriends.(他有两个女朋友。) ●I want some bread.(我想要一些面包。) 三、考点 1.名词作宾语 They were given 33 on memory and thinking. (2014.10) 【答案】:B 【解析】:原文“They were given 33 on memory and thinking.”可知此处应填写名词,作宾语,后文中谈到“tests”,可知 B 选项符合文意。 2.名词修饰名词 For language _ (learner), these forms of communication enable them to share i d e a s about themselves and the world in almost real time. (2015.4)

2018年10月自考04749网络工程试题及答案含评分标准

2018年10月高等教育自学考试全国统一命题考试 网络工程试卷 (课程代码04749) 本试卷共6页,满分l00分,考试时间l50分钟。 考生答题注意事项: 1。本卷所有试题必须在答题卡上作答。答在试卷上无效,试卷空白处和背面均可作草稿纸。2.第一部分为选择题。必须对应试卷上的题号使用2B铅笔将“答题卡”的相应代码涂黑。3.第二部分为非选择题。必须注明大、小题号,使用0.5毫米黑色字迹签字笔作答。 4. 合理安排答题空间,超出答题区域无效。 第一部分选择题 一、单项选择题:本大题共20小题,每小题2分,共40分。在每小题列出的备选项中只 有一项是最符合题目要求的,请将其选出。 1.TCP/IP网络模型共分为4层,由下至上分别是 A.网络接口层、网际层、传输层和应用层 B.网络接口层、传输层、网际层和应用层 C.应用层、传输层、网际层和网络接口层 D.物理层、数据链路层、网络层和传输层 2.下列仅工作在物理层的网络设备是 A.路由器 B.集线器 C.网桥 D.以太网交换机 3.El的传输速率是 A.8kbi6s B。64kbit/s C.2.048Mbit/s D.1 55;Mbit/s 4. 下列不属于GSM系统的网元是 A.基站控制器(BSC) B.移动交换中心(MSC) C.网关GSN(GGSN) D.基站子系统(BSS) 5.在www.test.com.cn的域名解析过程中,首先访问的域名服务器是 A.根域名服务器 B..cn域名服务器 C.本地域名服务器 D..test.com.cn域名服务器 6.SDH帧的时间长度是 A.12.5μs B.32μs C.64μs D.125μs 7.以太网的媒体访问控制技术是 A.CSMA/CA B.CSMA/CD C.HDLC D.PPP 8.下列有关VLAN交换视链路的叙述,错误的是 A.混合链路仅可承载标记数据 B.中继链路常用来连接两个VLAN交换机 C.接入链路将普通以太网设备接入VLAN交换机 D.中继链路和混合链路必须支持IEEE 802.1Q协议 9.PPP中负责设备之间链路创建、维护和终止的是 A.CHAP B.LCP C.NCP D.PAP 10.ADSL下行数据业务将镉双绞线160kHz~1.1MHz频段划分的子信道数是 A.32 B.64 C.128 D.256 11.下列有关路由技术的叙述,错误的是 A.动态路由能实时的适应网络结构的变化 B.静态路由不能对网络变化做出自主反映

自考英语二复习资料

? UNIT 1 ? 重点单词和短语 ? objective accomplish predict accompany attain scheme skilled argue define ? interview prospect ? course of action in the way(by the way, in no way, in a way) make a guess at contribute to and the like (and so on) ? seek to do sth. in part point of view vary from…to … ! ? apply for (to) ? have no idea bring about take the trouble to do ? put oneself in one’s place ? to one’s advantage at a disadvantage ask for in hand turn down (up, on, off, out, over, back) ? 重点、难点句子详解 ? decision is a choice made from among alternative courses of action that are available. ? 解析:courses of action 意思是行动方案、做事步骤;made 是过去分词;from among — 为二重介词 ? 例:We ’ll inform you as soon as tickets become _____. (06-4) ? A. valuable B. capable C. acceptable D. available (D) ? 2. … some suggest that the management process is decision making. ? 解析:suggest 表示认为、提出、暗示意思,后面不用虚拟语气,表示建议意思, 后面用虚拟语气。 ? 例:It is suggested that the meeting (should) be held (hold)at some other time. 、 ? 3. … decision making includes limiting alternatives as well as identifying them. ? 解析:as well as 意思是既…又… ? 4. In fact, I did have several questions, but you have already answered them all. ? 解析:助动词do 在肯定句中用在动词之前表示强调,意思是确实。 ? 5. … but do not let it worry you too much. ? 解析:动词let, make, have, hear, see, observe 等词之后的宾语补足语为省略to 的 不定式结构。 ? 6. There is little likelihood that … ! ? 对比:There is a/ every/no likelihood that/of ? 例:The two sisters are ___ in many ways, not only in appearance but also in temperament.(06-4) ? A. like B. likely C. alike D. lively (C) ? ? UNIT2 ? 重点单词和短语 : ? exert collapse shrink basis launch convince operate revolve glitter unlikely (be likely to) whereas concerned (be concerned about) plateau ? in theory apply to depend on research into swallow up make use of together with in every respect in other words consist of a great many under the circumstances make a difference above all as a rule ? seek to do sth. in part point of view vary from…to … ? 例:I hope my boy friend will be handsome, strong and ___ kind. (06-4) — ? A. above all B. in all C. at all D. after all (A) ? 重点、难点句子详解 ? 1. Einstein claimed that matter and energy are interchangeable… ? 例:爱因斯坦声称物质和能量是可以相互转化的,因此没有绝对的时间和空间。 (05-4-68) ? 2. It is only recently that astronomers have begun specific research into black holes. ? 例1:It is on Friday ___ we will hold the meeting. . ? A. that B. when C. in that time D. what (A) ? 例2: As a painter, Ted was very ___ about the colors he used. (03-10) ? A. specific B. special C. peculiar D. particular (D) ? 3. The earth is one of mine planets which move in orbit round the sun. ? 对比:The earth is the only one of the nine planets which has life on it. ? 4. The total water area is about three times as large as the land area. ? 解析:数词+times + as +形容词+as 是表示倍数的表达法。 ? 例:It is important to note that a reading of 4 indicates an earthquake ten times as strong -

2012年01月自考网络工程试题真题

全国2012年1月高等教育自学考试 网络工程试题 课程代码:04749 一、单项选择题(本大题共20小题,每小题2分,共40分) 在每小题列出的四个备选项中只有一个是符合题目要求的,请将其代码填写在题后的括号内。错选、多选或未选均无分。 1.以下IP地址中,不属于 ...私有地址的是( ) A.10.0.0.1 B.10.10.10.2 C.172.168.0.4 D.192.168.10.3 2.用于传输SNMP协议消息的是( ) A.TCP B.UDP C.ICMP D.ARP 3.下列TCP/IP协议中,不属于 ...应用层协议的是( ) A.OSPF B.SNMP C.TFTP D.FTP 4.在TCP/TP协议中,进行路由选择的层次是( ) A.网络层 B.数据链路层 C.传输层 D.应用层 5.链路控制协议(LCP)结构中包含4个域,分别是CODE、IDENTIFIER、LENGTH和DATA,其中IDENTIFIER域长度是( ) A.8位 B.16位 C.32位 D.64位 6.TCP/IP参考模型中的网络接口层(Network Access)对应了OSI参考模型中的( ) A.网络层 B.数据链路层和物理层 C.数据链路层 D.物理层 7.1000Base-T以太网的最大网段距离为( ) A.100米 B.200米 C.500米 D.1000米 8.在ADSL上网中,使用的链路层协议是( ) A.PPP B.PPPoE 网络工程试卷第1 页共5 页

C.DCF D.PCF 9.E1/T1数字中继中,T1的传输速率是( ) A.64Kbit/s B.640Kbit/s C.1.544Mbit/s D.2.084Mbit/s 10.GPRS中,不同于 ...全球移动通信系统网元是( ) A.BTS B.BSC C.SGSN D.GGSN 11.以太网属于( ) A.点到点网络 B.广播网络 C.非广播网络 D.NBMA网络 12.下列属于无线局域网的标准是( ) A.802.4a B.802.5b C.802.9a D.802.11a 13.以明文方式传输用户名和口令的是( ) A.PAP B.CHAP https://www.360docs.net/doc/c94869521.html,P D.MD5 14.路由毒化是指当一条路由信息变为无效后,路由器不会立即将它从路由表中删除,为了立即清除相邻路由器间的环路,只要将其度量值改为( ) A.8 B.10 C.15 D.16 15.IGP传播路由的协议是在( ) A.区域内 B.局域网内 C.区域间 D.自治系统 16.路由信息所不包括 ...的内容是( ) A.源地址 B.下一跳 C.路由权值 D.目标网络 17.以下路由表项目中,要由网络管理员手动配置的是( ) A.静态路由 B.动态路由 C.直接路由 D.管理距离 网络工程试卷第2 页共5 页

自考英语二复习资料

? UNIT 1 ?重点单词和短语 ? objective accomplish predict accompany attain scheme skilled argue define ? interview prospect ? course of action in the way(by the way, in no way, in a way) make a guess at contribute to and the like (and so on) ? seek to do sth. in part point of view vary from…to … ? apply for (to) ? have no idea bring about take the trouble to do ?put oneself in one’s place ?to one’s advantage at a disadvantage ask for in hand turn down (up, on, off, out, over, back) ?重点、难点句子详解 ? 1.A decision is a choice made from among alternative courses of action that are available. ?分析:courses of action意思是行动方案、做事步骤;made 是过去分词;from among 为二重介词 ?例:We’ll inform you as soon as tickets become _____. (06-4) ? A. valuable B. capable C. acceptable D. available (D) ?2. … some suggest that the management process is decision making. ?分析:suggest表示认为、提出、暗示意思,后面不用虚拟语气,表示建议意思, 后面用虚拟语气。 ?例:It is suggested that the meeting (should) be held (hold)at some other time. ?3. … decision m aking includes limiting alternatives as well as identifying them. ?分析:as well as意思是既…又… ? 4. In fact, I did have several questions, but you have already answered them all. ?分析:助动词do在肯定句中用在动词之前表示强调,意思是 确实。 ?5. … but do not let it worry you too much. ?分析:动词let, make, have, hear, see, observe等词之后的 宾语补足语为省略to 的 不定式结构。 ?6. There is little likelihood that … ?对比:There is a/ every/no likelihood that/of ?例:The two sisters are ___ in many ways, not only in appearance but also in temperament.(06-4) ? A. like B. likely C. alike D. lively (C) ? ? UNIT2 ?重点单词和短语? exert collapse shrink basis launch convince operate revolve glitter unlikely (be likely to) whereas concerned (be concerned about) plateau ? in theory apply to depend on research into swallow up make use of together with in every respect in other words consist of a great many under the circumstances make a difference above all as a rule ? seek to do sth. in part point of view vary from…to … ?例:I hope my boy friend will be handsome, strong and ___ kind. (06-4) ? A. above all B. in all C. at all D. after all (A) ?重点、难点句子详解 ? 1. Einstein claimed that matter and energy are interchangeable… ?例:爱因斯坦声称物质和能量是可以相互转化的,因此没有绝 对的时间和空间。 (05-4-68) ? 2. It is only recently that astronomers have begun specific research into black holes. ?例1:It is on Friday ___ we will hold the meeting. ? A. that B. when C. in that time D. what (A) ?例2: As a painter, Ted was very ___ about the colors he used. (03-10) ? A. specific B. special C. peculiar D. particular (D) ? 3. The earth is one of mine planets which move in orbit round the sun. ?对比:The earth is the only one of the nine planets which has life on it. ? 4. The total water area is about three times as large as the land area. ?分析:数词+times + as +形容词+as是表示倍数的表达法。?例:It is important to note that a reading of 4 indicates an earthquake ten times as strong as one with a reading of 3. (unit 6 text B) ? 5. The more we learn about other people, the better we understand their ideas, and, as a rule, the better we like those people themselves. ?分析:the+比较级,the+比较级结构,意思是越…越…,第一 个从句中谓语动词不 用倒装,第二个从句谓语动词可以用倒装,也可以用正装语气。?例:___ we are, ___ we become. ? A. the oldest; the wiser B. older; wiser ? C. the older, the more wise D. the older; the wiser (D) ? UNIT 3 ?重点单词和短语 ? deteriorate debate (on/upon) request ensure oppose(be opposed to) burden sensitive privilege appoint bias

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