【正文】 inevitable trend in the development of the puters. So, in universities Computer work courses are also being more and more important. But the study also pared the puter work is relatively abstract. Computer work simulation software, there can be a very good point to make up for this. With working simulation tools， students can construct， tune， and analyze work performance while reinforcing their understanding of working theory. Network simulation tools save money by offering the user a tool to enhance the design and integration of works. This paper contains two parts ：a puter work simulation teaching system implemented by COMNET III， and lab system teaching video.COMNET III is a performance analysis tool for munications works. It is used to model works， their control algorithms， and workload. COMNET III then simulates the operation of the work and provides measures of work performance. The COMNET III object’s parameters are easily adjusted to match the realworld object. Students can use COMNET III to model and simulate LANs， WANs， and interconnections of various works (inters). Network simulations add a practical flavor to the course and enable students to observe the operation of an inter prising dissimilar works and protocols.Used ScreenFllash，COMNET III lab system teaching video provides a particular and intuitionist way for student to plete all labs. The video records every detail of the all of five labs， building models， setting parameters. And there are particular descriptions in each pivotal step.【Key words】puter work working simulator COMNET III teaching video重慶郵電大學(xué)本科畢業(yè)設(shè)計(jì)（論文）II目 錄前 言 ....................................................................................................................1第一章 網(wǎng)絡(luò)仿真概述 ........................................................................................2第一節(jié) 計(jì)算機(jī)網(wǎng)絡(luò)仿真軟件在教學(xué)領(lǐng)域 .....................................................2一、網(wǎng)絡(luò)仿真軟件的發(fā)展及比較 ................................................................2三、網(wǎng)絡(luò)仿真軟件在教學(xué)領(lǐng)域的應(yīng)用 ........................................................4四、網(wǎng)絡(luò)仿真軟件在教學(xué)領(lǐng)域?qū)嵺`中的注意問(wèn)題 ....................................4第二節(jié) 本人主要工作 ......................................................................................5第二章 背景知識(shí)簡(jiǎn)介 ........................................................................................6第一節(jié) 計(jì)算機(jī)網(wǎng)絡(luò)基礎(chǔ)知識(shí)概要 ..................................................................6第二節(jié) 網(wǎng)絡(luò)設(shè)計(jì)的步驟和原則 ......................................................................7一、網(wǎng)絡(luò)設(shè)計(jì)的基本步驟 ............................................................................7二、網(wǎng)絡(luò)設(shè)計(jì)的原則 ....................................................................................7第三節(jié) COMNET III 仿真軟件的認(rèn)識(shí)及應(yīng)用 ................................................8第四節(jié) COMNET III 主要網(wǎng)絡(luò)元素含義及參數(shù)說(shuō)明 ..................................10一、網(wǎng)絡(luò)元素含義和設(shè)定 ..........................................................................10三、網(wǎng)絡(luò)仿真模型建模過(guò)程 ......................................................................15第五節(jié) 本章小結(jié) ............................................................................................15第三章 COMNET III 實(shí)驗(yàn)系統(tǒng)設(shè)計(jì) .................................................................16第一節(jié) 實(shí)際問(wèn)題分析 ....................................................................................16第二節(jié) 總體設(shè)計(jì) ............................................................................................16第三節(jié) 詳細(xì)設(shè)計(jì) ............................................................................................17一、實(shí)驗(yàn)一 COMNET III 仿真軟件的認(rèn)識(shí)及使用 ...............................17二、實(shí)驗(yàn)二 LAN 網(wǎng)絡(luò)建模仿真及性能報(bào)告分析 .................................20三、實(shí)驗(yàn)三　 廣域網(wǎng) ..................................................................................24四、實(shí)驗(yàn)四　 網(wǎng)絡(luò)綜合實(shí)驗(yàn) ......................................................................26五、開(kāi)放實(shí)驗(yàn)內(nèi)容 ......................................................................................31第四節(jié) 本章小結(jié) ...........................................................................................35第四章 實(shí)驗(yàn)系統(tǒng)教學(xué)視頻軟件制作 ..............................................................36第一節(jié) 錄制工具簡(jiǎn)要說(shuō)明 ...........................................................................36重慶郵電大學(xué)本科畢業(yè)設(shè)計(jì)（論文）III第二節(jié) 教學(xué)視頻軟件制作過(guò)程 ...................................................................36第三節(jié) 本章小結(jié) ...........................................................................................38結(jié) 論 ..............................................................................................................39致 謝 ..............................................................................................................40參考文獻(xiàn) ..............................................................................................................41附 錄 ..............................................................................................................42一、英文原文: .................................................................................................42二、英文翻譯: .................................................................................................50重慶郵電大學(xué)本科畢業(yè)設(shè)計(jì)（論文）0前 言隨著以網(wǎng)絡(luò)為核心的信息時(shí)代的到來(lái)，計(jì)算機(jī)網(wǎng)絡(luò)課程是現(xiàn)代信息類都需要接觸的一門課程。COMNET III網(wǎng)絡(luò)仿真工具，他創(chuàng)造了被稱作“搭積木的方法”通過(guò)利用圖形用戶界面接口GUI（由在真實(shí)網(wǎng)絡(luò)中的實(shí)體抽象出的許多“模塊”或?qū)ο蠼M成） ，使用者能夠改變，定義，這些模塊的屬性或使用默認(rèn)屬性，參數(shù)，來(lái)更好的模擬實(shí)體的功能。COMNET III 提供了一個(gè)完整，視圖的環(huán)境來(lái)對(duì)計(jì)算機(jī)網(wǎng)絡(luò)建模和性能分析。本論文主要介紹的是使用 COMNET III 軟件搭建的計(jì)算機(jī)網(wǎng)絡(luò)仿真實(shí)驗(yàn)系統(tǒng)，及制作其教學(xué)視頻。第二個(gè)實(shí)驗(yàn)是搭建簡(jiǎn)單的局域網(wǎng)，并初步使用報(bào)告分析網(wǎng)絡(luò)。第四個(gè)實(shí)驗(yàn)是給出現(xiàn)實(shí)中題目，讓學(xué)生搭建有層次結(jié)構(gòu)的網(wǎng)絡(luò)。第五個(gè)實(shí)驗(yàn)是給出要求搭建模型， 幫助學(xué)生想象計(jì)算機(jī)網(wǎng)絡(luò)中的概念是怎樣運(yùn)用到現(xiàn)實(shí)世界中。計(jì)算機(jī)仿真技術(shù)在教學(xué)中的應(yīng)用改變了以往實(shí)驗(yàn)教學(xué)的被動(dòng)性，學(xué)生通過(guò)自身與計(jì)算機(jī)仿真環(huán)境的相互作用來(lái)獲得知識(shí)和技能，充分挖掘?qū)嶒?yàn)的潛能，引入計(jì)算機(jī)仿真技術(shù)可以優(yōu)化實(shí)踐過(guò)程，改善實(shí)踐教學(xué)的環(huán)境。網(wǎng)絡(luò)仿真的預(yù)測(cè)功能是其他任何方法都無(wú)法比擬的；（2）使用范圍廣，既可以用于現(xiàn)有網(wǎng)絡(luò)的優(yōu)化和擴(kuò)容，也可以用于新網(wǎng)絡(luò)的設(shè)計(jì)，而且特別適用于大中型網(wǎng)絡(luò)的設(shè)計(jì)和優(yōu)化；（3）初期應(yīng)用成本不高，而且建好的網(wǎng)絡(luò)模型可以延續(xù)使用，后期投資還會(huì)不斷下降 [1]。在國(guó)外，網(wǎng)絡(luò)仿真技術(shù)的研究和應(yīng)用已經(jīng)有十多年的歷史。我國(guó)的網(wǎng)絡(luò)仿真技術(shù)的研究 1999 年剛剛起步，這主要有兩個(gè)原因，一個(gè)是我國(guó)數(shù)據(jù)網(wǎng)絡(luò)的發(fā)展較晚，對(duì)網(wǎng)絡(luò)仿真技術(shù)的需求相對(duì)不是十分迫切；另一個(gè)原因是主流的網(wǎng)絡(luò)仿真軟件基本上產(chǎn)自美國(guó)，高端產(chǎn)品在 1998 年以前一直是對(duì)包括中國(guó)在內(nèi)的社會(huì)主義國(guó)家禁運(yùn)。重慶郵電