《计算机网络》课程授课教案（双语，计算机科学与技术专业）

Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.0306 Period 5-7 Textbook COMPUTER NETWORK波10计算机科学与技术本科 Content Chapter1计算机网络和因特网 3 Objectives 了解Iniemet的定义，熟悉Protoco的概念：掌握网络连接服务方式。 Key points Connectionless and Connection-Oriented Services Poinso Conor self sudy Some good hyperlinks.hp/wso Teaching equipment Multimedia Relaed knowedge Intemet Teaching methods 启发式、讨论式教学 Outlines requirements and time allocation Prefac 20分钟 What is unique about this textbook? Pedagogical features,Chapter dependencies (介绍本教材内容安排与特点，对学生的学习要求等。讲解法教学) Computer Networks and the Intemet(计算机网络和因特网) l.I What is the Intemet?(什么是因特网) 20分钟 I1 1 A Nuts and Bolts Description Basic hard ware and software components.Service todistributed applications 1.12 Connection-oriented service and connectionless service. Some good Hyperlinks http//www.ietforg http://www.w3.org http://www.data.com (讲解Internet的软硬件构成，因特网提供的服务类型：提供与因特网有关的知识网 站，供学生浏览自学：用讨论式教学方式教学。) 1.13 What is a Protocol(什么是协议) A Human Analogy 10分钟 “what's the time? “I have a question” introductions 10分钟 and actions taken on msg transmission,receipt

1 Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.03.06 Period 5-7 Textbook COMPUTER NETWORK Specialty and Stratification 10 计算机科学与技术 本科 Content Chapter 1 计算机网络和因特网 Teaching hours 3 Objectives 了解 Internet 的定义，熟悉 Protocol 的概念；掌握网络连接服务方式。 Key points Connectionless and Connection-Oriented Services Points difficult to understand Connectionless and Connection-Oriented Services Content for self study Some good hyperlinks, http://www.ietf.org http://www.isoc.org Teaching equipment Multimedia Related knowledge Internet Teaching methods 启发式、讨论式教学 Outlines, requirements and time allocation Preface What is unique about this textbook? Pedagogical features, Chapter dependencies （介绍本教材内容安排与特点，对学生的学习要求等。讲解法教学） 1 Computer Networks and the Internet（计算机网络和因特网） 1.1 What is the Internet?（什么是因特网） 1.1.1 A Nuts and Bolts Description Basic hardware and software components. Service to distributed applications. 1.1.2 A Service Description Connection-oriented service and connectionless service. Some good Hyperlinks http://www.ietf.org http://www.w3.org http://www.data.com （讲解 Internet 的软硬件构成，因特网提供的服务类型；提供与因特网有关的知识网 站，供学生浏览自学；用讨论式教学方式教学。） 1.1.3 What is a Protocol（什么是协议） A Human Analogy “what’s the time?” “I have a question” introductions Network Protocols Protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt 20 分钟 20 分钟 10 分钟 10 分钟

Outlines requirements and time allocation (通过人类用语言交流信息的情况，重点讨论网络交换信息必须采用的各种协议，用 讨论式教学方式教学。) 12 The network Edge(网络边缘) 1.2.1 End System,Clients,and Servers 20分钟 Millions of connected computing devices:hosts,end-systems pe's workstations,servers PDA's phones,toasters running network apps 10分钟 Communication links fiber copper,ado,satellite routers:forward packets(chunks)of data thru network 1.2.2 Connectionless and Connection-Oriented Services 20分钟 Connection-oriented service Goal:data transfer between end sys. Handshaking:stup (prepare for)head ofme TCP-Transmission Control Protoco Internet's connection-oriented service 10分钟 Connectionless service Goal:data transfer between end systems UDP-User Datagram Protocol [RFC 768]:Intemet's connectionless service unreliable datatransfer no flow control no congestion control 20分钟 App's using TCP HTIP (WWW).FTP (file transfer),Telnet (remote login).SMTP (email) App's using UDP: treaming media,teleconferencing.Intemet telephony (重点讲解网络提供的两种连接服务，用讨论式教学方式教学。) 复习本次课的主要内容。 10分钟

2 Outlines, requirements and time allocation （通过人类用语言交流信息的情况，重点讨论网络交换信息必须采用的各种协议，用 讨论式教学方式教学。） 1.2 The network Edge（网络边缘） 1.2.1 End System, Clients, and Servers Millions of connected computing devices: hosts, end-systems pc’s workstations, servers PDA’s phones, toasters running network apps Communication links fiber, copper, radio, satellite routers: forward packets (chunks) of data thru network 1.2.2 Connectionless and Connection-Oriented Services Connection-oriented service Goal: data transfer between end sys. Handshaking: setup (prepare for) data transfer ahead of time TCP - Transmission Control Protocol Internet’s connection-oriented service Connectionless service Goal: data transfer between end systems UDP - User Datagram Protocol [RFC 768]: Internet’s connectionless service unreliable data transfer no flow control no congestion control App’s using TCP: HTTP (WWW), FTP (file transfer), Telnet (remote login), SMTP (email) App’s using UDP: streaming media, teleconferencing, Internet telephony （重点讲解网络提供的两种连接服务，用讨论式教学方式教学。） 复习本次课的主要内容。 20 分钟 10 分钟 20 分钟 10 分钟 20 分钟 10 分钟

Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.03.08 Period 3-4 Textbook COMPUTER NETWORK 10计算机科学与技术本科 Content Chapter1计算机网络和因特网 Teaching Objectives 了解网络接入方式，网络传输介质：熟DydLs的概念：熟主干网概念 掌握网络数据交换方式。 Key points Packet switching.circuit switching Poin Delay and Loss in packet-switched networks Content for self study Some reference hyperlinks,http://www.cisco.com/ivered/ec/td/do/ Teaching equipment Multimedia Related knowledge Intemet Teaching methods 启发式、讨论式教学 Outlines.requirements and time allocation 复习上次课的重要内容 5分钟 I3 The Network Core(网络核心) 1.3.1 Circuit Switching.Packet Switching.and Message Switching 10分钟 The fundamental question:how is data transferred through net? r call:telephone ne “"chunks" 1.32 Routing in Data Network 10分钟 Goal:move packets among routers from source to destination datagram network: destination address deteines next hop roues may change analogy:driving.asking directions virtual circuit network: 10分钟 each packet camies tag (virtual circuit ID),tag determines next hop fixed path determined at call setup time.remains fixed thru call (重点详解数报 与线路交换方式对比讲解)》 I.4 Access Network and Physical Media(接入网和物理媒体》 1.4.1 Access Network residential access nets institutional access networks (school,company)10 mobile access networks

3 Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.03.08 Period 3-4 Textbook COMPUTER NETWORK Specialty and Stratification 10 计算机科学与技术 本科 Content Chapter 1 计算机网络和因特网 Teaching hours 2 Objectives 了解网络接入方式，网络传输介质；熟悉 Delay and Loss 的概念；熟悉主干网概念； 掌握网络数据交换方式。 Key points Packet switching, circuit switching Points difficult to understand Delay and Loss in packet-switched networks Content for self study Some reference hyperlinks, http://www.cisco.com/univercd/cc/td/doc/ Teaching equipment Multimedia Related knowledge Internet Teaching methods 启发式、讨论式教学 Outlines, requirements and time allocation 复习上次课的重要内容 1.3 The Network Core（网络核心） 1.3.1 Circuit Switching, Packet Switching, and Message Switching The fundamental question: how is data transferred through net? Circuit switching: dedicated circuit per call: telephone net Packet-switching: data sent thru net in discrete “chunks” 1.3.2 Routing in Data Network Goal: move packets among routers from source to destination datagram network: destination address determines next hop routes may change during session analogy: driving, asking directions virtual circuit network: each packet carries tag (virtual circuit ID), tag determines next hop fixed path determined at call setup time, remains fixed thru call routers maintain per-call state （重点讲解数据报交换方式的特点，与线路交换方式对比讲解） 1.4 Access Network and Physical Media（接入网和物理媒体） 1.4.1 Access Network residential access nets institutional access networks (school, company) mobile access networks 5 分钟 10 分钟 10 分钟 10 分钟 10 分钟

Outlines requirements and time allocation 1.4.2 Physical Media Protocols 10分钟 Physical Media physical link:transmitted data bit propagates across link guided media:signals propagate in solid media:copper,fiber unguided media:signals propagate freelye.g.,radio Twisted Pair (TP).Coaxial cable,fiber.radio (通过当前家庭及单位接入因特网情况，讲解网络接入方式，网络传输介质，用讨论 式教学方式教学。) 1.5 Intemet Bachbones,NAPs,and ISPs(ISP和因特网主干) 10分钟 Roughly hierarchical National/intemational backbone providers (NBPs) Local ISP.company:connect into regional ISPs (了解网络主干网也是分层次结构的，用讨论式教学方式教学。) .6 Delay and Loss in Packet-.Switched Network(分组交换网络中的时延和分组丢失) 1.6.1 Types of Delay Delay in packet-switched networks 10分钟 Nodal Processing delay: check bit errors determine output link Transmission delay: R=link bandwidth(bps) 10分钟 L=packet length(bits) time to send bits into link =L/R s=propagation speed in medium(~2x108 m/sec) propagation delay=d/s Queuing delay: R=link bandwidth(bps) 10分钟 L=packet length (bits) a=average packet arrival rate traffic intensity=La/R La/R~0:average queuing delay small La/R->1:delays become large La/R>1:more"work"arriving than can be serviced,average delay 重点讲解Queuing delay,用启发、讨论式教学方式教学，) 复习本次课的主要内容。 5分钟

4 Outlines, requirements and time allocation 1.4.2 Physical Media Protocols Physical Media physical link: transmitted data bit propagates across link guided media: signals propagate in solid media: copper, fiber unguided media: signals propagate freelye.g., radio Twisted Pair (TP), Coaxial cable, fiber, radio （通过当前家庭及单位接入因特网情况，讲解网络接入方式，网络传输介质，用讨论 式教学方式教学。） 1.5 Internet Bachbones, NAPs, and ISPs（ISP 和因特网主干） Roughly hierarchical National/international backbone providers (NBPs) interconnect (peer) with each other privately, or at public Network Access Point (NAPs) Regional ISPs：connect into NBPs Local ISP, company：connect into regional ISPs （了解网络主干网也是分层次结构的，用讨论式教学方式教学。） 1.6 Delay and Loss in Packet-Switched Network（分组交换网络中的时延和分组丢失） 1.6.1 Types of Delay Delay in packet-switched networks Nodal Processing delay: check bit errors determine output link Transmission delay: R=link bandwidth (bps) L=packet length (bits) time to send bits into link = L/R Propagation delay: d = length of physical link s = propagation speed in medium (~2x108 m/sec) propagation delay = d/s Queuing delay: R=link bandwidth (bps) L=packet length (bits) a=average packet arrival rate traffic intensity = La/R La/R ~ 0: average queuing delay small La/R -> 1: delays become large La/R > 1: more “work” arriving than can be serviced, average delay infinite! （重点讲解 Queuing delay，用启发、讨论式教学方式教学。） 复习本次课的主要内容。 10 分钟 10 分钟 10 分钟 10 分钟 10 分钟 5 分钟

Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.03.13 Period 5-7 Textbook COMPUTER NETWORK被10计算机科学与技术本科 Content Chapter1计算机网络和因特网 3 Objectives 掌握网络层次和服务模型。了解计算机网络、Interet的发展历史 Key points Protocol Layers and Their Service Models Poinso Layers and Their Service Models Confor sfstudy Some good hyperlinks http:wwis.com/niverd/ Teaching equipment Multimedia Related knowedge Intemet Teaching methods 启发式、讨论式教学 Outlines requirements and time allocation 5分钟 复习上次课的重要内容 L.7 Protocol Layers and Their Service Models(协议层次和它们的服务模型)》 10分钟 7.1 Layered Architecture Networks are complex! many“pieces” hosts 1.72 The Interet Protocol Stack 20分钟 application:supporting network applications host stdata ransfer network:routing of datagrams from source to destination link:data transfer between neighboring network elements physical:bits“on the wire

5 Teaching Plan Name Zhang Yu-fei Academic Year 2013-2013 Term 2 Date 2013.03.13 Period 5-7 Textbook COMPUTER NETWORK Specialty and Stratification 10 计算机科学与技术 本科 Content Chapter 1 计算机网络和因特网 Teaching hours 3 Objectives 掌握网络层次和服务模型。了解计算机网络、Internet 的发展历史 Key points Protocol Layers and Their Service Models Points difficult to understand Protocol Layers and Their Service Models Content for self study Some good hyperlinks, http://www.cisco.com/univercd/cc/td/doc/ Teaching equipment Multimedia Related knowledge Internet Teaching methods 启发式、讨论式教学 Outlines, requirements and time allocation 复习上次课的重要内容 1.7 Protocol Layers and Their Service Mod els（协议层次和它们的服务模型） 1.7.1 Layered Architecture Networks are complex! many “pieces”: hosts, routers, links of various media, applications, protocols, hardware, software 1.7.2 The Internet Protocol Stack application: supporting network applications transport: host-host data transfer network: routing of datagrams from source to destination link: data transfer between neighboring network elements physical: bits “on the wire” 5 分钟 10 分钟 20 分钟