现代计算机网络 - 计算机科学技术系

现代计算机网络 - 计算机科学技术系

计算机网络华东师范大学计算机系 张卫2012-3-22 1

现代计算机网络 - 计算机科学技术系

教学安排主要参考书：Andrew S. Tanenbaum, Computer Networks (Fourth Edition) 基本要求：独立完成书中的习题 鼓励提问，保持课堂安静

期末闭卷考试

2012-3-22

现代计算机网络 - 计算机科学技术系

1. IntroductionThe Definition of Computer NetworkResource Sharing Connection Independent computer

Sharable Resource : Hardware/Software/Conmunication Line/Information The Way to Sharing Different from distribute system Connection: Media/Distance/Architecture/Protocol2012-3-22 3

现代计算机网络 - 计算机科学技术系

2. The Physical LayerDefines the mechanical, electrical, and timing interface Transmission media Examples of communication systems

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现代计算机网络 - 计算机科学技术系

2.1 The Theoretical Basis for Data Communication

Fourier Analysis Bandwidth-Limited Signals Maximum Data Rate of a Channel

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现代计算机网络 - 计算机科学技术系

Chapter 3The Data Link LayerObject : reliable, efficient communication between two adjacent machines.

现代计算机网络 - 计算机科学技术系

3.1 Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control

现代计算机网络 - 计算机科学技术系

Chapter 4The Medium Access Control Sublayer

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现代计算机网络 - 计算机科学技术系

4.1 The Channel Allocation ProblemSharing Broadcasting Medium Multiplexing Static Channel Allocation Dynamic Channel Allocation

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现代计算机网络 - 计算机科学技术系

Chapter 5The Network LayerGoal: end-to-end transmission

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现代计算机网络 - 计算机科学技术系

5.1 Network Layer Design IsuesStore-and-Forward Packet Switching Services Provided to the Transport Layer Implementation of Connectionless Service Implementation of Connection-Oriented Service Comparison of Virtual-Circuit and Datagram Subnets

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现代计算机网络 - 计算机科学技术系

Chapter 6The Transport LayerHeart of the whole protocol hierarchy. Providing reliable, cost-effective data transport from the source to the destination12:45:09 12

现代计算机网络 - 计算机科学技术系

6.1 The Transport ServiceServices Provided to the Upper LayersConnection-oriented and connectionless Subnet vs Host

Transport Service PrimitivesA standard set of primitives and work on a wide variety of networks

Berkeley Sockets An Example of Socket Programming:An Internet File Server12:45:09 13

现代计算机网络 - 计算机科学技术系

Chapter 7The Application Layer

现代计算机网络 - 计算机科学技术系

7.1 DNS – The Domain Name SystemMap ASCII strings onto network addressesThe reasons for using DNS The size of the file would become too large. Host name conflicts would occur constantly The load and latency. A hierarchical Domain-based naming scheme A distributed database system

The DNS Name Space Resource Records Name Servers15

现代计算机网络 - 计算机科学技术系

Chapter 8Network Security