Computer Networks. Feng Lin School of Computer Science Sichuan University

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1 Feng Lin School of Computer Science Sichuan University

2 Preface Instructor: Feng Lin TA:Yuanchi Yan Yuchong Liu Website:

3 Course Description This course provides an introduction to fundamental concepts in the design and implementation of computer communication networks, their protocols, and applications, with emphasis on the Internet. Topics to be covered include: overview of network architectures, applications, network programming, transport, congestion, routing, and data link protocols, addressing, local area networks, and some advanced topics. Course Website: QQ Group for problems in class:

4 Why we need to study computer networks Fundamental of many cool technologies: cloud computing, mobile computing, pervasive computing, IOT, VNET Mobile Internet + Big Data means: Higher work efficiency More jobs (for cser at least) Better user experience A new Revolution?

5 Concepts for Networks Communication Networks Telecommunication Networks Our course only covers the computer networks!!

6 Course Purpose To learn the principles of computer networking Protocol layers and their service models multiplexing/demultiplexing reliable data transfer flow control and congestion control routing (path selection) error detection, correction sharing a broadcast channel: multiple access link layer addressing

7 Course Purpose To learn Internet architecture and protocols To learn to use Internet protocols Programs using TCP sockets to communicate across an IP network Programs that act as clients using common Internet protocols like FTP, HTTP, and SMTP

8 Course Purpose To learn the principles of distributed system design To learn to build distributed applications using the most important current technical approaches Distributed objects to be managed by an object request broker (ORB) Distributed applications based on existing and new distributed objects managed by an ORB

9 Course Purpose To know the modern developments to the dynamic field of computer networking To understand not only today s networks but tomorrow s as well To do something you want to do on computer networking

10 Course Features Top-Down Approach End system application End to end transport Network core: routing Hooking nets together Link level protocols Ethernet router local ISP company network server workstation mobile regional ISP

11 Course Features Internet as Case Study Now computer network is a synonym( 同义词 ) of Internet (User s view) Eager to learn it Application protocol and socket programming Instantiation and implementation in the Internet

12 Course Features Emphasize on Principle - The network foundational problems and solutions (see preface x) Practical Skills Introduction to real network devices; Operating on routers; Network diagnostic tools; Network application programming New Technologies

13 Course Outline Computer Network Basic Network Distributed Computing Basic Selected Topics Lab Practice Project 4 lecture hours * 12weeks = 48 lecture hours 4 practice hours * 4 times = 16 practice hours

14 Course Outline Computer Network Basic and Internet Application Layer Transport Layer Network Layer & Routing Link Layer and LAN (Local Area Network) Physical Layer

15 Course Outline Network Distributed Computing Basic (if possible) Distributed System Principles Mid-Level Distributed Computing Object Request Brokers and Services

16 Course Outline Selected Topics Multimedia Networking Security in Network Management Wireless Networks WSN

17 Course Outline Lab Practice Network devices Hub Switch Router

18 Course Outline Lab Practice Network diagnostic tools Netstat ping/traceroute Nslookup Sniffer (Ethereal)

19 Course Outline Lab Practice Hands-on Ethereal Lab To use Ethereal to get and check network packet To use Ethereal to check HTTP and DNS To use Ethereal to check TCP To use Ethereal to check IP To use Ethereal to check IEEE and DHCP

20 Course Outline Lab Practice Network Application Programming A multi-threaded web server A mail user agent UDP pinger Proxy cache Web server and browser TCP chat server Reliable transport protocol Measuring throughput RMI distributed agenda service CORBA distributed To-Do List

21 Course Outline Project Network Application Programming Socket API : BSD socket -- UNIX Microsoft Winsock -- Windows Sun Java socket -- Windows Client-server application Getting time from server Chatting Coding and documentation Demo

22 Grading Policy Assignments: 20% Some questions from textbook Projects:10% Network Application Programming Lab: 10% One lab for five marks Midterm Exam 10% Final Examination: 50% ( The 18 th Week) Closed-book test

23 Text Book & References Text Book James F. Kurose and Keith W. Ross. Computer Networking: A Top- Down Approach Featuring the Internet. Fourth edition, Boston: Addison Wesley,. ISBN:

24 Text Book & References References: Douglas E. Comer, Internetworking with TCP/IP Volume One (6th Edition) ISBN- 10: X Michael J. Donahoo and Kenneth L. Calvert TCP/IP Sockets in C, Second Edition: Practical Guide for Programmers (Morgan Kaufmann Practical Guides) 2nd Edition ISBN- 10: Kevin R. Fall & W. Richard Stevens TCP/IP Illustrated (vol.1-vol.3)

25 Text Book & References References in chinese: Andrew S. Tanenbaum Davi J. Wetheral 计算机网络 ( 第五版 ), 清华大学出版社谢钧谢希仁计算机网络教程 ( 第 4 版 ), 人民邮电出版社尹圣雨, 图灵程序设计丛书 :TCP/IP 网络编程, 人民邮电出版社

26 Text Book & References To learn more about computer networks(out of this course): 斯托林斯 (William Stallings), 数据与计算机通信 ( 第 9 版 ), 电子工业出版社刘志华刘亚川, 现代通信技术导论, 北京邮电大学出版社米沙施瓦茨 (Mischa Schwartz), 移动通信, 电子工业出版社

27 This Course s Challenge Giant numbers of new nomenclatures and concepts Various of network structures/topologies A lot of protocols which defined a great deal of working mechanism A mass of references It is nodoubt that you will fail with this course without hard working!!!

28 Tips for Learning During learning, We should think networks as below: hardware: N={V,E} Vertex: router, switch, bridge, hub, end-host. Edge: transition medias: wired (copper, fiber...), wirless.

29 software: protocols defined how data will be transmitted in networks. layered mode operations on source->forwarder- >destination format of data unit.

Computer Networks. Dr. Abdel Ilah ALshbatat Dept. of Communication and Computer Engineering Faculty of Engineering Tafila Technical University

Computer Networks. Dr. Abdel Ilah ALshbatat Dept. of Communication and Computer Engineering Faculty of Engineering Tafila Technical University Computer Networks Dr. Abdel Ilah ALshbatat Dept. of Communication and Computer Engineering Faculty of Engineering Tafila Technical University 1 Lecture 0 Course Information Title: Computer Networks 2 Course