advanced computer network lecture 1: introduction yunming ye department of computer science shenzhen...
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Advanced Computer Network
Lecture 1: Introduction
Yunming Ye
Department of Computer Science
Shenzhen Graduate School
Harbin Institute of Technology
Text for This Course
Computer Networks Fourth Edition
By Andrew S. Tanenbaum Prentice Hall, 4th edition, Published August 2002, 891 pages, ISBN 0130661023
Other Recommended Books
1. W.Richard Stevens. ( 译者 : 范建华等 ). 《 TCP/IP 详解 卷 1: 协议 》 机械工业出版社, 2000 年。
2. Behrouz A.Forouzan , Sophia Chung Fegan.( 译者 : 谢希仁 ) ,《 TCP/IP 协议族》 , 清华大学出版社 ,2001 年。
3. 谢希仁,《计算机网络(第 4 版)》,电子工业出版社,2003 年。
Course Coverage
• Introduction
• The Data Link Layer
• The Medium Access Layer
• The Network Layer and Network Design
• The Transport Layer
• Application Protocols in TCP/IP
• Network Security Protocols
• Advanced Computer Network Applications
– P2P Computing
– Grid Computing
– Cloud Computing
Class Format and Requirements
Pre-requisites : data structure and algorithms, a good working knowledge of C++ OR Java (for the implementation project).
Class & Project Development
Final grade will be determined as follows::
–20% home work & class presentations–50% exams –30% project
Uses of Computer Networks
• Business Applications
• Home Applications
• Mobile Users
• Social Issues
Home Network Applications
• Access to remote information
• Person-to-person communication
• Interactive entertainment
• Electronic commerce
IP: 202.120.2.101MAC: 00-10-D3-06-6C-B1
IP: 202.120.30.8MAC: 00-10-D3-06-A0-81
IP: 202.120.2.254MAC: 00-AB-B1-D5-9B-11
IP: 202.120.6.8MAC: 00-AB-B1-D5-9B-12
IP: 202.120.6.100MAC: 00-AB-C2-01-A0-20
Hub
Laptop
Host A
IP: 202.120.25.200MAC: 00-AB-C2-01-A0-21
IP: 202.120.25.100MAC: 00-AB-D3-62-86-30
IP: 202.120.30.200MAC: 00-AB-D3-62-86-31
Router 1
Router 2
Router 3
Host B
line 1
line 2
line 3
line 4
Inside the Network Communication
Network Hardware
• Local Area Networks
• Metropolitan Area Networks
• Wide Area Networks
• Wireless Networks
• Home Networks
• Internetworks
Wireless Networks
Categories of wireless networks:
• System interconnection
• Wireless LANs
• Wireless WANs
Home Network Categories
• Computers (desktop PC, PDA, shared peripherals• Entertainment (TV, DVD, VCR, camera, stereo,
MP3)• Telecomm (telephone, cell phone, intercom, fax)• Appliances (microwave, fridge, clock, furnace,
airco)• Telemetry (utility meter, burglar alarm, babycam).• Things of Internet: RFID Technology!
Network Software
• Protocol Hierarchies• Design Issues for the Layers• Connection-Oriented and Connectionless Services• Service Primitives• The Relationship of Services to Protocols
Service Primitives (2)
Packets sent in a simple client-server interaction on a connection-oriented network.
Reference Models
• The OSI Reference Model
• The TCP/IP Reference Model
• A Comparison of OSI and TCP/IP
• A Critique of the OSI Model and Protocols
• A Critique of the TCP/IP Reference Model
Comparing OSI and TCP/IP Models
Concepts central to the OSI model
• Services
• Interfaces
• Protocols
A Critique of the OSI Model and Protocols
Why OSI did not take over the world
• Bad timing
• Bad technology
• Bad implementations
• Bad politics
A Critique of the TCP/IP Reference Model
Problems:• Service, interface, and protocol not distinguished• Not a general model• Host-to-network “layer” not really a layer• No mention of physical and data link layers• Minor protocols deeply entrenched, hard to replace
Example Networks
• The Internet– RFC Documents: http://www.ietf.org/rfc.html
• Connection-Oriented Networks: X.25, Frame Relay, and ATM
• Ethernet
• Wireless LANs: 802:11
The ARPANET
(a) Structure of the telephone system.(b) Baran’s proposed distributed switching system.
The ARPANET (3)
Growth of the ARPANET (a) December 1969. (b) July 1970.(c) March 1971. (d) April 1972. (e) September 1972.
Internet Usage
Traditional applications (1970 – 1990)
• News
• Remote login
• File transfer
Network Standardization
• Who’s Who in the Telecommunications World– International Telecommunication Union
• Who’s Who in the International Standards World– International Standards Organization
• Who’s Who in the Internet Standards World– Internet Engineering Task Force
RFC (Request for Comments) documents
ITU
• Main sectors• Radiocommunications• Telecommunications Standardization• Development
• Classes of Members• National governments• Sector members• Associate members• Regulatory agencies