Download Part I: Introduction - Computer Science

CNT 4704
Computer Communication
Networking
(not “analysis”)
Cliff Zou
School of Electrical Engineering
and Computer Science
University of Central Florida
Fall 2009
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About my self
 Office: HEC 335
 Tel: 407-823-5015
[email protected]
 Office hour: Tuesday/Thursday 3pm – 5pm
 Course webpage: http://www.cs.ucf.edu/~czou/CNT4704
 UCF Tegrity for online lecture video streaming
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http://tegrity.ucf.edu/listallcourses/listing.aspx
Each lecture will be posted several hours after a class
 Use Webcourse@UCF for homework assignment
and grading
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Keeping grade private
Easy homework submission
Having a simple BBS channel
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What is this course about?
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Very few, very basic “analysis” (don’t be scared by
the course’s official name)
Introductory course in “computer networking”
Focus on Internet architecture/protocols
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TCP/IP, 2 networking programming projects
Several lab assignments (fun, real)
Email (spam), Web. Ethernet, hub, wireless LAN
One chapter on Internet security introduction
Goals:
 Learn a lot (facts, principles and practice)
 Have fun (Use/apply/understand real world
network immediately)
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Student evaluation of this course
 Fall 2005 (11):
 Excellent-55%, Very good-18.2%
 Good-18.2%, Fair-9.1%, Poor-0%
 Fall 2006 (6):
 Excellent-76.7%, Very good-21.7%
 Good-0%, Fair-1.7%, Poor-0%
 Fall 2007 (12):
 Excellent-41.7%, Very good-25%
 Good-25%, Fair-0%, Poor-8.33%
 Fall 2008 (5): started to use Tegrity
 Excellent-80%, Very good-20%
 Good-0%, Fair-0%, Poor-0%
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Course information
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Prerequisites:
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Basic knowledge on Algorithms and Operating Systems
C or C++ programming skills
Basic usage of Linux
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Olympus account + my lab Linux for networking programming
Course materials:
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Text: Computer Networking: A Top Down
Approach Featuring the Internet, J.
Kurose & K. Ross, Addison Wesley, 5th ed.,
2009
Textbook online resource (see first page)
Class notes
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Course information (more)
 Workload:
Coursework
written homework
programming (C,C++)
lab assignments (Ethereal)
midterm exam
final exam
approx amount
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2-3
2
1
1
approx %
20%
24%
10%
20%
26%
The final grade will use +/- policy, i.e., you may get A, A-, B+,
B, B- … grade.
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Course information (even more)
 In-class style: interaction, questions
 Real network programming (fun)
 Hands on experience: packet trace, email spam
 Flexible:
 Teaching difficulty/speed/contents based on your feedback
 So please tell me freely your thinking and interests!
 Academic honesty
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A top-down approach:
We’ll cover networking
top-down
 End-system applications,
end-end transport
 Network core: routing,
hooking nets together
local ISP
regional ISP
 Link-level protocols, e.g.,
Ethernet
 Other interesting stuff:
 Security
 wireless
company network
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Course Overview:
Part 1: Introduction (text: Chapter 1)
 What is the Internet?
Application
Web, Email, VOIP
Application
Transport
TCP, UDP
Transport
Network
IP
Network
Data Link
Ethernet, cellular
Data Link
Physical link
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Course Overview:
Part 2: Application Layer (text: Ch. 2)
 Principles of application-layer protocols
 World Wide Web: HTTP
 File transfer: FTP
 Electronic mail: Email
 The Internet's directory service: DNS
 VOIP (Voice Over IP)
 Socket programming
PROGRAMMING ASSIGNMENT 1
If possible, have another networking program
--- a simple web proxy
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Course Overview:
Part 3: Transport Layer (text Ch. 3)
 Transport-layer services and principles
 Multiplexing and demultiplexing applications
 Connectionless transport: UDP
 Principles of reliable of data transfer
 TCP case study
PROGRAMMING ASSIGNMENT 2
 Principles of congestion control
 TCP congestion control
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Course Overview:
Part 4: Network Layer (text: Ch. 4)
 introduction and network service model
 what’s inside a router?
 routing principles (algorithms)
 hierarchical routing
 IP: the Internet Protocol
 Internet routing: RIP, OSPF, BGP
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Course Overview:
Part 5: Link Layer, Local Area Networks (text:
Ch. 5)
 introduction, services
 error detection, correction
 multiple access protocols, LANs
 LAN addresses, ARP
 Ethernet
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Course Overview:
Part 6: Wireless and Mobile Networks (Ch 6)
 wireless link characteristics
 the wireless link:
 802.11
 cellular Internet access
 Mobility principles
 mobility in practice:
 mobile IP
 mobility in cellular networks
 Sensor network, vehicular network introduction
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Course Overview:
Part 7: Network Security (text: Ch. 8)
 what is network security?
 Introduction of cryptography
authentication: Who are you?
 integrity
 key distribution, certification
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 Internet security hot topics:
 Malware attacks, denial-of-service attacks,
countermeasures
 Secure email, firewall, honeypot, botnet
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Summary
 Introductory, practical
 Know basic networking programming
 All (almost) you need to know about
Internet, and applications
 Many acronyms, don’t be frustrated
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