1 CDA 4527 Computer Communication Networking (not “analysis”) Prof. Cliff Zou School of Electrical Engineering and Computer Science University of Central Florida Fall 2007

2 About my self  Office: HEC 335  Tel:  Office hour: Tuesday/Thursday 1pm – 3pm  Course webpage:  Graduated from Umass in Summer 2005  Research interests: Computer and network security  Malware modeling, simulation, detection, defense  denial-of-service attack, software security  Other Internet security Network modeling, optimization and performance evaluation

3 What is this course about?  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  TCP/IP, 2 networking programming projects  Several lab assignments (fun, real)  (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)

4 Student evaluation of this course  Fall 2005 (18):  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%

5 Course information  Prerequisites:  Basic knowledge on Algorithms and Operating Systems  C or C++ programming skills  Basic usage of Linux  Olympus account + my lab Linux for networking programming  Course materials:  Text: Computer Networking: A Top Down Approach Featuring the Internet, J. Kurose & K. Ross, Addison Wesley, 4 rd ed., 2007  Textbook online resource (see first page)  Class notes

6 Course information (more) Coursework approx amount approx % written homeworks % programming (C) 2 (3?) 20% lab assignments (Ethereal) % midterm exam 1 20% final exam 1 30% one-minute in-class paper ? 5% The final grade will use +/- policy, i.e., you may get A, A-, B+, B, B- … grade.  Workload:

7 Course information (even more)  In-class style: interaction, questions  Real network programming (fun)  Hands on experience: packet trace, spam  Flexible:  Teaching difficulty/speed/contents based on your feedback please  So please tell me freely your thinking and interests!  Academic honesty

8 A top-down approach: We’ll cover networking top-down  End-system applications, end-end transport  Network core: routing, hooking nets together  Link-level protocols, e.g., Ethernet  Other interesting stuff:  Security  wireless regional ISP local ISP company network

9 Course Overview: Part 1: Introduction (text: Chapter 1)  What is the Internet? Application Network Data Link Transport Data Link Physical link Web, , VOIP TCP, UDP IP Ethernet, cellular

10 Course Overview: Part 2: Application Layer (text: Ch. 2)  Principles of application-layer protocols  World Wide Web: HTTP  File transfer: FTP  Electronic mail:  The Internet's directory service: DNS  VOIP (Voice Over IP)  Socket programming PROGRAMMING ASSIGNMENT 1

11 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

12 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  IP: the Internet Protocol  Internet routing: RIP, OSPF, BGP

13 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

14 Course Overview: Part 6: Wireless and Mobile Networks (Ch 6)  wireless link characteristics  the wireless link:   cellular Internet access  Mobility principles  mobility in practice:  mobile IP  mobility in cellular networks  Sensor network, vehicular network introduction

15 Course Overview: Part 7: Network Security (text: Ch. 8)  what is network security?  Introduction of cryptography  authentication: Who are you?  integrity  key distribution, certification  Internet security hot topics:  Malware attacks, denial-of-service attacks, countermeasures  Secure , firewall, honeypot, botnet