1 CDA 4527 Computer Networking Prof. Cliff Zou School of Computer Science University of Central Florida Fall 2005

2 About my self  Office: CSB 223  Tel:   Newly graduated from Umass ( )  Have MS and BS from China  Research interests: Computer and network security  Virus/worm modeling, simulation, detection, defense  Intrusion detection, denial-of-service attack  Wireless security Network modeling, optimization and performance evaluation

3 What is this course about? Introductory course in “computer networking”  What is a “computer network”?  Principles, practice of computer networking  Focus on Internet architecture/protocols Goals:  Learn a lot (facts, principles and practice)  Have fun (Use/apply/understand real world network immediately)

4 Course information  Prerequisites:  Algorithms, basic knowledge on Operating Systems  C or C++ programming skills  Why not Java?  Course materials:  Text: Computer Networking: A Top Down Approach Featuring the Internet, J. Kurose & K. Ross, Addison Wesley, 3 rd ed., 2004  Textbook online resource  Class notes (Job market needs)

5 Course information (more) Coursework approx amount approx % written homeworks % programming (C,C++) 2 15% lab assignments (Ethereal) % midterm exam 20% final exam 30% one-minute in-class paper ? 10%  Workload:

6 Course information (even more)  In-class style: interaction, questions  Flexible:  Teaching difficulty/speed/contents based on your feedback please  So please tell me freely your thinking and interests!  Academic honesty

7 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, mobility regional ISP local ISP company network

8 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

9 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  Socket programming PROGRAMMING ASSIGNMENT 1

10 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

11 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

12 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

13 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

14 Course Overview: Part 7: Network Security (text: Ch. 7)  what is network security?  principles of cryptography  authentication: Who are you?  integrity  key distribution, certification  firewalls  attacks, countermeasures  case studies: SSL, IPsec,