1. 1 CNT 4704 Analysis of Computer Communication Networks Cliff Zou Department of Electrical Engineering and Computer Science University of Central Florida Fall 2015

2. 2 About my self  Office: HEC 243  Tel: 407-823-5015 czou@cs.ucf.edu  Office hour:Monday/Wednesday 10:15pm – 11:45pm  Course webpage: http://www.cs.ucf.edu/~czou/CNT4704-15 r UCF Panopto for online lecture video streaming  Webcourse has a link and Syllabus  Each lecture will be posted several hours after a class r Use Webcourse@UCF for homework assignment and grading m Keeping grade private m Easy homework submission m Having a simple BBS channel

3. 3 What is this course about?  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)  Email (spam), Web. Ethernet, hub, wireless LAN  One chapter on Internet security introduction  Newly added content (not in textbook):  Cellular and mobile technologies  Wireless security

4. 4 Course information  Prerequisites:  Basic knowledge on Algorithms and Operating Systems  C or C++ programming skills  Basic usage of Linux  Eustics account for networking programming  Course materials:  Text: Computer Networking: A Top Down Approach Featuring the Internet, J. Kurose & K. Ross, Addison Wesley, 6th ed., 2013  Previous editions (4th,5th) would also be fine  Textbook online resource (see first page)  Class notes

5. 5 Course information (more) The final grade will use +/- policy, i.e., you may get A, A-, B+, B, B- … grade. Because this class has online session, the two exams are open book and similar to all regular homework assignments, except that they have a 24-hour submission constraint.  Workload: CourseworkApproximate amountapproximate percentage Written homework224% Programming projects 226% Lab assignments321% Midterm exam114% Final exam115%

6. 6 Course information (even more)  In-class style: interaction, questions  Real network programming (fun)  Hands on experience: packet trace, email spam, Wifi attack…  Flexible:  Teaching difficulty/speed/contents based on your feedback please  So please tell me freely your thinking and interests!  Academic honesty

7. 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 regional ISP local ISP company network

8. 8 Course Overview: Part 1: Introduction (text: Chapter 1)  What is the Internet? Application Network Data Link Transport Data Link Physical link Web, Email, VOIP TCP, UDP IP Ethernet, cellular

9. 9 Course Overview: Part 2: Application Layer (text: Ch. 2)  Principles of application-layer protocols  World Wide Web: HTTP  Electronic mail: Email  The Internet's directory service: DNS  Socket programming PROGRAMMING ASSIGNMENT 1

10. 10 Course Overview: Part 3: Transport Layer (text Ch. 3)  Transport-layer services and principles  Connectionless transport: UDP  Principles of reliable of data transfer  TCP case study PROGRAMMING ASSIGNMENT 2 on realizing TCP reliable data transmission based on a simulator  TCP congestion control

11. 11 Course Overview: Part 4: Network Layer (text: Ch. 4)  what’s inside a router?  routing principles (algorithms)  hierarchical routing  IP  IP: the Internet Protocol  Internet routing: RIP, OSPF, BGP

12. 12 Course Overview: Part 5: Link Layer, Local Area Networks (text: Ch. 5)  introduction, services  error detection, correction (CRC code)  multiple access protocols, LANs  LAN addresses, ARP  Ethernet

13. 13 Course Overview: Part 6: Cellular, Wireless and Mobile technologies  Extension of Chapter 6  Overview of smart phone technologies  Overview of IOS and Andriod operating systems  Mobile protocols  Mobile logical channel descriptions, registration procedures, encryptions standards  Mobile identifiers, and Location-based Services

14. 14 Course Overview: Part 7: Wireless security and Network Security (extension of Chapter 8)  what is network security?  Introduction of cryptography m Classical and modern cryptography m Public key cryptography and its applications  Cellular network vulnerabilities and security protocols  Wifi vulnerabilities and security protocols

15. 15 Summary r Introductory, practical r Know basic networking programming r All (almost) you need to know about Internet, and applications r Many acronyms, don’t be frustrated m If you don’t know an acronym, just google it m Wikipedia is a great resource to learn!