1. COMP 2330 (3 units) Data Communications and Networking Name: Dr. Joseph NG Office: R707 (Sir Run Run Shaw Building) Phone: 2339-7864Email: jng@comp.hkbu.edu.hk HomePage: http://www.comp.hkbu.edu.hk/~jng Name: Dr. Hon Wah Tam Office: R713 (Sir Run Run Shaw Building) Phone: 2339-7093Email: tam@comp.hkbu.edu.hk TA Name: Mr. Calvin Kin Cheung Hui Email: kchui@comp.hkbu.edu.hk

2. Subject Outline Objectives To introduce the major concepts of data communication and computer networks; To provide an introduction to network programming; Network functions and protocols with reference to the ISO Reference Model and the existing local area networks will be studied. Textbook Stallings, William, Data and Computer Communications, 5th Edition, Prentice Hall, 1997. Assessment Continuous assessment (30%) Examination (70%)

3. Subject Outline (continue) Passing grade and Grade Distribution (Guidelines) A (10 +/- 5%) B (50 +/- 10%) C, D, F (40 +/- 15%) Average of this class should be either B- or C+. To pass this subject, the final exam should be higher than 30. To get the “A” grade, the overall score should be higher than 70. Each person, each semester can have one supplementary exam. The highest grade for supplementary exam is “D”. A warning for those copy cats Whoever get caught in copying homework and other assignments, the instructor has the right to penalize his/her grade when necessary.

4. Computer Networks --- An Overview Computer Network –A computer network is a communication system that allows computers to exchange information with each other in a meaningful way. –Computer networks may link computers that are all of the same type (homogeneous networks), or they may link computers of several different types (heterogeneous networks) –Size of the network: same room, same floor, same building, same campus, city, region/country, or across international boundaries. –Three abbreviations computer networks: LAN: Local area network offers high speed communication (10Mbps) between computers within a limited area. WAN: Wide area network can vary considerably. Usually covers the whole country. WAN may be provided by post, telephone and telegraph organizations. WAN also includes radio and satellite. MAN: Metropolitan area network is not yet well-defined. They offer a simple, fast way to link different organizations for the exchange of information with a similar degree of flexibility to that provided by LANs.

5. The International Standards Organization Reference Model of Open System Interconnection (ISO OSI model) Application Presentation Session Transport Network Data Link Physical interfaces Host AHost B 1 2 3 4 5 6 7 Subnet Boundary Message Packet Frame Bit

6. Applications on Computer Networks Sharing Resources –Computing power (main-frames, super-computers) –Databases (Air-line reservation, Banking accounts) –Archives (wuarchive, ftp.cica.indiana.edu, ftp.cs.cuhk.hk, ftp.cdrom.com) –Printers (line printer, laser printer, image printer) –Scanners –File server –Program libraries (X-windows, g++ lib, Motif) –Expensive software (CASE tools, CAD/CAM) Data Communication –File Transfer Protocol (FTP upload/download) –News Server (notesfile, Bulletin board) –Email –Voice mail, video mail, facsimile (FAX) –World Wide Web Server –talk, IRC, ICQ