Computer Networks Paper Coordinator: Dr. Napoleon H. Reyes, Ph.D. Computer Science Institute of Information and Mathematical Sciences Rm QA, or IIMS Lab 7 Tel. No.: x 9512 or Fax No.:

Lectures Lectures: Monday 11:00 am 1hr QB2 Tuesday 9:00 am 1hr AT3 Friday 11:00am 1 hr QB Consultation Hours: Tuesdays, immediately after the lecture

Topics for Discussion Pre-requisites, Aims Course Overview Learning Outcomes Texts and Course Material Assessment Course Schedule

Pre-requisites To take this course the student must have passed and , since elementary programming knowledge is assumed. It will be helpful, although not mandatory, to have also completed

Overview A top-down approach is used in this paper. The course begins with the application layer and works towards the physical layer. The students should benefit from this approach because they usually have already some experience with the applications, and the explanations related to the other layers are presented in inverse order. It is also beneficial to motivate students to search and learn in depth from the start. Students are expected to have intermediate programming skills in C (or C++) language. All the assignments are based on simple programming tasks to experiment with certain network concepts. After taking this paper, students should be capable of understanding and learning new and emerging technologies in the field of computer networks.

Student Responsibility Note: If a student cannot attend lectures, it is the student’s responsibility to find out what was discussed in lectures / tutorials (possible changes to assignments, some tips in writing programs for the assignment).

Texts and Course Material Kurose, J.F. And Ross, K. W., Computer Networking: a Top Down Approach, Addison Wesley, 5th edition (2010) ISBN-10: Main text book Other References Data communications and networking / Behrouz A. Forouzan

What is Computer Networks? Low level network programming Socket level programming (159334!) Implementing Network Protocols TCP/IP, UDP Not Client side Graphical User Interfaces IS (157.___!) Not a “how to” design a cool fancy website

Relation to other courses Internet Programming (159339)Internet Programming (159339) – Technologies that support Web based applications – Server Side Application Programming – Client side programming – Database driven applications Client-side Graphical User InterfacesClient-side Graphical User Interfaces – Courses offered by IT (158.XXX) – (Designing cool websites).NET programming.NET programming – IT courses – Microsoft training courses

Relation to the Internet Protocol Stack

Client: makes a request Client (browser) Web browser os Web server os Server Internet requests an Internet resource by specifying a URL and providing input via HTTP encoded strings Network Core GET hello.php HTTP/1.1 Host:

Client Web browser Web server HTML Server MySQL Operating System PHPinterpreter Internet My codes HTTP TCP/IP Webserver supports HTTP. Server: responds Application layer Transport layer Network layer Data Link Layer Physical Layer

Client Web browser Web server HTML Server MySQL Operating System PHPinterpreter Internet My codes HTTP TCP/IP Server: responds Internet Operating System MySQL server could be anywhere in the world In this paper, we will write our own server!

A layered approach to data communications and the Internet protocols. What is Computer Networks?

Course Schedule 1 – Introduction: Definition of networks, history, standardization, protocols. 2 - The application layer: Principles, HTTP, FTP, Mail (SMTP, POP etc), DNS, socket programming. 3 - The transport layer: Elements of transport protocols (reliability, multiplexing/de-multiplexing, congestion control), Internet transport protocols (TCP, UDP), performance issues.

Course Schedule 4 - The network layer: Addressing, routing, network layer in the Internet (IP) 5 - The data link layer: Error detection and correction, hubs bridges and switches, IEEE The physical layer: Data communication theories. 7 - Network security: Concepts, cryptography principles, authentication, integrity, firewalls

Relate computer network techniques, services and products to each other. Learning Outcomes Understand the basic Computer Network concepts, different protocols and related acronyms. Apply concepts and principles to network design and management using the current standards. On successful completion of the course, the students should be able to: Understand professional and ethical issues arising from communications systems and their application, especially concerning internet security. Write low-level network programs using sockets.

Assessment 3 assignments: 40% Final Exam (3 hours): 60% The course will be assessed by a combination of practical and theoretical works. CLOSED BOOKThere will be 3 practical assignments and one three hour exam. The exam will be a CLOSED BOOK exam. Bring your calculator in the exam. All assignments will be submitted electronically. To complete the paper: At least 50% of the sum of the three assignments and the final exam.

Assessment Program solutions that do not compile or do not run in our laboratories get 0 marks. Late assignments will be penalized Assignments may be completed in groups all members of the group should be named in the source file of each assignment, including the contribution of each member. All submitted assignments will have to be accompanied by a short documentation as well. There can be at most 3 members in a group.

Assessment Each group member will receive the same grade. Students in a team have the authority (in consultation with the lecturer) to "expel" any member that does not meet obligations. The collaboration is limited only to members within each group. It is the students’ responsibility to check their assignment marks and notify in writing any errors they might find no later than 10 days after the day the marks were made available.

Assignment for Today Send me an , with a subject heading Please indicate your full name and a bit of background in your message so that I may include you in my sending list for any announcements in the future for the class. Subject heading: body: your full name and background (e.g. Name: Napoleon Reyes Background: Profession: Network administrator, papers taken: )