1. CS447 - Networks and Data Communications
Introduction to CS447
Department of Computer Science
Southern Illinois University Edwardsville
Fall, 2017
Dr. Hiroshi Fujinoki
Introduction/000

2. CS447 - Networks and Data Communications
Agenda
Topics this course will discuss
Types of networks this course will deal with
What this course is about
What this course is NOT about
Programming projects expected in this course
Introduction/001

3. CS447 - Networks and Data Communications
Topics this course will discuss
The areas this course
(CS447) will deal with
Three logical layers in computer networks
Computer
Management
Information
System
Electrical
Engineering
Science
Applications
(application software)
Web-browser
Streaming audio/video
On-line banking
Telephony
Game
Protocols
Algorithms
System Software
Error control
Flow control
Compression
Routing algorithms
Routing protocols
HTTP
TCP IP
FTP
UDP
SSL
Hardware
Routers
Cables
Switches
Modems
Ethernet adapters
Wireless transmitters
Protocols = implementation
Algorithms = design/logics
Introduction/002

4. CS447 - Networks and Data Communications
What this course is about
1. Understanding major components in computer networks
2. Understanding how the network hardware and software
components work
3. Understanding how to make sure the things work as expected
4. Understanding fundamental network programming skills
Introduction/003

5. CS447 - Networks and Data Communications
1. Understanding components in computer networks
- What are the major network hardware components?
- What are the major network software components?
Data transmitting devices (NICs)
Switching devices (Repeaters, Hubs, Switches and Routers)
Network Cables (Copper wire, Optical fiber)
Network application software
Data transmission protocols
Various data transmission and routing algorithms
Introduction/004

6. CS447 - Networks and Data Communications
2. Understanding how the network hardware and software components work
Design Concepts
- What are the purposes of the network system software?
- How are the network system software designed?
Implementation
How can we (our network application software) develop
the system software or network application programs?
- We cover this by programming assignments
3. Understanding how to make sure the things work as expected
Performance Evaluation
- How can we measure the performance of the system software?
Performance Prediction
- How can we predict the performance?
Introduction/005

7. CS447 - Networks and Data Communications
4. Understanding fundamental network programming skills
Almost all network applications that use TCP/IP depend on “socket
interface” to perform any network activity.
- You can develop any network application using socket
Socket interface is provided as a set of functions (a. k. a., “API”) that
application programs can call to perform network activities
Each platform has its own socket interface
Windows
UNIX/LINUX
= “winsock” library
Have syntax-level compatibility
= socket library
Most of the high-level programming languages have socket library
included in it
Introduction/006

8. CS447 - Networks and Data Communications
What this course is NOT about
Learning products from particular software/hardware venders
- Learn DreamWeaver for developing web home pages
- Learn how to set up routers from particular manufactures
- Learn how to make a home page using HTML, PHP, MS ASP, etc.
Preparing for particular network certificate
- Understanding topics in this course will provide a foundation
for those certificate
After all, this course is never meant for particular network products
Not for anything that does not require understanding of working
of underlying networks
Introduction/007

9. CS447 - Networks and Data Communications
Definitions for academic dishonesty
Can we do this?
1. Get a source code from somebody’s website and modify it.
2. Get a source code from a friend and modify it.
3. Work with your friend and create a source code. Then modify it.
4. Get source code given by a professor in another course and modify it.
5. Study example source code from a book and develop your own (instead of
copying it).
 NO
 NO
 NO
 NO
 YES
Introduction/008

10. CS447 - Networks and Data Communications
Final Course Distribution: CS447 Fall 2016 A B C D F
Introduction/009

11. CS447 - Networks and Data Communications
Final Course Distribution: CS447 Fall 2016
A: 13.9%
F: 33.3%
B: 11.1%
D: 11.1%
C: 30.6%
Introduction/010

12. CS447 - Networks and Data Communications
 For those who are taking more than 15 CRHs, please be very careful
for your time management
(or even consider reducing your CRHs).
 For transfer students: if this is your first semester at SIUE, be careful
 I try to provide help if you need, but you need to talk to me when you need
some help (“help” does not mean I do your work – you still need to do your
work).
 This course requires commitment (time and effort)
Introduction/011

13. CS447 - Networks and Data Communications
Types of networks this course will deal with
Circuit-Switching Networks
Packet-Switching Networks
Data is transmitted as a stream of signals
Before you start transmission, you
need to reserve network resources
You hold the resources until you
complete your transmission
Communication
Networks
Telephone networks
Data is transmitted by packets
You can start transmission any time
Network resources are shared
Internet
Introduction/012

14. Circuit-Switching Networks
CS447 - Networks and Data Communications
Circuit-Switching Networks
Example: Public telephone networks
Analog Signal
Analog Switch
Analog Switch
Analog Signal
Analog Signal
Analog Signal
Analog Signal
Analog Switch
Analog Switch
Analog Switch
Analog Switch
Introduction/013

15. Circuit-Switching Networks
CS447 - Networks and Data Communications
Circuit-Switching Networks
Example: Public telephone networks
Analog Signal
Analog Switch
Analog Switch
Analog Switch
Analog Switch
Analog Switch
Analog Switch
Introduction/014

16. Packet-Switching Networks
CS447 - Networks and Data Communications
Packet-Switching Networks
Example: Internet
111
010
100
Digital Switch
111
010
100
111
010
100
Sender PC
Receiver PC
111
010
100
010
100
111
Digitized data
Analog Signal
Analog Signal
Introduction/015

17. CS447 - Networks and Data Communications
Types of networks this course will deal with
Circuit-Switching Networks
Data is transmitted as a stream of signals
Before you start transmission, you
need to reserve network resources
You hold the resources until you
complete your transmission
Communication
Networks
Telephone networks
Packet-Switching Networks
Data is transmitted by packets
This course will
mainly discuss
packet-switching
networks
You can start transmission any time
Network resources are shared
Internet
Introduction/016