Introduction to CS447 Department of Computer Science Southern Illinois University Edwardsville Fall, 2015 Dr. Hiroshi Fujinoki E-mail: [email protected].

Introduction to CS447

Department of Computer ScienceSouthern Illinois University Edwardsville

Fall, 2015

Dr. Hiroshi FujinokiE-mail: [email protected]

CS447 - Networks and Data Communications

Introduction/000


Introduction/001

Agenda

• Types of networks this course will deal with

• Topics this course will discuss

• What this course is about

• What this course is NOT about

• Programming projects expected in this course

Applications (application software)

System Software


Introduction/002

Topics this course will discuss

Three logical layers in computer networks

Hardware

• E-mail

• Web-browser

• Streaming audio/video

• On-line banking • Telephony

• Game

• Routers

• Cables

• Switches

• Modems • Ethernet adapters

• Wireless transmitters

• Routing protocols• HTTP• TCP• IP

• FTP• UDP

• SSL• Error control• Flow control• Compression

• Routing algorithms

ComputerManagementInformation

System

ElectricalEngineering

ComputerScience

The areas this course(CS447) will deal with

Protocols Algorithms

Algorithms = design/logicsProtocols = implementation


Introduction/003

Types of networks this course will deal with

• Circuit-Switching Networks

• Packet-Switching Networks

- Before you start transmission, you need to reserve network resources

- You hold the resources until you complete your transmission

- You can start transmission any time

- Network resources are shared

- Telephone networks

- Internet

CommunicationNetworks

- Data is transmitted as a stream of signals

- Data is transmitted by packets


Introduction/004

Analog Switch

Analog Switch Analog Switch

Analog Switch


Analog Signal

Analog Signal Analog Signal

Analog Signal

Analog Signal

Circuit-Switching Networks Example: Public telephone networks


Introduction/005

Example: Public telephone networks Circuit-Switching Networks

Analog Switch


Analog Switch


Analog Signal

Analog Signal

Analog Signal

Analog Signal

Analog Signal


Introduction/006

Digital SwitchDigital Switch

Digital Switch Digital Switch



Analog Signal

010100 111

111

010

100

111

010

100

111

010

100

111010 100

010100111

Analog Signal

010100111Digitized data

Sender PC Receiver PC

Packet-Switching Networks Example: Internet


Introduction/007

Types of networks this course will deal with

• Circuit-Switching Networks

• Packet-Switching Networks

- Before you start transmission, you need to reserve network resources

- You hold the resources until you complete your transmission

- You can start transmission any time

- Network resources are shared

- Telephone networks

- Internet

CommunicationNetworks

- Data is transmitted as a stream of signals

- Data is transmitted by packetsThis course willmainly discuss

packet-switchingnetworks


Introduction/008

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/009

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)

Data transmission protocols

Network application software

Various data transmission and routing algorithms


Introduction/010

2. Understanding how the network hardware and software components work

• Design Concepts

• Implementation

3. Understanding how to make sure the things work as expected

• Performance Evaluation

• Performance Prediction

- What are the purposes of the network system software?

- How are the network system software designed?

- How can we (our network application software) develop the system software or network application programs?

- We cover this by programming assignments

- How can we measure the performance of the system software?

- How can we predict the performance?


Introduction/011

4. Understanding fundamental network programming skills

• Almost all network applications that use TCP/IP depend on “socket interface” to perform any network activity.

• 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

= “winsock” libraryWindows

UNIX/LINUX = socket libraryHave syntax-level compatibility

- You can develop any network application using socket

• Most of the high-level programming languages have socket library included in it


Introduction/012

Understanding components in computer networks (lectures and quizzes)

Design Concepts

Performance Evaluationand Prediction

Weight for subjects

Implementation(programming assignments)


Introduction/013

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


Programming projects expected in this course

Application Layer

System Software Layer

Hardware Layer

E-mail Streaming

Audio/Video

Game

Telephony

Tele-Conferencing

Hardware(Network Adapter)

TCP

IP

Socket Interface (as function calls)

Device Drivers

WWW

Introduction/014

What programmingproject covers


Introduction/015

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).

Only “function-level” copy is allowed (up to 5 to 6 lines in the entire work) Source must be mentioned

NO

NO

NO

NO

YES

Introduction to CS447 Department of Computer Science Southern Illinois University Edwardsville Fall, 2015 Dr. Hiroshi Fujinoki E-mail: [email protected].

Documents

packetscs447 networks

internetcs447 networks

implementationcs447

coursecs447 networks

itcs447 networks

networks packet

network system software

network applications