204325 data communication and computer networks · 1 data communication and computer networks...

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Data Communication and Computer Networks

รศ.ดร.อนนัต์ ผลเพิ่มAsso. Prof. Anan Phonphoem, Ph.D.

anan.p@ku.ac.th

http://www.cpe.ku.ac.th/~anan

Computer Engineering Department

Kasetsart University, Bangkok, Thailand

Aug 2016

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Outline

Growth of Computer Networking

Motivation

Data Communication

Networks

Protocols and Standards

Standard Organizations

Recent and Future Trends

The availability of high-quality teleconferencing systems

Some social networking applications such as

Facebook

Twitter

Google+

Many others

The Internet of Things (IoT) 3

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Future of the Internet

http://www.computerworld.com/s/article/9207961/Update_ICANN_assigns_its_last_IPv4_addresses

Internet of Things

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http://www.opinno.com/en/content/internet-things-0

Connected Living

6https://devcentral.f5.com/articles/security-sidebar-defending-the-internet-of-things

Connected Living

7http://www.jumpthecurve.net/wp-content/uploads/2014/03/ericssonthings1.jpg

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Future of the Internet

http://www.itworld.com/networking/231929/usenix-google-deploys-ipv6-internal-network

#Mobile Phone Subscribers

9http://www.itu.int/en/ITU-D/Statistics/Pages/stat/default.aspx

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Internet Users in Thailand

http://internet.nectec.or.th

13.4 M

Internet Users in Thailand

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1991

1995

2000

2005

2010

2015

2016

#People

(M

illio

n)

http://internet.nectec.or.th

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Ping

13

Trace Route

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“Warriors of The Net”

Sit Back and Relax

… Enjoy the show

http://www.warriorsofthe.net/

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Motivation

People

Communication Goal

Exchange / Share information (data)

Communication method

Past Present

Local Talk

Gesture

Printed document Electronic Document

Remote Mail

Telephone

TV

Email

Wireless Phone, Video Phone

Video conferencing

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Motivation

The Changes

Efficiency way to communicate

Sharing data and resources

Time – Faster

Size – bigger

Correctness – Accurate

Accessibility – Easier

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Networks

SD

iMac

Set of Devices

Media Links

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How can the communication happen ?

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Data Communication

Hi

How are you

doing?

How are youdoing?

Hi

01010001 01010001

Hi

10010001 10010001

How are you

01010100 01010100

doing?

Hi

How are you

doing?

UserComputer

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Data Comm. Components

Hi

How are you

doing?

5 Protocol

4 Medium

3 Receiver2 Sender

1 Message

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Client-Server Paradigm

Client

Server

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Application Program Interface (API)

Set of operation for application programmer

Specify arguments and semantics

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Example API

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send_eofrecv

API Calls

send

recv

await_contact

Server

recv

send

make_contact

Client

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API Data Type

To make it independent of OS and Network software

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Example API Calls

send_eofrecv

send

recv

await_contact

Server

recv

send

make_contact

Client

connection await_contact(appnum a)

connection make_contact(computer c, appnum a)

int send(connection con, char *buffer, int length, int flag)

int recv(connection con, char *buffer, int length, int flag)

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Echo Application

echoserver.c

echoclient.c

> echoserver 3800

> echoclient master.cpe.ku.ac.th 3800

HW assignment

1. Plot trend of #computer growth

2. Plot trend of #mobile phone growth

• Thailand

• Average of South East Asia Countries

• Select one country by your own

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Summary

Data Communication components

Network application program and API