Applications of IP Network Architectures

IP 網路架構應用

• Introduction

• Internet

• Intranet

• General Purpose Radio Services (GPRS)

• Conclusions

Contents

• Network Advantages– Resource sharing

• Make all programs, data, and equipment available to anyone on the network

– High reliability• Replicate files to two or more computers for

tolerating failures

– Saving money• Several small computers has a much better

price/performance than a large one

Introduction

Introduction• Network Protocols

– A set of rules for governing communication for computers over a network

– OSI Reference Model – TCP/IP Model

Introduction• Network Protocols (Cont.)

OSI Model TCP/IP• Application

Application• Presentation

• Session

• Transport Transport

• Network Internet

• Data Link Network Interface

• Physical

Introduction• TCP/IP

– IP addressing• A unique identity for the networked computer

– IP routing• How to transmit packet data

Internet• What Is Internet?

– Consisting of a lot of networks over the world

– Connecting to each other using the IP protocol as the network layer

Internet• Internet in Taiwan

ConnectedUncertain

TANet: Taiwan Academic Network

Internet

TANetHiNet

SeedNet

ISP: Internet Service Provider

Internet• HiNet to Other Networks

HiNet

Internet

OtherISPs

OtherISPs

SingNet

HKT/Netplus

TANet

SeedNet

KORNET/DACOM

JapanKDD

JapanIDC

AT&TGlobal-one

JapanJT

Internet• Access Ways to Internet

– Dial-up Internet

PSTN HiNetBackbone

接取伺服器

接取伺服器

接取伺服器

電話線T1

T1

T1

數據機

RS-232

Internet• Access Ways to Internet

– Leased lines

Leased Line Router RouterDSU/CSU DSU/CSU

用戶端 網路端

Internet

HiNetBackbone

Intranet• What Is Intranet?

– Connecting an affilicated set of clients behind a firewall

– Using the standard Internet protocol (TCP/IP)

– Provisioning of a secure environment

Intranet• Intranet’s Home Page

Intranet• Internet’s Home Page

Intranet

分公司 (所 )辦公大樓

CHT WAN

營運處

Hub

LAN Switch

RouterServer

LAN SwitchRouter

Hub

Router

服務中心服務中心Server

直立式外殼

FireWall

HiNet

Web Server for Internet

Web Server for Intranet

DNS Server

Mail Server

Hub Hub

Hub Hub

• Architecture Internet

Intranet• Intranet Elements

– Application servers• Web servers

– World Wide Web (WWW) services

• FTP servers– File transfer services

• E-mail servers– Electronic mail services

• Etc.

Intranet• Intranet Elements (Cont.)

– Network management• Domain Name Servers (DNS)

• Firewall

• Hubs

• Switches

• Routers

• Etc.

Intranet• WWW Service

– Universe of network-accessible information– Hypertex an multimedia for anyone to brows

e– HyperText Transfer Protocol (HTTP) protoc

ol to communicate between client and server

Intranet• E-Mail Service

– Sending a mail message between two users or more

• Header

• Texts

– Simple Mail Transfer Protocol (SMTP) for transferring e-mail messages

Intranet• E-Mail Service (Cont.)

Intranet• FTP Service

– Copying files from a file server to a local client through a network

• FTP Service (Cont.)– Download Example

Intranet

Intranet• DNS

– Name resolution • www.hinet.net→ 210.219.251.248

DNS

Network

What is the IP addressof www.hinet.net?

http:www.hinet.net

www.hinet.net address is210.219.251.248

Intranet• Firewall

– Intercepting the data between Internet and hosts within the intranet

– All Internet traffic through it– Authorizing users/data to get into or go out

the Intranet

• Firewall (Cont.)– Deployment

Intranet SynchronizesSession State

Internet

Firewall

Active pathsStandby paths

Firewall

Intranet

Switch

SwitchSwitch

Switch

Intranet• Hubs

– Offering a connection to a network

• Switches– Offering connections between two or more

hosts

• Routers– Offering connections between two or more

networks

GPRS• What IS GPRS?

– A packet network attached on GSM

GS

M N

etw

ork

A

HLR

PSTN

MSC/VLR

BSC

GSMBTS

D

Packet Switched Data

Circuit Switched Data/Voice

GGSN: Gateway GPRS Support Node

SGSN: Serving GPRS Support Node

PCU: Packet Control Unit

PCU

GP

RS

Cor

e N

etw

ork

InternetPSDN

GGSN

SGSN

Gn

Gi

Gb

Gr

Gs

GPRS• GPRS Services

– Wireless Application Protocol (WAP)

GPRS GPRS NetworkNetwork InternetInternet

WAPWAPServersServers WAPWAP

ServersServers

WebWebServersServers

CorporateCorporateIntranetIntranet CorporateCorporate

IntranetIntranet

ISPISP

Email/Email/News...News...ServersServers

GPRS GPRS NetworkNetwork InternetInternet

WAPWAPServersServers WAPWAP

ServersServers

WebWebServersServers

CorporateCorporateIntranetIntranet CorporateCorporate

IntranetIntranet

ISPISP

Email/Email/News...News...ServersServers

• GPRS Services (Cont.) – Wireless Virtual Private Network (WVPN)

GPRS

• Innovative Wireless Operators – NTT DoCoMo i-Mode Service

• Email

• Picture and melody downloads

• Directories

• Mobile banking

• Games

• Horoscopes

• Travel and transport information

GPRS

GPRS• Top Mobile Data Services

Conclusions• Internet

– IP Technology

• Intranet– Secure private networks

• GPRS– Packet network equipped on the GSM to

provide up to 114kbps data service