Applications of IP Network Architectures IP 網路架構應用
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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
• 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
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