Download Internet

Applications of IP Network Architectures
IP 網路架構應用
Contents
•
•
•
•
•
Introduction
Internet
Intranet
General Purpose Radio Services (GPRS)
Conclusions
Introduction
• 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
• 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
• Presentation
Application
• 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
Internet
TANet
HiNet
SeedNet
Connected
Uncertain
TANet: Taiwan Academic Network
Internet
• HiNet to Other Networks
Japan
KDD
Internet
Global-one
AT&T
Japan
IDC
TANet
HiNet
Japan
JT
SingNet
SeedNet
Other
ISPs
Other
ISPs
KORNET/
DACOM
HKT/
Netplus
ISP: Internet Service Provider
Internet
• Access Ways to Internet
– Dial-up
數據機
RS-232
Internet
T1
電話線
PSTN
T1
接取伺服器
接取伺服器
T1
接取伺服器
HiNet
Backbone
Internet
• Access Ways to Internet
– Leased lines
Internet
Leased Line
Router DSU/CSU
用戶端
DSU/CSU
網路端
Router
HiNet
Backbone
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
• Architecture
Mail Server
FireWall
Internet
HiNet
Router
LAN Switch
直立式外殼
Web Server for Internet
Hub Hub
CHT WAN
Web Server for Intranet
DNS Server
營運處
分公司(所)辦公大樓
Router
Server
服務中心
LAN Switch
Hub
Hub
Router Server
Hub
Hub
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
browse
– HyperText Transfer Protocol (HTTP)
protocol 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
Intranet
• FTP Service (Cont.)
– Download Example
Intranet
• DNS
– Name resolution
• www.hinet.net→ 210.219.251.248
What is the IP address
of www.hinet.net?
DNS
http:www.hinet.net
Network
www.hinet.net address is
210.219.251.248
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
Intranet
• Firewall (Cont.)
– Deployment
Firewall
Switch
Intranet
Switch
Internet
Synchronizes
Session State
Switch
Firewall
Active paths
Standby paths
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
PSDN
D
MSC/
VLR
A
BSC
GSM
BTS
PCU
Internet
Gi
HLR
Gr
GGSN
Gs
Gn
Gb
SGSN
Packet Switched Data
Circuit Switched Data/Voice
GPRS
Core Network
GSM Network
PSTN
GGSN: Gateway GPRS Support Node
SGSN: Serving GPRS Support Node
PCU: Packet Control Unit
GPRS
• GPRS Services
– Wireless Application Protocol (WAP)
Corporate
Intranet
GPRS
Network
ISP
Corporate
Intranet
Internet
Web
Servers
Email/
News...
Servers
WAP
Servers
WAP
Servers
GPRS
• GPRS Services (Cont.)
– Wireless Virtual Private Network (WVPN)
Corporate
Intranet
GPRS
Network
ISP
Corporate
Intranet
Internet
Web
Servers
Email/
News...
Servers
WAP
Servers
WAP
Servers
GPRS
• Innovative Wireless Operators
– NTT DoCoMo i-Mode Service
•
•
•
•
•
•
•
Email
Picture and melody downloads
Directories
Mobile banking
Games
Horoscopes
Travel and transport information
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