internal architecture of isp 54
TRANSCRIPT
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Sub topic : Internal architecture of ISP
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Recap
In the previous class, you have learnt about
• ARPA Net (Advanced Research Project Agency Net)
• WWW (World Wide Web)
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OBJECTIVES
On completion of this period, you would be able to know about
• ISP
• Typical ISPs
• Types of ISPs
• ISP connection options
• Internal Architecture of ISP
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ISP is an Internet Service Provider that provides
• Internet access to the Individuals
• Internet access to the Companies
• Services such as web site building and virtual hosting
• It can also be called as a Internet Access Provider.
Internet Service Provider
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Typical ISPs
• WorldNet
• AT & T
• IBM Global Network
• MCI
• Netcom
• UUNet etc
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Depending on the Range ISPs can be
• Local ISPs
• Regional ISPs
• National ISPs
• International ISPs
Types of ISPs
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ISP ISP ISP ISP
Regional ISP Regional ISP
National ISP
X X
X XXX
Fig 1.Structure of a national ISP
…….
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National ISP
National ISPNational ISP
National ISP National ISP
NAP
xx
x
Fig.2.Interconnection of national ISPs
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• Home user connection
• Business connection
ISP Connection Options
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• Dial-up
• DSL
• Broad band wireless access
• Cable Modem
• ISDN
Typical Home user connections
ISP
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• DSL
• SHDSL
• Ethernet Technologies
Typical Business connectionsISP
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Fig.3.Internal Architecture of ISP
Router
Router
Internet
SUBSCRIBERS
Set of modems
Remote access server
SMTP server
Web Server
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• Set of Modems
• Remote Access Server
• SMTP Server
• Web Server
• Routers
ISP Architecture consists of
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• Convert Analog signal on the line to the Digital
• Connect ISP to the Subscriber
Set of Modems
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Remote Access Server
• All subscribers are connected to RAS through set of
modems
• Maintains database of valid user id and password
• It also verifies user id and password
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• It is Simple Message Transfer Protocol
• It stores subscribers e-mails until the subscriber connects
to the internet
• It sends and receives mails on behalf of its subscriber
SMTP Server
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• Subscribers can create their own web pages
To provide value added services such as
• News update
• Weather information
• Technical updates
• Sports updates
• Chat facilities
Web Server
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• It maintains routing tables
• Subscribers may be connected to the Internet
through Routers
Routers
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In this class, you have learnt about
• ISP (Internet Service Provider)
• ISP types
• Its Internal Architecture in detail
Summary
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(1) The function of RAS is
(a) To Authenticate the subscriber
(b) To maintains database of valid users
(c) a&b both
Quiz
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(1) Define ISP
(2) Explain the Internal Architecture of ISP
Frequently Asked Questions