Internal architecture of isp 54
- 1. Sub topic : Internal architecture of ISP . * 1
- 2. Recap In the previous class, you have learnt about • ARPA Net (Advanced Research Project Agency Net) • WWW (World Wide Web) * 2
- 3. 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 * 3
- 4. Internet Service Provider 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. * 4
- 5. Typical ISPs • WorldNet • AT & T • IBM Global Network • MCI • Netcom • UUNet etc * 5
- 6. Types of ISPs Depending on the Range ISPs can be • Local ISPs • Regional ISPs • National ISPs • International ISPs * 6
- 7. ISP ISP ISP ISP X X X X Regional ISP ……. Regional ISP X X National ISP Fig 1.Structure of a national ISP * 7
- 8. National ISP National ISP x National ISP NAP x x National ISP National ISP Fig.2.Interconnection of national ISPs * 8
- 9. ISP Connection Options • Home user connection • Business connection * 9
- 10. ISP Typical Home user connections • Dial-up • DSL • Broad band wireless access • Cable Modem • ISDN * 10
- 11. ISP Typical Business connections • DSL • SHDSL • Ethernet Technologies * 11
- 12. Fig.3.Internal Architecture of ISP Remote SMTP Set of access server modems server S U B S Internet C R I B E R Web Server S Router Router * 12
- 13. ISP Architecture consists of • Set of Modems • Remote Access Server • SMTP Server • Web Server • Routers * 13
- 14. Set of Modems • Convert Analog signal on the line to the Digital • Connect ISP to the Subscriber * 14
- 15. 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 * 15
- 16. SMTP Server • 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 * 16
- 17. Web Server • Subscribers can create their own web pages To provide value added services such as • News update • Weather information • Technical updates • Sports updates • Chat facilities * 17
- 18. Routers • It maintains routing tables • Subscribers may be connected to the Internet through Routers * 18
- 19. Summary In this class, you have learnt about • ISP (Internet Service Provider) • ISP types • Its Internal Architecture in detail * 19
- 20. Quiz (1) The function of RAS is (a) To Authenticate the subscriber (b) To maintains database of valid users (c) a&b both * 20
- 21. Frequently Asked Questions (1) Define ISP (2) Explain the Internal Architecture of ISP 21