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1: Internet & Its Uses

1: Internet & Its Uses. Working at a Small-Medium Business or ISP. Back to the Future. Internet is a network of networks Originally for military, science research Available to consumers in 1991 New applications/uses being developed. Follow That Standard.

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1: Internet & Its Uses

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  1. 1: Internet & Its Uses Working at a Small-Medium Business or ISP

  2. Back to the Future • Internet is a network of networks • Originally for military, science research • Available to consumers in 1991 • New applications/uses being developed

  3. Follow That Standard • Internet has standards to follow too • New standards tracked in RFC document

  4. Connect Me! • You connect to ISP • Remember the ISP services?

  5. Which ISP?

  6. Internet Delivery 1

  7. Internet Delivery 2

  8. Metro Ethernet

  9. Select Carefully • Does the ISP have the right services? • Will it meet the growth of the company? • Example: PatNet ISP offers $5/month & 5 email addresses to Fisher Realty • What if 2 years from now Fisher Realty has an office with 12 employees & now needs a web presence? • Switching ISP’s creates more work & hassle

  10. U to the I…to the S…to the P • You connect to the POP • POPs connect to ISP high-speed links

  11. Internet Hierarchy- IXP

  12. Tier 1 ISP • MCI, Sprint, AT&T, Cable and Wireless • Top of hierarchy • They interconnect privately (PEERING) • Connect at IXP • Own the fiber cables

  13. Sprint- Tier 1

  14. Tier 2 ISP • Smaller Regional ISPs • Connects to Tier 1 & with other Tier 2’s • Connects to IXP • Tier 2 pays Tier 1 for connectivity

  15. Tier 3 ISP • Connect to Tier 2 • Local “mom & pop” ISP (Jersey.net)

  16. Ping & Tracert • Ping- connectivity test (echo request) • Time it takes to travel • Whether it’s reachable • Tracert (Windows) shows path • Traceroute (Router CLI) shows path • Lab 1.2.3

  17. Review • If you ping, do you (as the source) send out an echo request or an echo reply? • Echo request • What Tier ISP peers with others same sized ISP’s to form the backbone? • 1 • What is the name of the connection point where you connect to the ISP? • POP

  18. Review • Which test is this? • Tracert • What connects the backbones? • IXP (Internet Exchange Point) • What year did the Internet become widely available for consumers? • 1991

  19. ISP Devices • Needs to connect to other ISPs & handles lots of traffic • DSLAM • CMTS • Modems for dial-up • Wireless Bridging • Border gateway routers • Servers for client services • Power Conditioning Equipment • Air Conditioners

  20. ISP Requirements • Must be reliable & scalable • Other wise loss of customers= no money • Device that are modular are good! • Packet Tracer Lab 1.3.1.3

  21. ISP Roles & Responsibilities

  22. Activity

  23. Review • When you ping, what does RTT mean? • Round trip time • What does a ping send to a destination? • Echo request • Speed of a T1 & T3? • T1= 1.5Mbps • T3= 44Mbps • Which Tier ISP forms the Internet backbone? • 1

  24. Review • What interconnects the backbone? • IXP • Bandwidth is measured in what? • Bps (bits per second) • What is a document that tracks the development of Internet standards? • RFC • In what year did the Internet become widely available to consumers? • 1991

  25. Review

  26. 1: Internet & Its Uses Working at a Small-Medium Business or ISP

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