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1: Internet & Its Uses

1: Internet & Its Uses. Working at a Small-Medium Business or ISP. What is the Internet?. 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. Standards. 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. What is the Internet?

  3. 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

  4. Standards

  5. Follow That Standard • New standards developed, tracked & approved in RFC document • Allows development of different devices to connect to Internet

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

  7. Which ISP?

  8. ISPs

  9. Internet Delivery 1

  10. Internet Delivery 2

  11. Metro Ethernet

  12. 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

  13. U to the I…to the S…to the P • You connect to the POP • POPs connect you to the ISP

  14. Internet Hierarchy- IXP

  15. Tier 1 ISP • AT&T, Sprint, Level 3 Communications • Top of hierarchy • They interconnect privately (PEERING) • Connect at IXP • Own the fiber cables for global comm.

  16. Sprint- Tier 1

  17. Tier 2 ISP • Regional/National ISPs • Connects to Tier 1 & with other Tier 2’s • Connects to IXP • Tier 2 pays Tier 1 for connectivity

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

  19. 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

  20. 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

  21. Review • Which Internet service would a medium/large business use? • Metro, T1, T3 • What can 2 things can you tell from a ping test? • Connectivity & how fast travels • What document tracks the development of standards? • RFC

  22. 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

  23. ISP Connectivity

  24. ISP Devices- Must Haves • 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

  25. 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

  26. ISP Roles & Responsibilities

  27. Activity

  28. 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

  29. 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

  30. Review

  31. 1: Internet & Its Uses Working at a Small-Medium Business or ISP

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