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

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Presentation on theme: "1: Internet & Its Uses Working at a Small-Medium Business or ISP."— Presentation transcript:

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


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?


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 addresses to Fisher Realty –What if 2 years from now Fisher Realty has an office with 12 employees & now needs a web presence? Switching ISPs 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 2s –Connects to IXP –Tier 2 pays Tier 1 for connectivity

18 Tier 3 ISP Connects to Tier 2 Local mom & pop ISP (

19 Ping & Tracert Ping- connectivity test (echo request) –Time it takes to travel –Whether its 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 ISPs to form the backbone? –1–1 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


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

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? –1–1

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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