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Working at a Small-Medium Business or ISP

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Presentation on theme: "Working at a Small-Medium Business or ISP"— Presentation transcript:

1 Working at a Small-Medium Business or ISP
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 5MB File: Dialup=12min.; DSL=1min; ADSL; for SOHO

10 Internet Delivery 2 5MB File: Dialup=12min.; DSL=1min; For Medium to Large Businesses

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 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 (

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 Ping sends ICMP echo request & reply to show connectivity & speed/time.

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? What connects the backbones?
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 Plus power conditioning & air conditioning

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

26 ISP Roles & Responsibilities
Customer Service receives the order from the customer and ensures that the customer's specified requirements are accurately entered into the order tracking database. Planning and Provisioning determines whether the new customer has existing network hardware and circuits or whether new circuits need to be installed. The On-site Installation is advised of which circuits and equipment to use and then installs them at the customer site. The Network Operations Center (NOC) monitors and tests the new connection and ensures that it is performing properly. The Help Desk is notified by the NOC when the circuit is ready for operation and then contacts the customer to guide them through the process of setting up passwords and other necessary account information.

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? Bandwidth is measured in what?
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 Working at a Small-Medium Business or ISP
1: Internet & Its Uses Working at a Small-Medium Business or ISP

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