Working at a Small-Medium Business or ISP 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 New standards developed, tracked & approved in RFC document Allows development of different devices to connect to Internet

Connect Me! You connect to ISP Remember the ISP services?

Which ISP?

ISPs

Internet Delivery 1 5MB File: Dialup=12min.; DSL=1min; ADSL; for SOHO

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

Metro Ethernet

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

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

Internet Hierarchy- IXP

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.

Sprint- Tier 1

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

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

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.

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

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

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

ISP Connectivity

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

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

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.

Activity

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

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

Review

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