1. Platforms, Stations and Trains A Transportation Look at the Internet

2. The Internet is a Vast Rail Road Each node is like a train station Some are the “end of the line” Some nodes are “along the line” Some are transfer points

3. Or a Set of Rail Roads

4. But from the Passenger’s Viewpoint, it’s Just Transportation I’m here I want to visit my sister I don’t even care about the route I take, except insofar as it affects my comfort and enjoyment!

5. Every Passenger has a Different “View” of the Rail Road I need a head gasket for my Edsel From this old parts dealer here

6. Some Very Strange We’re Switching Houses for a Week!

7. The Goal is Trains-parency A set of users can access whatever services are available on the rail road = Internet without worrying about what is actually happening. Their service doesn’t depend too much on what is physically happening to the rail road I’m sending some recent holiday photos to a friend Be anywhere, anytime, doing anything

8. The Internet is a Vast Service Environment Information -based

9. The Internet is a Vast Service Environment I want to sell my car. Strike Committee Meeting at 7 pm!! Does she love me? I’ll send a card. OK, folks, let’s see what this sucker can do!! So long as the services can be implemented as the movement of information