Table of Contents

I.Networks as They Might Have Been

1. A Marvelous Message Moving Marble MachineSending data with marbles

2. A Message Mover via Means of Electrical Egress, or We've Lost Our Marbles Replacing marbles with electric signals

3. There and Back Again...and Again and AgainTwo-way communication

4. Finally, Something that Looks Like a Computer! Sending more than just messages

5. The World Wide Web Has a Nicer Ring to It Than the Directed Data Graph of Doom (Coming soon!)

II.Networks as They Are

III.Networks as They May Be