1. Chapter 13 - Internet: A Network Of Networks Introduction Network Technologies Are Incompatible Coping With Incompatibility –It is impractical, and may be economically infeasible, to require all computers in an enterprise to use the same network technology. Two Fundamental Concepts –A Connection to a Network can be Extended (dial-up modem connection, dedicated modem connection, digital connection) –A Computer Can Have Multiple Connections (multiple NICs)

2. Chapter 13 - Internet: A Network Of Networks Using A Computer To Interconnect Networks –Computers that interconnect networks are dedicated to the interconnection task. Although they use conventional hardware, they run special-purpose software that starts automatically when the system is powered on and remains operating at all times. Interconnecting Computers Pass Packets Interconnecting Computers Are Called Routers (Gateways) Routers Are The Building Blocks Of The Internet –The Internet is not a conventional computer network. It consists of thousands of computer networks interconnected by dedicated special-purpose compters called routers.

3. Chapter 13 - Internet: A Network Of Networks Routers Accommodate Multiple Types Of Networks Routers Can Interconnect WANs and LANs Interconnecting Networks Was Revolutionary Terms –fiber –network of networks –route –router –routing