1. MIS 5241 Chapter 5 Understanding Internetworking Infrastructure

2. MIS 5242 AGENDA  The Network Technology Bandwagon  The Components of Internetworking  Networks  Processing Systems  Facilities  Business Implications  The Future

3. MIS 5243 The Network Technology Bandwagon  Technology “Laws”  Evolution of Topologies and Technologies  Bandwidth “Explosion”

4. MIS 5244 Two “Laws”  Moore’s Law  The performance of chips doubles every 18 to 24 months.  Metcalfe’s Law  The usefulness (“utility”? “value”?) of a network increases with the square of the number of users connected

5. MIS 5245 Commentary on Moore’s Law  A law of commerce  What would make Moore’s Law behave differently (12 months? 120 months?)?  Why does Moore’s Law function the way it does?  Why doesn’t Moore’s Law apply to other elements of our business culture?

6. MIS 5246 Commentary on Metcalfe’s Law  This is an analytic truth, if connection is usefulness  Obviously an absurdity  What makes Metcalfe’s Law “true”? What would make it false?

7. MIS 5247 Metcalfe’s Law “Proven” Each existing user gains access to a new user: gain=1xN New user gains access to each existing user: gain=N x 1 Total gain =2 x N By induction, cumulative “value” = 2+4+6+8+… = 2x(1+2+3+4…)= K x (K+1) ~ K x K for K users

8. MIS 5248 Commentary on Both Laws  The cost of providing the network is dropping exponentially  The benefit of using networks seems to be increasing somehow (square?)  The benefit/cost ratio seems to be increasing hyperexponentially, hence the sky’s the limit.

9. MIS 5249 Evolution of Corporate IT Infrastructure Centralized Computing Distributed Computing Client-Server Computing INTER- NET Internetworked Computing

10. MIS 52410 Network Elements  Local Area Networks  Hubs, Switches, Network Adapters  Wide Area Networks  Routers  Firewalls  Caching, other Devices

11. MIS 52411 Processing Elements  Client Devices and Systems  Server Devices and Systems  Mainframe Devices and Systems  Middleware  Infrastructure Management Systems  Business Applications

12. MIS 52412 Facility Elements  Buildings  Physical Spaces  Network Conduits and Connections  Power  Environmental Controls  Security

13. MIS 52413 Characteristics of Internetworks  Open Standards  Asynchronous Operationi  Latency (It takes Time)  Decentralization  Scalability

14. MIS 52414 Business Implications  Real-time Infrastructures  Better Data and Decisions  Improved Process Visibility  Improved Process Efficiency  Make-and-Sell to Sense-and-Respond  New Threats  New Models of Service Delivery  Need to Manage Legacies

15. MIS 52415 The Future?