Introduction To Networks Using Linux

NAD710

Professor: Tom Mavroidis

The Internet

• Never has there been such dramatic changes to the business world as we have seen in the 1990’s with e-business and the internet.

• The role played by internet has forced companies to get connected to stay relevant so they may compete in today's fast moving markets.

TCP-IP and The Internet Model

• In the 60’s and 70’s there were many different networks, protocols and implementations.

• Sharing of information among these dissimilar networks soon became a problem.

• A common protocol needed to be developed.

DARPA

• The Defense Advanced Research Projects Agency funded the exploration of this common protocol.

• The TCP/IP protocol suite evolved from the ARPANET protocol suite where the fundamental concept of layering was introduced.

Backbone Protocol

• TCP/IP became the backbone protocol of multivendor networks such as ARPANET, NFSNET and other regional networks.

Historical Maps of ARPANET

• Paul Baran in the 1960s envisioned a communications network that would survive a major enemy attacked. The sketch shows three different network topologies described in his RAND Memorandum, "On Distributed Communications: 1. Introduction to Distributed Communications Network" (August 1964). The distributed network structured offered the best survivability.

• On the battlefield a communications network will sustain damage, so the DOD designed TCP/IP to be robust and automatically recover from any node or phone line failure

University of California at Berkeley

• The protocol suite became popularized when it was integrated into the University of California at Berkeley’s UNIX operating system and became available to the public at a nominal fee.

                                                                                                                                                                    

TCP/IP

• TCP/IP provides the ability to merge different physical networks using a common suite of functions and interoperability between equipment.

OSI Open Systems Interconnect