Jan.19 th, 2007Seminar In Networks End-To-End Arguments in System Design Ayodele Onibokun Seminar In Networks Jan. 19 th, 2007

Seminar In Networks Introduction End-To-End Argument (E2E)  Sets of design principles  Helps in proper placement of functions  Placing functions at higher levels in a layered design  More closer to the application (especially in communication networks)

Jan.19 th, 2007Seminar In Networks Motivation?  Observations:  No new solutions  Existing trends and comment on further implications  Then AND Now  Current Internet Scenario  New and different application requirements

Jan.19 th, 2007Seminar In Networks  Which functions belong at which Layer? reliability, routing, encryption, compression, data conversion? - The End-to-End Argument

Jan.19 th, 2007Seminar In Networks Illustrated Examples  Careful File-Transfer (CFT)  Possible threats to CFT (independent of network communications)  Storage disk error / hardware fault  Buffer errors in FTP client  Soft error  Bit change (in packet transmission) The Argument: FTP Client should have built-in reliability 1.Operating System Error 2.Software Engineering Errors

Jan.19 th, 2007Seminar In Networks Illustrated Examples (Cont’d)  Delivery Guarantees  Acceptability & responsibility of message received The Argument: E2E ACK may still be a requirement  Secure transmission of data  e.g. Skype,  WEP, WPA  Router  IPSEC, PGP  Other Examples

Jan.19 th, 2007Seminar In Networks Critiques Advantages:  Ensures proper guidance in system design  Ensures proper placement of functions  Some of the arguments are convincing Disadvantages:  Different application requirements  Exponential growth of the Internet  Does not take into account technological advances

Jan.19 th, 2007Seminar In Networks Bottom-Line  Predicting future design concerns  Predicting technology progresses

Jan.19 th, 2007Seminar In Networks Discussion Comments