1. Network Programming Eddie Aronovich mail: eddiea@cs.tau.ac.il

2. How did it started ?

3. How can we write communication ? 4 Application Program Interface (API) –Sockets –TLI (Transport Layer Interface) 4 System calls 4 Library functions

4. What is it for ? Communication systems provides 3 services: –Information & resource Sharing –Distance gapping –Backup abilities

5. Fundamentals 4 Server - An entity which gives services 4 Client - An entity which requests services 4 Transport layer - To transfer the data

6. The 7 layers model

7. The 7 Layer model in real life

8. The message is built in one side...

9. And striped in the dest. side…

10. From Lynx to Netscape or chat client Presentation

12. Descriptors 4 Everything in Unix is a file 4 Descriptor is an index into an array

13. Memory Buffers 4 Contains Socket Address Structure 4 Headers 4 Data