CSC458H1 Lecture 1: INTRO
Document Summary
Lec 1 - introduction: introduction to the mail system, goal: send a book uoft stanford, assume: book > 1 envelope. Solution: use admin break up work, send it, and reconstruct: mail system characteristics. Individually routed no guarantee of same path. No guarantee for time, sequence, or at all: need to ack delivery, handle lost packages. Resend after a timeout, give up after a limit. Always send ack when received something, even a duplicate. Signals connection still functional, no acks lost: ftp example using tcp/ip and ethernet, goal: transfer a file a b, go through all 20 step for any communication a b incl. Application-programming interface (api) in machine a app layer. Application on a req (transport layer for) tcp connection with b to transfer a file. Socket programming = application layer 1 transport layer language: 2. Transmission control protocol (tcp) in machine a transport layer. Tcp header = internal to tcp; type = connection setup.
