BIT 4554 Lecture Notes - Lecture 4: Application Server, Application Programming Interface, Web Server
2 Feb 2017
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Document Summary
The internet offers users a rich diversity of services (ftp, email, web service, etc. ) It is possible to devise new services without changing the internet. Each message delivered to a receiver corresponds to a message that was transmitted by a sender if a sender places exactly n bytes in an outgoing message, the receiver will find exactly n bytes in the incoming message. Unicast message sent from an application on one computer directly to an application on another, 1-to-1. Multicast message multicast to some of the computers on a network, 1-to-many. Broadcast message broadcast to all computers on a given network, 1-to-all. Message service does not make any guarantees, messages may be: To guarantee that a pair of applications on 2 different computers coordinate that they request a connection at the same time. Client sends/receives data and can terminate after the communication is complete. The way the functions of the application layer are spread out across the client and server.
