Client / Server Computing

Client / Server Computing What is C/S computing?  McDonald’s  Restaurant  FTP  PGP Keys  Print  and the list goes on … 

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CS 428 Computer Networks

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Client / Server Client

Server

Where are they located ? • Networks • Anywhere else? © MMII JW Ryder

CS 428 Computer Networks

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Client User Interface Format & Pack Data for Server

Unpack data from Server

Server Interface • Layered Application (Could TCP/IP be considered C/S in any way??) • Clients usually sit and wait in the Server Interface for a response from Server © MMII JW Ryder

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Server Client Interface Input/Output Decode Input Work Routine Interface • Wake up, receive input, decode input command, invoke proper high level work routine • Invoke means

• Interrupt driven interface (asynchronous) •Call / Return interface (sequential / synchronous) © MMII JW Ryder

CS 428 Computer Networks

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Server continued Draw totally synchronous  Draw variations of asynchronous 

 Queued

up input to server (or not)  Forked (spawned) Work Routines (or not)  Child

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Process interrupt driven I/O management

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Internet Information Server 

Show 'Random Thought Generator'

© MMII JW Ryder

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