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distributed system comparison table

Subject	use	divide up into	have specification	have problem	involve	be	exist	has part	is a subtopic of	incorporate	have interaction	is a kind of	have scope
client-server system	multiple threads of control that can be concurrently executed to implement concurrent operations, otherwise when the client is waiting for one kind of input, it will not be able to respond to the other kind of input	clients and servers	which is then implemented by a collection of components	developers of clients are frequently forced to upgrade their clients whenever the server is changed if clients and servers are developed by different organizations	at least one server and one client	forward-compatible and backward-compatible with other versions of clients and servers by designing the client-server protocols to be very general and flexible	even if its components change over the course of time, or are replaced by equivalent components	subsystem	3.4 - The Client-Server Architecture	encryption, firewalls and similar methods of ensuring security	The server starts running The server listens for clients wanting to connect Clients start running and perform various operations, some of which require connecting to the server to request a service When a client attempts to connect, the server accepts the connection if it is willing The server waits for messages to arrive from connected clients When a message from a client arrives, the server takes some action in response, such as sending a message back to the client, then resumes waiting Clients and servers continue functioning in this manner until one of them decides to shut down	distributed system

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