- What are the main purposes of reactive design patterns?
 - What are the four characteristics of reactive design patterns?
 - Which design pattern allows the client to send multiple request messages to the server and not dedicate processing resources and anticipate a response message from the server?
 - What are the two types of autoscaling relevant to the autoscaling design pattern?
 - What type of queues have a fixed number of elements ?
 - Which design pattern uses open, closed, and half-open states?
 - Which design pattern includes failure isolation?
 - Which design pattern includes elements whose value remains unchanged after repeated calculation?
 - Which design pattern is event-based and relies on subscribers?
 - Which design pattern employs self-sufficiency?
 
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