States: Review
  
  Answer these questions to review the webpage on States.
  
  A distributed system consists of a set of agents and a set of
  channels.
  
    - 
    What is the state of a distributed system?
    
 
    - 
    
 - 
    When does the state of a distributed system change?
    
 
    - 
    Consider an example in which an agent sleeps for some time when it
    processes a message. Does the amount of time that the agent sleeps
    change the state transitions of the system?
    
 
    - 
    When does the state of an agent change?
    
 
    - 
    Describe how the state of a channel changes.
    
 
    - 
    What are the restrictions on a 
receive function of an
    agent? 
     
    - 
    The parameters of a 
receive function are the message
    that arrived and the sender of the message. Why is it helpful for
    the receiver to have information about the sender of the message?
     
  
    
 
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States of a Distributed System.
Frequenty Asked Questions
    
      K. Mani Chandy,
      Emeritus Simon Ramo Professor,
      California Institute of Technology