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If you are interested in iOS app development and you are a beginner like me, I can heartily recommend these resources:

Hacking with swift, Swift 3 for absolute beginners (free)

The Complete iOS 10 Developer Course - Build 21 Apps  (paid)

Ray Wenderlich (free)

Q: How do clustered systems differ from multiprocessor systems? 
What is required for 2 machines belonging to a cluster to cooperate to provide a highly available service?
A: Clustered systems are typically constructed by combining multiple computers into a single system to perform a computational task distributed across the cluster.

Q: A password may become known to others in a variety of ways. Is there a simple method for detecting that such an event has occurred?