Virtual Labs

Distributed Consensus - Crash Failures Scenario

Which process must crash in order for consensus to take at least 2 rounds?

a: The process with the highest value/ID Explanation

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b: The process with the lowest value/ID Explanation

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c: A process chosen at random Explanation

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d: All processes except one Explanation

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When must the lowest value/ID process crash for consensus to take at least 2 rounds?

a: After it has broadcast its value in round 1 Explanation

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b: Before it broadcasts its value to all processes in round 1 Explanation

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c: At any point during the simulation Explanation

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d: Only after all processes reach consensus Explanation

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Which processes must crash in order for consensus to take at least 3 rounds?

a: Only the process with the highest value Explanation

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b: The process with the lowest value first, and processes with lowest value in next round Explanation

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c: All processes except two Explanation

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d: A random subset of processes Explanation

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When should the lowest value process crash to ensure consensus takes at least 3 rounds?

a: After it broadcasts its value to all processes Explanation

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b: Before it broadcasts its value to all processes Explanation

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c: At the end of the second round Explanation

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d: After all processes have completed communication Explanation

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When should processes crash in the second round, in order for consensus to take 3 rounds?

a: Processes with the lowest value, before they manage to send to all processes without the lowest value Explanation

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b: Any process can crash at any time to ensure consensus takes 3 rounds Explanation

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c: Processes with the highest value/ID, before they send to all processes Explanation

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d: One of the processes with the lowest value, before it sends to all processes without the lowest value Explanation

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