Virtual Labs

Understanding Byzantine Failures in Distributed Systems

What is a distributed system?

a: A single computer with multiple cores. Explanation

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b: A collection of independent computers that appears as a single system. Explanation

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c: A network of computers in the same room. Explanation

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d: A system with a single point of failure. Explanation

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Which of the following is the most severe type of failure in a distributed system?

a: Crash failure Explanation

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b: Omission failure Explanation

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c: Timing failure Explanation

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d: Byzantine failure Explanation

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What is the main goal of the Byzantine Generals' Problem?

a: To win a battle. Explanation

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b: To achieve consensus among generals, some of whom may be traitors. Explanation

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c: To find the fastest communication path. Explanation

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d: To elect a single leader general. Explanation

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In the context of the Byzantine Generals' Problem, if there are 'n' generals and 't' traitors, what is the condition to guarantee a solution?

a: n > t Explanation

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b: n > 2t Explanation

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c: n > 3t Explanation

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d: n = 2t + 1 Explanation

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What is Byzantine Fault Tolerance (BFT)?

a: A system that is tolerant to all types of faults. Explanation

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b: A property of a system that allows it to tolerate Byzantine failures. Explanation

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c: A type of hardware that prevents Byzantine failures. Explanation

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d: A system that can only tolerate crash failures. Explanation

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Which of the following is a well-known BFT algorithm?

a: TCP/IP Explanation

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b: Paxos Explanation

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c: Practical Byzantine Fault Tolerance (PBFT) Explanation

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d: Raft Explanation

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In PBFT, how many identical replies must a client receive to accept a result, if there are 't' faulty nodes?

a: t Explanation

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b: t + 1 Explanation

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c: 2t Explanation

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d: 2t + 1 Explanation

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Why are Byzantine failures a major concern in blockchain technology?

a: Because blockchains are slow. Explanation

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b: Because some participants (miners/validators) may be malicious and try to cheat the system. Explanation

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c: Because blockchains use a lot of electricity. Explanation

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d: Because blockchains are centralized. Explanation

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What happens in a BFT system if the number of faulty nodes 't' is such that n <= 3t?

a: The system works faster. Explanation

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b: The system can no longer guarantee that it will reach a correct consensus. Explanation

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c: The system automatically adds more nodes. Explanation

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d: The system switches to a different algorithm. Explanation

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