Choosing the Right Consensus for Blockchain Systems BFC Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   When selecting a consensus mechanism for a new blockchain system, which set of criteria is most commonly evaluated to guide the choice?

   • ASecurity, scalability, decentralization, energy efficiency, and finality
   • BProgramming language, API availability, and developer community size
   • CHash rate, block size, transaction fees, and node count
   • DRegulatory jurisdiction, token price, and marketing strategy
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A regulatory body requires that all transactions on a blockchain be final and irreversible within 10 seconds. Which consensus mechanism would satisfy this requirement?

   • AProof of Work (PoW)
   • BPractical Byzantine Fault Tolerance (PBFT)
   • CProof of Stake (PoS)
   • DDelegated Proof of Stake (DPoS)
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A fintech company is implementing a permissioned blockchain for trade finance. They expect to start with 10 nodes and grow to 100 nodes over time. They need a consensus mechanism that can handle increasing network size without a quadratic increase in communication overhead. Which mechanism should they choose?

   • ARaft
   • BProof of Work (PoW)
   • CDelegated Proof of Stake (DPoS)
   • DPractical Byzantine Fault Tolerance (PBFT)
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A blockchain startup is choosing between PoW and PoS for a new cryptocurrency. They want to minimize the risk of a 51% attack and also reduce energy consumption. Which consensus mechanism should they choose?

   • APoS, because it makes 51% attacks more expensive and is energy-efficient
   • BPoW, because it is more decentralized
   • CPoS, because it provides immediate finality
   • DPoW, because it is more secure against 51% attacks
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   Which of the following is a direct impact of consensus mechanism choice on a financial system's regulatory compliance?

   • AIt directly sets the interest rates for loans.
   • BIt influences the ability to enforce know-your-customer (KYC) and anti-money-laundering (AML) rules through permissioned participation.
   • CIt guarantees that all transactions are tax-exempt.
   • DIt determines the color of the user interface.
   Reveal Solution Discussion Select an answer first