Choosing the Right Consensus for Blockchain Systems BFC Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A consortium of 30 banks wants to deploy a blockchain for cross-border payments. They need high throughput (thousands of transactions per second), low latency, and the ability to revoke a validator that misbehaves. Which consensus mechanism best fits these requirements?

   • AProof of Stake (PoS)
   • BDelegated Proof of Stake (DPoS)
   • CProof of Authority (PoA)
   • DProof of Work (PoW)
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A fintech company is deploying a permissioned blockchain with PBFT for a payment system. They anticipate that the number of participating nodes will grow from 10 to 100 over the next year. What is the most important implementation consideration to address?

   • AThe need to switch to PoW to handle the larger network
   • BThe need to reduce the number of validators to maintain performance
   • CThe increase in communication overhead as the number of validators grows
   • DThe need to increase block size to accommodate more transactions
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A retail loyalty program wants to use a blockchain to issue and redeem points across multiple merchants. They need high transaction throughput, low transaction fees, and the ability to handle occasional disputes by reversing transactions. Which consensus mechanism is most appropriate?

   • AProof of Work (PoW)
   • BPractical Byzantine Fault Tolerance (PBFT)
   • CDelegated Proof of Stake (DPoS)
   • DProof of Stake (PoS)
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A central bank is developing a central bank digital currency (CBDC) for retail payments. They need a system that can handle millions of transactions per day, be energy-efficient, and allow the central bank to maintain oversight. Which consensus mechanism is most suitable?

   • AProof of Authority (PoA)
   • BProof of Work (PoW)
   • CDelegated Proof of Stake (DPoS)
   • DProof of Stake (PoS)
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   In comparing Proof of Work (PoW) and Proof of Stake (PoS), which trade-off is most accurate?

   • APoW achieves faster finality than PoS, but PoS has higher transaction throughput.
   • BPoW provides higher energy efficiency but lower security compared to PoS.
   • CPoW is more resistant to 51% attacks than PoS, but PoS is easier to upgrade.
   • DPoW offers stronger decentralization but consumes more energy, while PoS is more energy-efficient but may concentrate power among large stakeholders.
   Reveal Solution Discussion Select an answer first