Choosing the Right Consensus for Blockchain Systems BFC Practice Questions (Page 6)

Questions 26–30

1. 26expert · hard

   A consortium of 15 banks is building a blockchain for real-time gross settlement (RTGS). They require immediate finality and high throughput. They are considering PBFT and a BFT-based PoS. Which consensus mechanism is more appropriate?

   • ABFT-based PoS, because it is more scalable
   • BBFT-based PoS, because it provides immediate finality
   • CPBFT, because it is more energy-efficient
   • DPBFT, because it provides immediate finality and is designed for small permissioned networks
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   A supply chain consortium wants to track goods across multiple countries. They need a public blockchain for transparency but also need to comply with GDPR's right to be forgotten. Which consensus mechanism would be most appropriate?

   • AProof of Work (PoW)
   • BPermissioned blockchain with PBFT
   • CProof of Stake (PoS)
   • DDelegated Proof of Stake (DPoS)
   Reveal Solution Discussion Select an answer first
4. 28foundation · easy

   Which implementation consideration is crucial for ensuring that a blockchain network can adapt to future changes in its consensus mechanism?

   • AHaving a governance process and upgrade path for protocol changes
   • BEnsuring all nodes have identical hardware specifications
   • CUsing a fixed block size to prevent any changes
   • DMinimizing the number of nodes to reduce upgrade complexity
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   How does the choice of consensus mechanism affect transaction latency in a financial system?

   • APoW always has lower latency than any other mechanism because it uses more computational power.
   • BIt has no effect on latency because latency is determined solely by network bandwidth.
   • CMechanisms with immediate finality, like PBFT, typically offer lower latency than probabilistic mechanisms like PoW.
   • DLatency is only affected by the number of nodes, not by the consensus mechanism.
   Reveal Solution Discussion Select an answer first
6. 30foundation · easy

   When deploying a consensus mechanism, which factor is most important to consider regarding the network size?

   • AThe number of nodes affects communication overhead and scalability; some mechanisms scale poorly with many nodes.
   • BLarger networks always have lower latency regardless of the consensus mechanism.
   • CNetwork size only affects the storage capacity, not the consensus process.
   • DNetwork size is irrelevant because consensus is only performed by a single node.
   Reveal Solution Discussion Select an answer first