Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 8)

Questions 36–40

1. 36expert · hard

   A consortium of banks is implementing a blockchain for cross-border payments. They need to finalize transactions quickly and ensure that no single bank can dominate the consensus process. They are considering using Raft consensus. What is the primary drawback of Raft in this context?

   • ARaft is not crash fault tolerant
   • BRaft has high energy consumption
   • CRaft requires proof-of-work to secure the network
   • DRaft relies on a leader, which can become a central point of control
   Reveal Solution Discussion Select an answer first
2. 37foundation · easy

   A group of banks wants to share a distributed ledger for interbank transfers, where only approved banks can validate transactions. Which blockchain type best fits this scenario?

   • ASovereign blockchain
   • BPublic blockchain
   • CConsortium blockchain
   • DPrivate blockchain
   Reveal Solution Discussion Select an answer first
4. 38foundation · easy

   Which blockchain type is typically permissioned and governed by a single organization, while still providing a distributed ledger to that organization's internal departments?

   • AHybrid blockchain
   • BPublic blockchain
   • CConsortium blockchain
   • DPrivate blockchain
   Reveal Solution Discussion Select an answer first
5. 39application · easy

   A private blockchain for a hospital network uses Proof of Authority. Which characteristic is a direct benefit of this consensus choice?

   • AThe network is resistant to 51% attacks by anonymous miners
   • BAnyone can become a validator by staking tokens
   • CTransactions are validated by a small set of known, pre-approved validators
   • DThe network can operate without any trusted parties
   Reveal Solution Discussion Select an answer first
6. 40foundation · easy

   Which statement correctly describes a key difference between Proof of Work (PoW) and Proof of Stake (PoS) consensus mechanisms?

   • APoW selects block proposers based on computational work, while PoS selects them based on the amount of cryptocurrency staked.
   • BPoW provides finality immediately, while PoS never achieves finality.
   • CPoW is used only in private blockchains, while PoS is used only in public blockchains.
   • DPoW requires no energy consumption, while PoS requires significant energy.
   Reveal Solution Discussion Select an answer first