Blockchain Consensus Mechanisms and Their Applications BBLC Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A permissioned blockchain network with 7 nodes is using PBFT. The network is experiencing performance degradation. The administrator suspects that some nodes are acting maliciously. How many nodes can fail (including malicious behavior) while the network continues to function correctly?

   • A4 nodes
   • B2 nodes
   • C1 node
   • D3 nodes
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A blockchain project is planning its token distribution. They want to maximize long-term network participation and avoid a situation where early investors dump their tokens. They also want to incentivize developers to contribute to the ecosystem. Which distribution strategy is most effective?

   • AAirdrop tokens to all users who sign up, regardless of activity
   • BSell all tokens in a public ICO with no vesting
   • CMine all tokens with no pre-mine and no treasury
   • DAllocate a portion to a community treasury with a multi-sig wallet and use it to fund grants, while vesting team tokens over 4 years
   Reveal Solution Discussion Select an answer first
4. 18expert · hard

   A cryptocurrency network is experiencing a gradual centralization of mining power, with a few large mining pools controlling over 60% of the total hash rate. The network's security is at risk because these pools could collude to execute a 51% attack. The community is debating solutions. Which approach is most likely to reduce centralization without compromising security?

   • AEncourage miners to join a single large pool to increase collective security
   • BSwitch to a Proof of Stake consensus mechanism
   • CImplement a change to the mining algorithm that is ASIC-resistant, encouraging GPU mining and making it easier for smaller miners to participate
   • DIncrease the block reward to attract more miners
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Compared to Proof of Work, what is a key efficiency advantage of Proof of Stake?

   • AIt eliminates the need for any network security measures
   • BIt requires significantly less energy because validators do not compete with computational work
   • CIt achieves instant finality with no delay in block confirmation
   • DIt allows anyone to become a validator without any capital requirement
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   How does game theory relate to blockchain consensus mechanisms?

   • AIt helps design incentives so that rational participants are motivated to act honestly
   • BIt guarantees that all participants will always act honestly
   • CIt ensures that the network is completely decentralized
   • DIt eliminates the need for cryptographic security
   Reveal Solution Discussion Select an answer first