Proof of Stake (PoS) and Derivative Protocols BDC Practice Questions (Page 8)

Questions 36–40

1. 36expert · hard

   A validator in a Proof of Stake network is considering whether to validate on two competing forks after a contentious upgrade. The network has slashing conditions that penalize validators who sign blocks on multiple forks. What is the most rational decision for the validator?

   • AChoose one fork and validate only on that chain to avoid slashing
   • BValidate on the fork with the higher reward rate
   • CStop validating until the fork resolves
   • DValidate on both forks to maximize rewards
   Reveal Solution Discussion Select an answer first
2. 37foundation · easy

   What is the 'nothing-at-stake' problem in Proof of Stake?

   • AValidators lose their stake if they produce blocks on the wrong fork
   • BValidators must constantly spend energy to maintain their stake
   • CValidators have no incentive to produce blocks because rewards are too low
   • DValidators can vote on multiple conflicting blockchain forks at no cost, potentially preventing consensus
   Reveal Solution Discussion Select an answer first
4. 38expert · hard

   A blockchain architect is choosing between Proof of Work and Proof of Stake for a public network that must be highly secure against 51% attacks. They have a budget for security but want to minimize ongoing operational costs. Which consideration is most important?

   • APoS is less secure because validators can be coerced more easily
   • BPoW is always more secure because it has been battle-tested for longer
   • CIn PoS, an attacker must acquire a large portion of the total staked supply, which is often more costly than renting hash power
   • DPoW is more secure because it requires physical hardware
   Reveal Solution Discussion Select an answer first
5. 39application · medium

   A project wants to distribute new tokens to users who have demonstrated long-term commitment to the network, rather than just those with the most tokens. Which PoS derivative is most suitable?

   • AProof of Importance (PoI)
   • BProof of Burn (PoB)
   • CLeased Proof of Stake (LPoS)
   • DProof of Authority (PoA)
   Reveal Solution Discussion Select an answer first
6. 40foundation · easy

   Compared to Proof of Work (PoW), what is a key difference in how Proof of Stake (PoS) secures the network?

   • APoS is centralized by design, while PoW is decentralized
   • BPoS relies on physical hardware distribution, while PoW relies on token distribution
   • CPoS requires validators to solve cryptographic puzzles, while PoW does not
   • DPoS relies on economic penalties (slashing) to deter attacks, while PoW relies on the cost of computational work
   Reveal Solution Discussion Select an answer first