Blockchain Scaling Solutions BDC Practice Questions (Page 12)

Questions 56–60

1. 56foundation · easy

   How do optimistic rollups handle transaction validation?

   • AThey post all transaction data on-chain for immediate verification
   • BThey validate every transaction using zero-knowledge proofs
   • CThey assume transactions are valid by default and use fraud proofs to challenge invalid ones
   • DThey require every transaction to be approved by a central authority
   Reveal Solution Discussion Select an answer first
2. 57expert · hard

   A company wants to scale a payment system but has two conflicting requirements: (1) users must be able to transact with any other user without pre-funding a channel, and (2) the system must minimize trust in a third party. Which scaling solution best satisfies both?

   • AA state channel network with routing, because it allows users to transact without direct channels and settles on-chain.
   • BA sidechain with a federated consensus, because it allows any user to transact and reduces main-chain load.
   • CAn optimistic rollup, because it batches transactions and inherits main-chain security.
   • DA ZK-rollup, because it provides fast finality and strong security without requiring pre-funded channels.
   Reveal Solution Discussion Select an answer first
4. 58foundation · easy

   Which of the following is a Layer 2 scaling solution?

   • ASidechains
   • BIncreasing block size
   • CSharding
   • DConsensus protocol improvements
   Reveal Solution Discussion Select an answer first
5. 59foundation · easy

   What distinguishes Layer 2 solutions from Layer 1 solutions?

   • ALayer 2 solutions require a hard fork of the main chain
   • BLayer 2 solutions are only used for payments, not smart contracts
   • CLayer 2 solutions operate on top of the base chain without changing its protocol
   • DLayer 2 solutions replace the consensus mechanism of the main chain
   Reveal Solution Discussion Select an answer first
6. 60expert · hard

   A team is choosing between an optimistic rollup and a ZK-rollup for a payment application. The application requires fast withdrawals for users and the team has limited engineering resources to implement complex cryptographic systems. Which rollup should they choose, and what is the primary trade-off?

   • AZK-rollup, accepting higher complexity but providing immediate withdrawals.
   • BZK-rollup, because it is simpler to implement than an optimistic rollup.
   • COptimistic rollup, accepting a withdrawal delay due to the fraud-proof challenge period.
   • DOptimistic rollup, because it provides immediate withdrawals without a challenge period.
   Reveal Solution Discussion Select an answer first