Blockchain Scaling Solutions BDC Practice Questions (Page 8)

Questions 36–40

1. 36foundation · easy

   What is a fraud proof in the context of optimistic rollups?

   • AA mechanism to challenge and verify a suspicious batch of transactions
   • BA zero-knowledge proof that proves the validity of all transactions
   • CA consensus algorithm used to validate blocks
   • DA cryptographic signature that authorizes a transaction
   Reveal Solution Discussion Select an answer first
2. 37expert · hard

   A team is designing a micropayment system for IoT devices. Each device needs to make frequent small payments to multiple service providers. The team wants to minimize on-chain transactions and avoid the need for users to lock up funds in advance. Which scaling solution is most suitable, and what is the primary trade-off?

   • AAn optimistic rollup, but it has a challenge period that delays finality.
   • BA sidechain, but it requires trusting a federation or a separate consensus mechanism.
   • CState channels, but they require users to lock funds and are limited to a fixed set of participants.
   • DA ZK-rollup, but it requires complex cryptographic computation for each batch.
   Reveal Solution Discussion Select an answer first
4. 38foundation · easy

   Which of the following is a characteristic of on-chain scaling solutions?

   • AThey require changes to the base protocol or consensus rules
   • BThey use cryptographic proofs to compress transaction data
   • CThey rely on a trusted third party to process transactions
   • DThey move transactions to a separate chain
   Reveal Solution Discussion Select an answer first
5. 39expert · hard

   A team is evaluating Plasma and a general sidechain for a decentralized application that requires high throughput and strong security guarantees. They are concerned about user funds being stolen if the child chain or sidechain is compromised. Which approach provides stronger security for user funds, and why?

   • AA sidechain, because it has its own consensus and does not rely on the main chain.
   • BA sidechain with a two-way peg, because it allows users to move assets back to the main chain at any time.
   • CPlasma, because it uses fraud proofs and allows users to exit to the main chain if the child chain misbehaves.
   • DBoth provide equal security because they are both Layer 2 solutions.
   Reveal Solution Discussion Select an answer first
6. 40application · medium

   A consortium blockchain processes about 2,000 transactions per second during peak hours, but the current single-chain design caps throughput at 500 TPS. The consortium wants to increase capacity without changing the client software that members use to interact with the chain. Which Layer 1 approach best meets this requirement?

   • AIntroduce a sidechain that handles high-volume transactions and periodically commits checkpoints to the main chain.
   • BDeploy a state channel network that allows members to transact off-chain and settle only final balances on the main chain.
   • CImplement sharding to partition the network into multiple parallel shards, each processing its own subset of transactions.
   • DSwitch to a delegated proof-of-stake consensus algorithm that reduces block time from 5 seconds to 1 second.
   Reveal Solution Discussion Select an answer first