Consensus and Scalability Innovations BDC Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A blockchain startup is evaluating future scalability innovations. They want to achieve high throughput without compromising security or decentralization. They are considering a combination of sharding and a Layer 2 solution. What is a key challenge they must address?

   • ACoordinating Layer 2 solutions across multiple shards to ensure consistent state.
   • BUsing a single shard for all Layer 2 solutions to simplify coordination.
   • CSwitching to a DAG-based structure to avoid the need for sharding.
   • DEliminating the need for a consensus mechanism entirely.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A research team is exploring ways to scale a public blockchain without compromising decentralization. They are considering combining multiple techniques. Which combination is most aligned with current innovations?

   • AReplacing the base layer with a single high-performance validator to maximize throughput.
   • BAdopting a DAG structure but keeping a single block producer for ordering.
   • CUsing only state channels for all transactions, with no base-layer changes.
   • DSharding the base layer and using rollups for application-specific throughput.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   Which of the following is an example of a Layer 2 scaling solution?

   • ASharding
   • BProof of Work
   • CDelegated Proof of Stake
   • DState channels
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   How does Delegated Proof of Stake (DPoS) improve scalability compared to Proof of Work?

   • ABy reducing the number of nodes involved in block production
   • BBy using sharding to parallelize transaction processing
   • CBy increasing the block size limit
   • DBy eliminating the need for transaction fees
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   A decentralized finance (DeFi) platform wants to allow users to move assets between a high-throughput sidechain and the main Ethereum network. They need to ensure that assets are not double-spent and that the transfer is secure. Which approach is most appropriate?

   • AUse a two-way peg with a smart contract on the main chain that locks assets and mints equivalent tokens on the sidechain.
   • BUse a simple bridge that trusts a single validator to move assets between the chains.
   • CUse a DAG-based consensus on the sidechain to automatically synchronize with the main chain.
   • DUse a state channel that spans both chains to transfer assets.
   Reveal Solution Discussion Select an answer first