Blockchain Scaling Solutions BDC Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A development team is building a decentralized exchange and wants to reduce gas costs by batching many token transfers into a single on-chain transaction. They prefer a solution that does not require complex cryptographic computations for every batch and are willing to accept a challenge period for dispute resolution. Which rollup approach should they choose?

   • AZK-rollup, which generates a zero-knowledge proof for each batch to validate all transactions.
   • BA sidechain that processes transfers and periodically commits checkpoints to the main chain.
   • CA state channel that allows users to transact off-chain and settle final balances on-chain.
   • DOptimistic rollup, which assumes transactions are valid and relies on fraud proofs to catch invalid state transitions.
   Reveal Solution Discussion Select an answer first
2. 42expert · hard

   A blockchain platform must scale to 10,000 TPS while preserving strong decentralization (many independent validators) and high security against malicious state transitions. The team is evaluating sharding, optimistic rollups, and ZK-rollups. Which solution best balances these three goals?

   • AOptimistic rollups, because they are simple and have high throughput without requiring complex proofs.
   • BSharding, because it increases throughput by parallelizing and maintains decentralization by distributing validators across shards.
   • CZK-rollups, because they provide cryptographic validity and high throughput while keeping the main chain relatively simple and decentralized.
   • DA sidechain with a delegated proof-of-stake consensus, because it can process transactions quickly and independently.
   Reveal Solution Discussion Select an answer first
4. 43foundation · easy

   Which of the following is an off-chain scaling technique?

   • AReducing block time
   • BIncreasing block gas limit
   • CSharding
   • DState channels
   Reveal Solution Discussion Select an answer first
5. 44foundation · easy

   What is the primary reason blockchain networks have limited transaction throughput compared to traditional payment systems?

   • AThe lack of a global standard for transaction formats
   • BThe need for decentralized consensus among many nodes
   • CThe use of asymmetric cryptography for digital signatures
   • DThe requirement to store all data in a centralized database
   Reveal Solution Discussion Select an answer first
6. 45application · medium

   Two parties want to exchange a large number of small payments between themselves over a short period. They want to avoid paying a transaction fee for every payment and are willing to lock funds in a smart contract. Which solution should they use?

   • AState channel
   • BSidechain
   • CSharding
   • DZK-rollup
   Reveal Solution Discussion Select an answer first