Blockchain Scaling Solutions BDC Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A blockchain network is considering sharding to improve scalability. The team is concerned about the security implications of splitting validators across shards. Which additional measure would best mitigate the risk of a single shard being compromised?

   • AReduce the number of shards to increase the number of validators per shard.
   • BUse a sidechain to handle cross-shard transactions.
   • CRandomly assign validators to shards and periodically reshuffle them.
   • DIncrease the block size on each shard to process more transactions.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   How does sharding improve blockchain scalability?

   • ABy increasing the block size to accommodate more transactions
   • BBy moving all transactions to a single high-performance server
   • CBy compressing transaction data using zero-knowledge proofs
   • DBy partitioning the blockchain into smaller shards that process transactions in parallel
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A blockchain startup is experiencing network congestion because the base layer can only process about 15 transactions per second. The team wants to increase throughput without moving transactions off-chain or introducing a secondary chain. Which approach directly addresses this requirement?

   • AIncrease the block size and adjust the block interval to allow more transactions per block.
   • BIntroduce a sidechain that settles periodically with the main chain.
   • CDeploy a state channel network to handle most transactions off-chain.
   • DAdopt a rollup that posts compressed transaction batches to the main chain.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A payment provider wants to enable instant, low-cost transactions between its customers without waiting for each transaction to be confirmed on the main blockchain. They are willing to use a network of payment channels and need a mechanism to resolve disputes if a customer tries to cheat. Which off-chain scaling approach fits this requirement?

   • AA Plasma child chain that uses fraud proofs for security.
   • BA sidechain that processes transactions and periodically commits checkpoints to the main chain.
   • CA state channel network where transactions are exchanged off-chain and only the final state is settled on-chain, with dispute resolution via channel contracts.
   • DAn optimistic rollup that batches transactions and posts them to the main chain.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A team is building a payment network that must support high throughput and allow users to transact with any other user without pre-funding a channel. They are considering a state channel network with routing and a sidechain. Which solution is more appropriate, and what is the primary trade-off?

   • AState channel network, but it requires users to lock funds in advance.
   • BSidechain, but it requires users to lock funds in advance.
   • CState channel network with routing, but it requires trust in routing nodes and may have liquidity constraints.
   • DSidechain, but it requires trust in the sidechain's validators and may have lower security.
   Reveal Solution Discussion Select an answer first