A gaming company wants to let players make thousands of micro-transactions per day with minimal fees and near-instant finality. They are willing to lock funds in a smart contract and require that only the two players in a match can transact with each other. Which scaling solution best fits these requirements?

Public sidechain that processes all player transactions and periodically commits checkpoints to the main chain.

Optimistic rollup that batches all micro-transactions into a single on-chain transaction.

State channel between the two players, with only the final balance settled on-chain.

Increase the main chain block size to accommodate all micro-transactions directly.

What is a key characteristic of sharding?

Each shard maintains its own state and processes its own transactions

Transactions are processed sequentially in a single queue

All nodes must store the entire blockchain state

It requires a trusted third party to coordinate shards

What is a common trade-off when using off-chain scaling solutions?

They require changes to the main chain's consensus

They may introduce additional trust assumptions or reduce security compared to the main chain

They always increase decentralization

They eliminate all transaction fees

A blockchain network is considering sharding to improve scalability, but the team is worried about the impact on decentralization because each shard may have fewer validators. Which approach best mitigates this concern while still benefiting from sharding?

Increase the block size on each shard to compensate for fewer validators.

Use a sidechain to handle transactions from shards with fewer validators.

Reduce the number of shards to increase the number of validators per shard.

Use a large number of validators per shard and randomly rotate them to prevent concentration of power.

How do ZK-rollups achieve scalability?

By compressing many transactions into a single proof that is verified on-chain

By moving all transactions to a sidechain

By using a faster consensus algorithm

By increasing the block size of the main chain

EC-CouncilBlockchain Developer Certification

Domain 1Objective 7

Blockchain Scaling Solutions BDC Practice Questions (Page 1)

Part of the Blockchain Fundamentals and Architecture domain, which makes up ~14% of our current practice bank.

62questions here

13free pages

13concepts

Questions 1–5

1application · medium
A gaming company wants to let players make thousands of micro-transactions per day with minimal fees and near-instant finality. They are willing to lock funds in a smart contract and require that only the two players in a match can transact with each other. Which scaling solution best fits these requirements?
Select an answer first
2foundation · easy
What is a key characteristic of sharding?
Select an answer first
3foundation · easy
What is a common trade-off when using off-chain scaling solutions?
Select an answer first
4expert · hard
A blockchain network is considering sharding to improve scalability, but the team is worried about the impact on decentralization because each shard may have fewer validators. Which approach best mitigates this concern while still benefiting from sharding?
Select an answer first
5foundation · easy
How do ZK-rollups achieve scalability?
Select an answer first

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