CBSA Blockchain Scalability & Performance

Question 1

What is the primary purpose of a Layer 2 scaling solution in blockchain?

Accepted Answer

To process transactions off the main chain while inheriting its security

Answer

To replace the main blockchain with a faster alternative chain

Answer

To increase the block size limit of the main chain

Answer

To reduce the number of validator nodes in the network

Question 2

Which scaling technique divides a blockchain network into smaller groups of nodes, each responsible for processing a subset of transactions?

Accepted Answer

Sharding

Answer

Sidechains

Answer

Plasma chains

Answer

State channels

Question 3

What is a 'state channel' in the context of blockchain scaling?

Accepted Answer

An off-chain communication channel where participants exchange signed transactions privately and settle on-chain only at the end

Answer

A dedicated server for handling high-value transactions

Answer

A special smart contract pattern for batching token transfers

Answer

A cryptographic bridge between two different blockchains

Question 4

Bitcoin's Lightning Network is an example of which Layer 2 scaling category?

Accepted Answer

Payment/State channel network

Answer

Plasma framework

Answer

ZK-Rollup

Answer

Sidechain

Question 5

Which metric is most commonly used to measure and compare blockchain transaction throughput?

Accepted Answer

Transactions per second (TPS)

Answer

Block reward rate (BRR)

Answer

Node synchronization time (NST)

Answer

Hash difficulty target

Question 6

What is an 'Optimistic Rollup' in Layer 2 blockchain scaling?

Accepted Answer

A Layer 2 solution that batches off-chain transactions and assumes their validity, relying on fraud proofs during a challenge window

Answer

A rollup that assumes all transactions are invalid until cryptographically proven otherwise

Answer

A consensus mechanism designed for faster block production on Layer 1

Answer

A sharding approach that optimistically pre-assigns validators to shards

Question 7

What does the 'blockchain trilemma' (as described by Vitalik Buterin) refer to?

Accepted Answer

The inherent difficulty of simultaneously achieving decentralization, security, and scalability in a blockchain

Answer

The three types of consensus: Proof of Work, Proof of Stake, and Delegated Proof of Stake

Answer

The three architectural layers: data, network, and consensus

Answer

The challenge of integrating blockchain with three categories of legacy enterprise systems