CBSA Blockchain Scalability & Performance 2

Question 1

What is the key difference between a ZK-Rollup and an Optimistic Rollup?

Accepted Answer

ZK-Rollups use zero-knowledge validity proofs for instant finality; Optimistic Rollups use fraud proofs with a challenge period

Answer

ZK-Rollups are faster but inherently less secure than Optimistic Rollups

Answer

ZK-Rollups operate entirely on sidechains while Optimistic Rollups are Layer 1 solutions

Answer

ZK-Rollups only support simple token transfers and cannot execute smart contracts

Question 2

In the context of Ethereum scaling, what is 'Plasma'?

Accepted Answer

A Layer 2 framework for creating child chains that periodically commit compressed state roots to the Ethereum main chain

Answer

A proof-of-stake consensus mechanism designed for high throughput

Answer

A privacy protocol that hides transaction amounts using range proofs

Answer

A standardized cross-chain asset bridge protocol

Question 3

What is the primary scalability trade-off when simply increasing blockchain block size?

Accepted Answer

Higher hardware requirements for running full nodes raise centralization risk

Answer

Transaction fees increase proportionally to block size

Answer

Larger blocks slow down the consensus mechanism significantly

Answer

Smart contract functionality is reduced to compensate for larger data

Question 4

Which technology category enables separate blockchain networks to transfer tokens and arbitrary data with each other?

Accepted Answer

Cross-chain interoperability protocols (e.g., Polkadot, Cosmos IBC)

Answer

Intra-chain sharding protocols

Answer

Bidirectional state channels

Answer

Block pruning and archival nodes

Question 5

In blockchain performance, what does 'finality' mean?

Accepted Answer

The guarantee that a confirmed transaction is irreversible and permanently recorded on the blockchain

Answer

The process of closing a payment channel and settling funds on-chain

Answer

The final block produced in a blockchain's lifecycle

Answer

The maximum transaction count permitted per block

Question 6

What is the purpose of EIP-4844 (Proto-Danksharding) in Ethereum's scaling roadmap?

Accepted Answer

To introduce blob-carrying transactions that allow Layer 2 rollups to post data to Ethereum at significantly lower cost

Answer

To replace Ethereum's proof-of-work with a faster consensus algorithm

Answer

To enable native cross-chain messaging between Ethereum and Polkadot

Answer

To improve smart contract execution by supporting parallel transaction processing

Question 7

What does 'throughput' specifically measure in a blockchain performance context?

Accepted Answer

The volume of transactions the network can process per unit of time

Answer

The total cryptocurrency rewards distributed per block

Answer

The byte size of each individual transaction

Answer

The total count of full nodes participating in the network