CBSA Blockchain Scalability & Performance 3

Question 1

What does 'latency' measure in blockchain performance metrics?

Accepted Answer

The time delay between when a transaction is submitted and when it receives on-chain confirmation

Answer

The time required for a new node to download and sync the entire blockchain

Answer

The computational delay incurred when mining or forging a new block

Answer

The propagation time for a newly discovered node to spread across the peer network

Question 2

Which off-chain data storage solution is most commonly paired with blockchains to handle large files while keeping storage costs low?

Accepted Answer

IPFS (InterPlanetary File System)

Answer

Redis in-memory cache

Answer

MySQL relational database

Answer

Apache Kafka event stream

Question 3

What is the defining architectural characteristic of a 'sidechain'?

Accepted Answer

It is an independent blockchain running parallel to the main chain with its own consensus, connected via a two-way peg

Answer

It archives historical transactions pruned from the main chain

Answer

It is a secondary validation layer that co-signs main-chain blocks

Answer

It is a privacy fork of the main chain with confidential transactions

Question 4

What does Ethereum's full 'danksharding' proposal aim to achieve?

Accepted Answer

Provide massively increased data availability for rollups through full sharding with data availability sampling

Answer

Replace proof-of-stake with a more energy-efficient consensus mechanism

Answer

Enable native cross-chain communication between Ethereum and other Layer 1 blockchains

Answer

Improve smart contract execution speed through parallel EVM processing across validators

Question 5

How does the CAP theorem apply to blockchain system design?

Accepted Answer

It establishes that distributed systems like blockchains can reliably guarantee only two of three properties: Consistency, Availability, and Partition tolerance

Answer

It proves that blockchains can always achieve Consistency, Availability, and Partition tolerance simultaneously

Answer

It defines the maximum cryptographic security achievable in a content-addressable network

Answer

It specifies the theoretical maximum block capacity for a given peer-to-peer topology

Question 6

What problem does 'data availability sampling (DAS)' solve in blockchain scalability?

Accepted Answer

It enables light nodes to verify that full block data is available by randomly sampling small data chunks without downloading the entire block

Answer

It guarantees smart contract state data is permanently retrievable by any node at any time

Answer

It compresses raw transaction data before inclusion in a block to reduce block size

Answer

It synchronizes shared state data across multiple parallel sidechains in real time

Question 7

Which statement best describes Ethereum's 'rollup-centric roadmap' for long-term scalability?

Accepted Answer

Layer 2 rollups serve as the primary execution layer while Ethereum Layer 1 acts as a secure settlement and data availability layer

Answer

All computation and storage will be moved onto Layer 1 to maximize on-chain throughput

Answer

Ethereum Layer 1 will be replaced entirely by a new chain optimized for rollup processing

Answer

Every dApp must deploy its own custom rollup contract directly on Ethereum mainnet