Blockchain Architecture and Platforms Questions and Answers

Question 1

A consortium of financial institutions wants to build a distributed ledger for trade finance.
Their primary requirements are strict data privacy where only parties involved in a transaction can view its details, and the absence of a volatile native cryptocurrency.
Which blockchain platform is architecturally designed around a 'need-to-know' data distribution model rather than a global broadcast channel?

Accepted Answer

Corda

Answer

Public Ethereum Mainnet

Answer

Hyperledger Fabric

Answer

Bitcoin

Question 2

In the architecture of Hyperledger Fabric, what is the specific and crucial role of the 'Ordering Service'?

Accepted Answer

To establish a total order of transactions and package them into blocks to be distributed to peers.

Answer

To execute smart contract logic (chaincode) and endorse transactions.

Answer

To maintain the world state database for a specific channel.

Answer

To issue and validate digital certificates for network participants.

Question 3

A public blockchain is struggling with high transaction fees and slow confirmation times due to network congestion. The development team decides to implement 'sharding' as a long-term scalability solution. What is the primary principle behind sharding?

Accepted Answer

Partitioning the network's state and transaction processing load across multiple parallel sub-chains.

Answer

Processing transactions on a separate, faster chain and later batching the results onto the main chain.

Answer

Increasing the block size limit to include more transactions in each block.

Answer

Requiring validators to stake more collateral to increase the economic security of the network.

Question 4

A development team needs to build a decentralized application (dApp) that can transfer a specific token from the Ethereum network to the Avalanche network without using a centralized intermediary. Which type of technology is specifically designed to facilitate this kind of cross-chain asset transfer and communication?

Accepted Answer

An interoperability protocol or cross-chain bridge

Answer

A blockchain oracle

Answer

A Layer-2 optimistic rollup

Answer

A state channel

Question 5

In the context of a modular blockchain architecture, such as the one Ethereum is migrating towards, which layer is primarily responsible for processing transactions, executing smart contract code, and managing changes to the blockchain's state?

Accepted Answer

Execution Layer

Answer

Consensus Layer

Answer

Data Availability Layer

Answer

Networking Layer

Question 6

Which of the following correctly pairs a blockchain platform with the common name for its smart contracts and the primary language(s) they are written in?

Accepted Answer

Hyperledger Fabric : Chaincode (Go, Java, Node.js)

Answer

Solana : Chaincode (Rust, C++)

Answer

Corda : Smart Contracts (Solidity)

Answer

Ethereum : Programs (Go, Java)