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

Corda is uniquely designed for use cases requiring high privacy. Unlike platforms that use broadcast channels (even private ones like in Fabric), Corda communicates transactions on a point-to-point, 'need-to-know' basis. Only the parties involved in a transaction, and optionally a Notary service, receive the data, making it ideal for the described financial scenario.

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

The Ordering Service is a fundamental component of Hyperledger Fabric's architecture. Its primary responsibility is to receive endorsed transactions from clients, establish a consensus on the final and correct order of these transactions, and then package them into blocks. These blocks are then broadcast to the committing peers on the channel to be validated and appended to their copy of the ledger.

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

Sharding is a scalability technique that involves horizontally partitioning a database or blockchain network. In the context of blockchain, it divides the overall state and transaction processing workload among smaller, parallel chains called 'shards'. Each shard is managed by a subset of network validators, allowing for parallel transaction processing, which significantly increases the network's overall throughput and capacity.

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

Interoperability protocols, commonly implemented as cross-chain bridges, are designed to enable communication and asset transfer between two or more independent blockchain networks. They work by 'locking' an asset on the source chain and 'minting' a representative, wrapped asset on the destination chain, or by using other mechanisms to facilitate secure communication, effectively bridging the two ecosystems.

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

The Execution Layer is responsible for handling the 'computation' part of the blockchain. It takes transactions, executes them using a virtual machine (like the EVM), computes the new state of the blockchain, and maintains the history. It is distinct from the Consensus Layer, which is responsible for agreeing on the order of blocks.

Blockchain Practice Test

Blockchain Practice Test

Blockchain Architecture and Platforms Questions and Answers