Blockchain Technology Architecture and Platforms 2

Question 1

Which consensus mechanism does Ethereum use after 'The Merge' in 2022?

Accepted Answer

Proof of Stake

Answer

Ethereum switched from Proof of Work to Proof of Stake during 'The Merge' in September 2022.

Question 2

What is a 'shard' in the context of blockchain scalability?

Accepted Answer

A partition of the network that processes transactions in parallel

Answer

Sharding divides the blockchain network into smaller partitions called shards, each capable of processing transactions independently to improve throughput.

Question 3

What distinguishes a permissioned blockchain from a permissionless one?

Accepted Answer

Only approved participants can join and transact on a permissioned blockchain

Answer

A permissioned blockchain restricts participation to pre-approved entities, unlike permissionless blockchains where anyone can join.

Question 4

What is the primary role of a 'validator node' in a Proof of Stake network?

Accepted Answer

To propose and attest to new blocks by staking cryptocurrency as collateral

Answer

Validators in PoS networks lock up (stake) cryptocurrency as collateral and are chosen to propose or vote on new blocks.

Question 5

What is the function of the 'mempool' in blockchain architecture?

Accepted Answer

A temporary holding area for unconfirmed transactions

Answer

The mempool (memory pool) is a node's waiting room where unconfirmed transactions sit until miners or validators include them in a block.

Blockchain Practice Test

Blockchain Practice Test

Blockchain Technology Architecture and Platforms 2