FREE CBE Blockchain Technology Fundamentals Questions and Answers

Question 1

What is the primary function of a blockchain?

Accepted Answer

Distributed ledger

Answer

A blockchain is fundamentally a type of distributed ledger technology (DLT). It is a decentralized, immutable, and cryptographically secured record of transactions that is shared and synchronized across a network of computers. This distributed nature eliminates the need for a central authority, enhancing transparency and security.

Question 2

Which component of a blockchain contains the hash of the previous block?

Accepted Answer

Header

Answer

Each block in a blockchain contains a header, which holds crucial metadata about the block. This metadata includes the hash of the previous block, a timestamp, the Merkle root of the transactions within the current block, and a nonce. The inclusion of the previous block's hash creates a cryptographic link, forming the 'chain' and ensuring data integrity.

Question 3

What is a node in the context of blockchain?

Accepted Answer

Network participant

Answer

In the context of blockchain, a node is any computer or device participating in the blockchain network. Nodes store a copy of the blockchain ledger, validate transactions, and contribute to maintaining the network's integrity and security. They act as the distributed backbone of the blockchain.

Question 4

What ensures the immutability of blockchain data?

Accepted Answer

Hash functions and consensus

Answer

The immutability of blockchain data is primarily ensured by the combination of cryptographic hash functions and consensus mechanisms. Each block contains a hash of the previous block, making any alteration to past data immediately detectable. Consensus mechanisms, like Proof of Work, ensure that all network participants agree on the valid state of the ledger, making it extremely difficult to tamper with records.

Question 5

Which of the following best defines a public blockchain?

Accepted Answer

Permissionless and open

Answer

A public blockchain is characterized by being permissionless and open, meaning anyone can join the network, participate in validating transactions, and read the ledger without needing special authorization. This contrasts with private or consortium blockchains, which restrict access and participation. Bitcoin and Ethereum are prime examples of public blockchains.

CBE - Certified Blockchain Expert Practice Test

CBE - Certified Blockchain Expert Practice Test

FREE CBE Blockchain Technology Fundamentals Questions and Answers