CBSA Core Blockchain Principles 4

Question 1

In Hyperledger Fabric, what component is responsible for ordering transactions and creating blocks?

Accepted Answer

Ordering service (orderer)

Answer

The ordering service collects endorsed transactions, orders them deterministically, and cuts them into blocks distributed to peer nodes.

Question 2

What is a 'smart contract' oracle problem?

Accepted Answer

Smart contracts cannot natively access real-world off-chain data without a trusted data feed

Answer

Blockchains are deterministic closed systems; oracles are third-party services that bridge on-chain contracts with external real-world data.

Question 3

Which cryptographic primitive enables digital signatures used to authenticate blockchain transactions?

Accepted Answer

Asymmetric key cryptography (public-private key pairs)

Answer

Digital signatures use a private key to sign transactions and a corresponding public key to verify authenticity without revealing the private key.

Question 4

What is the purpose of a 'block header' in a blockchain block?

Accepted Answer

It contains metadata including the previous block hash, timestamp, Merkle root, and nonce

Answer

The block header contains the cryptographic linkage (previous hash) and summary data (Merkle root) that allow lightweight verification without downloading all transactions.

Question 5

What distinguishes a 'consortium blockchain' from both public and fully private blockchains?

Accepted Answer

It is governed and operated by a group of organizations rather than a single entity or the public

Answer

A consortium blockchain is semi-decentralized, with a pre-selected group of organizations jointly controlling consensus and governance.

(CBSA) Certified Blockchain Solution Architect Practice Test

(CBSA) Certified Blockchain Solution Architect Practice Test

CBSA Core Blockchain Principles 4