CBC CBC Blockchain Architecture & Design

Question 1

Which consensus mechanism requires validators to lock up cryptocurrency as collateral to participate in block creation?

Accepted Answer

Proof of Stake

Answer

Proof of Work

Answer

Delegated Proof of Authority

Answer

Proof of Elapsed Time

Question 2

In a blockchain network, what is the primary role of a full node?

Accepted Answer

Maintain a complete copy of the blockchain and validate all transactions

Answer

Mine new blocks only

Answer

Store only block headers

Answer

Relay transactions without validation

Question 3

What is the Merkle tree structure used for in blockchain design?

Accepted Answer

Efficiently verifying transaction inclusion in a block

Answer

Encrypting wallet private keys

Answer

Storing smart contract bytecode

Answer

Managing peer-to-peer connections

Question 4

Which blockchain topology is best suited for a consortium of competing enterprises that require shared data but controlled access?

Accepted Answer

Permissioned consortium blockchain

Answer

Public permissionless blockchain

Answer

Private single-organization blockchain

Answer

Federated sidechain

Question 5

What does 'sharding' achieve in blockchain architecture?

Accepted Answer

Improves scalability by splitting the network into parallel processing groups

Answer

Reduces storage by deleting old blocks

Answer

Increases security by adding more encryption layers

Answer

Simplifies smart contract execution

Question 6

In blockchain design, what is a 'genesis block'?

Accepted Answer

The first block in a blockchain, hardcoded with no predecessor

Answer

The most recently mined block

Answer

The block with the highest transaction volume

Answer

A special block used for smart contract deployment