2.Consensus Algorithm

Consensus ensures:

• Central control
  

• Single-point failure

• Agreement across nodes

• Faster compression

Proof of Work is based on:

• Stake

•  Random selection

• Solving mathematical puzzles

• Voting

Which consensus protocol is more suitable for permissioned blockchains?

• Proof of Stake

• PoW

• RAFT

• Mining

Which consensus algorithm uses identity as the main selection mechanism?

• PoS

• PBFT

•  PoW

•  PoA

Which consensus algorithm finalizes transactions faster (low latency)?

• PoW

• PoS

• PoA

• PBFT

What is "slashing" in PoS?

• Lowering block size

• Reducing transaction fees

• Increasing stake value

• Penalizing malicious validatorS

In PoW, the time between two blocks is kept consistent by adjusting:

• Block size

• Mining difficulty

• Nonce range

• Transaction fees

PBFT stands for:

• Practical Byzantine Fault Tolerance

• Public Blockchain Functionality Tool

• Private Blockchain Fault Tracker

• Permission-Based Fabric Token

Who validates blocks in Proof of Authority?

• Random users

•  Nodes selected based on stake
  

•  Trusted, pre-approved validators

• GPU miners

A scalability issue in blockchain is:

• Block size limitation

• High mining rewards

• Increased transaction speed

• Too many miners