Distributed Consensus

A distributed system contains _____ nodes.

• zero node

• one node

• two node

• multiple node

Consensus is an agreement among a group of  people on

• IDEA

• STATEMENT

• PLAN OF ACTION

• ALL OF ABOVE

These are almost never paid  for their contribution to the blockchain system, and  mostly act as an access point for broadcasting  transactions

• Mining Nodes

• Light Nodes

• Full Nodes

• None of the above

Goal of blockchain consensus algorithms is to be BFT

• True

• False

• Depends on situation

fBFT was introduced by:

• RIPPLE

• STELLAR

• HYPERLEDGER

• CORDA

In PoW, which nodes solve cryptography Hash problems:

• MINING NODES

• LIGHT NODES

• ASYMMETRIC NODES

• SYMMETRIC NODES

Known vulnerability in PoW is

• 51% Attack

• DAO Attack

• Sybil Attack

• No Attacks Possible

DELEGATE PROOF OF STAKE WAS DEVELOPED BY

• DAN LARIMER

• SATOSHI MAKAMOTO

• VITALIK BUTERIN

• RIPPLE

HYPERLEDGER FABRIC USES-

• pBFT

• fBFT

• CBFT

• aBFT

In Proof of importance, ‘Importance Score’ based on 3  factors, which of the following is not a considered factor:

• stake

• Partners

• Recent Transactions

• Sybil