chapter 12

Question 1

What is blockchain under traditional

Answer 1

• Centralized
• Middleman
• One copy of the ledger

Question 2

What is blockchain (NEW)

Answer 2

• Decentralized
• Distributed ledger
• No middleman
• It cannot be modified without everyone knowing
• Write once and everyone can read the changes

Question 3

Distributed and decentralized:

Answer 3

Data is distributed and synchronized among all participants

Question 4

Consensus

Answer 4

All participants are aware of transactions; written to the block

Question 5

Immutability:

Answer 5

Once the transaction is confirmed; it can’t be tampered with and cannot be altered

Question 6

What is proof of work:

Answer 6

Miners compete to create the next block; solve complex math problems; use computer power

Question 7

What is proof of authority

Answer 7

Admin identities who creating the blocks; the network can vote for admin removal in case of malicious behavior

Question 8

What is proof of stake:

Answer 8

Validators who propose the next block lock up an amount of their cryptocurrency as a deposit to ensure honest behavior

Question 9

what is the difference between Bitcoin and Ethereum

Answer 9

Bitcoin
1. 10 mins one block
1. 12.5 bitcoin reward
1. Higher fees
Ethereum
1. 10-12 seconds = 1 block
1. Mining is at a constant rate
1. Reward 3 ether
1. Low transaction cost

Question 10

What is machine learning?

Answer 10

Computer ability to learn from experience rather than instructions

Question 11

What are the types of learning

Answer 11

Classification and regression

Question 12

What is classification ( supervised learning)

Answer 12

Adding labels; yes or no; spam or not spam

Question 13

What is regression (unsupervised learning)

Answer 13

Predict real numbers; price of house, revenue next quarter

Question 14

What is RPA and how can it be used?

Answer 14

uses automation technologies to mimic back-office tasks of human workers, such as extracting data, filling in forms, moving files