CBSA Online Practice Questions and Answers

An encryption algorithm transforms plain text into cipher text using a key?

A. TRUE

B. FALSE

Blockchains are decentralized ledgers which, by definition, are not controlled by a central authority. Due to the value stored in these ledgers, bad actors have huge economic incentives to try and cause faults.

What algo was the original solution to the potential problem as specified by Satoshi?

A. Proof of Stake

B. Byzantine Fault Tolerance

C. Proof of Burn

D. Proof of Work

E. Dynamic Proof of Stake

You are using Geth and you would like to list the accounts controlled by the node.

What is the command?

A. geth list accounts

B. geth account node list

C. geth account node

D. geth account list

______________is supposed to be the constant cost of network resources/utilization in the Ethereum blockchain?

What is the constant?

A. Wei

B. Tether

C. Gas

D. Ether

Ethereum has a metric system of denominations used as units of ether.

What is the smallest denomination of Ether?

A. Kwei

B. Shannon

C. Wei

D. Finney

Chaincode is a decentralized transactional program, running on the validating nodes. As with every chaincode, it implements the ____________________ in particular, Init and Invoke functions.

What does is actually implemented?

A. SDK

B. REST Interface

C. EVM

D. Chaincode interface

Blockchain provenance is defined as _______________?

A. Information sent to the blockchain and written to the blockchain.

B. Recording the history of data, from its last block to various stages of the data lifecycle

C. Recording the history of data, from its inception to various stages of the data lifecycle.

D. Once a transaction has been written and committed to the ledger it cannot be changed.

In what year did a whitepaper that was published by "Satoshi Nakamoto" outlined a solution to the Byzantine Generals problem?

A. 2006

B. 2009

C. 2008

D. 2010

The first actual known blockchain software implementation and deployment occurred:

A. In 1991 by Stuart Haber

B. In 2011 Markus Persson

C. In 2009 by Satoshi Nakamoto

D. In 1991 by Linus Torvalds

By design, permissioned blockchains such as Hyperledger Fabric are not capable of creating or utilizing cryptocurrency.

A. FALSE

B. TRUE

Transactions can be only added to a blockchain.

A. FALSE

B. TRUE

A Smart Contract is most like which classical programming object?

A. Class

B. Variable

C. Method

D. Function

It is impossible to persist media types such as MP3 and MOV on any distributed ledger.

A. FALSE

B. TRUE

Which of these desired outcomes is best obtained through a Blockchain solution?

A. Pending financial transactions need to be stored until completed and then should be deleted

B. A website that shows current data from various stock markets

C. A mobile app that displays information about today's weather

D. None of the above

One consideration that should be taken into account when building a product on a public blockchain is:

A. Blockchain fees associated with transactions that both the product and the user may have in order to use the product on that blockchain

B. What countries the blockchain is available in

C. How you can transfer your tokens to another blockchain if you decide to switch

D. How often the blockchain goes offline for maintenance