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Blockchain CBSA Practice Test - Questions Answers, Page 6

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Question 51

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The block creation time is set to how many minutes in Bitcoin?

1
1
10
10
120
120
100
100
15
15
150
150
Suggested answer: B

Explanation:

Remember, that the block creation time is set to 10 minutes and this can never change. So after a fixed time of approximately 2 weeks or exactly 2016 blocks the difficulty is re-adjusted. Increase in difficulty means target decreases.

Reference: https://medium.com/all-things-ledger/decoding-the-enigma-of-bitcoin-mining-f8b2697bc4e2

asked 16/09/2024
Ahmed Dawoud
41 questions

Question 52

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In Hyperledger Fabric chaincode runs in a secured Docker container isolated from the endorsing peer process?

TRUE
TRUE
FALSE
FALSE
Suggested answer: A

Explanation:

Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/chaincode.html

asked 16/09/2024
Vimal Varughese
42 questions

Question 53

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You would like to run Ethereum DApps in a browser without a node. (No need to download blockchain.) What could you use locally in your Chrome browser?

Jaxx
Jaxx
Solidity
Solidity
Metamask
Metamask
Mist
Mist
Suggested answer: C

Explanation:

Metamask is essentially a bridge.

asked 16/09/2024
Steven Chong
34 questions

Question 54

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You would like to start your Gethin Fast Sync Mode.

What is the command for this?

geth-mode"”fast"”cache 4096
geth-mode"”fast"”cache 4096
geth"”fast"”cache 4096
geth"”fast"”cache 4096
geth"”cache"”fast 4096
geth"”cache"”fast 4096
geth"”fast-mode"”cache 4096
geth"”fast-mode"”cache 4096
Suggested answer: B

Explanation:

Reference: https://datawookie.netlify.com/blog/2018/01/ethereum-running-a-node/

asked 16/09/2024
Joseph Varghese
41 questions

Question 55

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Which of the following is not considered an Ethereum testnet?

Ropstein
Ropstein
Rinkeby
Rinkeby
Mainnet
Mainnet
Kovan
Kovan
Suggested answer: C
asked 16/09/2024
Andrey Baturov
39 questions

Question 56

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Looking the graph below, what type of an attack is this likely?

Blockchain CBSA image Question 56 20317 09162024192153000000

51% Attack
51% Attack
P+ Epsilon Attack
P+ Epsilon Attack
Blacklisting
Blacklisting
Selfish Mining Attack
Selfish Mining Attack
Suggested answer: B

Explanation:

A proof of work system is vulnerable to a particular type of attack called the "P+ epsilon attack". In order to understand how this attack works we must define some terms before hand. Un-Coordinated Choice Model: An uncoordinated choice model is a model where all the participants don't have the incentive to work with one another. The participants may form groups but at no time is the group big enough to become a majority.

Reference: https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/

asked 16/09/2024
Tyler Evans
38 questions

Question 57

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What does the 20 in ERC20 mean or relate to?

BIP number
BIP number
Release number
Release number
Update number
Update number
Proposal ID number
Proposal ID number
Suggested answer: D

Explanation:

ERC stands for Ethereum Request for Comments. This is an official protocol for proposing improvements to the Ethereum network. '20' is the unique proposal ID number.

Reference: https://support.exodus.io/article/108-what-is-an-erc20-token-and-does-exodus-support-it

asked 16/09/2024
Ero Hiiesalu
36 questions

Question 58

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You are considering writing a smart contract for Ethereum and would like to use a robust programming language. Which programming language is considered the most flexible and robust for Ethereum?

Solidity
Solidity
Python
Python
Serpent
Serpent
JS
JS
Suggested answer: A

Explanation:

To write smart contracts there are a few different languages: Solidity, which is like JavaScript and has .sol as a file extension, Serpent, Python-like with extension .se, and a 3rd, LLL, based on Lisp. Serpent was popular a while back but Solidity is the most popular right now and more robust, so just use Solidity. You prefer Python? Use Solidity.

Reference: https://medium.com/@ConsenSys/a-101-noob-intro-to-programming-smart-contracts-on-ethereum-695d15c1dab4

asked 16/09/2024
Jaime GONCALVES
45 questions

Question 59

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How many peers in the network need to endorse a transaction in a Hyperledger Fabric blockchain?

The number of peers required to endorse a transaction is driven by the IAM policy that is specified by the ledger.
The number of peers required to endorse a transaction is driven by the IAM policy that is specified by the ledger.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified by the DApps.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified by the DApps.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified by the ledger.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified by the ledger.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified at chaincode deployment time.
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified at chaincode deployment time.
Suggested answer: D

Explanation:

The number of peers required to endorse a transaction is driven by the endorsement policy that is specified at chaincode deployment time.

Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement

asked 16/09/2024
Oleksandr Kondratchuk
35 questions

Question 60

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Every node needs to keep track of time AND it needs to be in synch with its other peer nodes on the blockchain. In Bitcoin for example the current median for time is around?

7 minutes
7 minutes
7 seconds
7 seconds
17 seconds
17 seconds
70 Minutes
70 Minutes
70 Seconds
70 Seconds
Suggested answer: D

Explanation:

The median time differs by more than 70 mins from its system time

Reference: https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/

asked 16/09/2024
João Faria
36 questions
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