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Blockchain CBSA Exam Practice Questions (P. 2)

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Question #6
A ____________cipher basically means it is using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.
What is the cipher type?
  1. A
    Stream
  2. B
    Block
  3. C
    Parallel
  4. D
    RSA

Correct Answer:
A
Stream cipher basically means using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.
Reference:
https://blockgeeks.com/guides/cryptocurrencies-cryptography/

Question #7
You currently using the Metamask Chrome plugin and you see a selection for Etherescan in the plugin.
What is Etherscan used for?
  1. A
    A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum Blockchain
  2. B
    A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Bitcoin Blockchain
  3. C
    A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum and Tokens Blockchain
  4. D
    A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on any Blockchain

Correct Answer:
A
A search engine that allows users to easily lookup, confirm and validate transactions that have taken place on the Ethereum Blockchain
Reference:
https://etherscancom.freshdesk.com/support/solutions/articles/35000022140-what-is-etherscan-

Question #8
What are two challenges with using a Proof of Work algorithm? (Select two.)
  1. A
    Mining pools not allowed
  2. B
    Difficulty rate goes done every year.
  3. C
    Expensive
  4. D
    Power Intensive

Correct Answer:
CD
Reference:
http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read

Question #9
Your customer is an enterprise that is focused on financial sectors.
What type of blockchain would this customer likely want specified for their enterprise?
  1. A
    Permissionless
  2. B
    Decentralized
  3. C
    Hybrid
  4. D
    Permissioned

Correct Answer:
D
Sometimes referred to as "private" blockchains, you are required to have some sort of permission to access any or parts of that blockchain. There are a multitude of variants and hybrid permissioned/permissionless blockchains that exist.
Reference:
https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095

Question #10
Which is the following is the metaphor that describes a logical dilemma that plagues many computer networks?
  1. A
    Neo Generals' problem
  2. B
    Byzantine Generals' problem
  3. C
    Byzantine Admirals' problem
  4. D
    Renaissance Generals' problem

Correct Answer:
B
BFT is so-named because it represents a solution to the "Byzantine generals' problem," a logical dilemma that researchers Leslie Lamport, Robert Shostak and
Marshall Pease described in an academic paper published in 1982
Reference:
https://www.nasdaq.com/article/byzantine-fault-tolerance-the-key-for-blockchains-cm810058

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