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Blockchain CBSA Exam Practice Questions (P. 3)

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Question #11
The key difference between encryption and hashing is that encrypted strings can be reversed back into their original decrypted form if you have the right key?
  1. A
    TRUE
  2. B
    FALSE

Correct Answer:
A
Reference:
https://www.securityinnovationeurope.com/blog/page/whats-the-difference-between-hashing-and-encrypting

Question #12
What is a logic gate in electronics and computer science?
  1. A
    A logic gate usually takes in 2 inputs and gives out 1 output. The inputs and outputs are binary values, meaning they can be both 1 and 0.
  2. B
    A logic gate usually takes in 3 inputs and gives out 2 output. The inputs and outputs are binary values, meaning they can be 1 or 0.
  3. C
    A logic gate usually takes in 2 inputs and gives out 6 output. The inputs and outputs are binary values, meaning they can be both 1 and 0.
  4. D
    A logic gate usually takes in 2 inputs and gives out 1 output. The inputs and outputs are binary values, meaning they can be 1 or 0.

Correct Answer:
D
A logic gate usually takes in 2 inputs and gives out 1 output. The inputs and outputs are binary values, meaning they can be 1 or 0. A XOR logic gate takes in 2 binary inputs and gives out a high output ONLY when the inputs are different. Meaning, if A and B are inputted to a XOR gate then the out C will be 1 ONLY when
A is not equal to B.
Reference:
https://blockgeeks.com/guides/cryptocurrencies-cryptography/

Question #13
Ethereum is considered to be a ______________type of blockchain.
  1. A
    Permissionless
  2. B
    Permission Based
  3. C
    Hybrid
  4. D
    Private

Correct Answer:
A
Permissionless - anyone can join Anyone can run a node, run mining software/hardware, access a wallet and write data onto and transact within the blockchain
(as long as they follow the rules of the bitcoin blockchain). There is no way to censor anyone, ever, on the permissionless bitcoin blockchain.
Reference:
https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095

Question #14
Your company working for is now considering the blockchain. They would like to perform a POC with R3 Corda. The CIO was reading about different blockchain consensus algos and would like to understand what type of consensus algos is used with Corda.
What is the best answer?
  1. A
    R3 Corda is a pluggable blockchain and allows the enterprise flexibility
  2. B
    R3 Corda is a byzantine fault tolerant blokchain
  3. C
    R3 Corda is a proof of stake based blockchain
  4. D
    R3 Corda is a proof of work based blockchain

Correct Answer:
A
Corda does not share the same requirements as Bitcoin: we require absolute certainty over transaction finality and we need to know who our counterparts are. So we had the freedom "" and took this opportunity "" to solve the consensus problem in a different way. In particular, Corda solves the privacy issue in a number of manners, primarily by allowing for separation of consensus into a service which we call the Notary Cluster. Corda was designed for business from the start. It has no cryptocurrency built into the platform and does not require mining-style consensus, which imposes great cost with little business benefit.

Question #15
Secure Hash Algorithm (SHA-256) output is always 256 bits or 32 bytes in length regardless of the length of the input (even if input is millions of bytes). Select best answer.
  1. A
    NSA is spying on us so what's it matters.
  2. B
    Depends on input
  3. C
    False
  4. D
    True

Correct Answer:
D
SHA stands for Secure Hash Algorithm. This is used to prove data integrity. The same input(s) will always produce the exact same output. This output is always
256 bits or 32 bytes in length regardless of the length of the input (even if input is millions of bytes).
Reference:
https://medium.com/all-things-ledger/bitcoins-implementation-of-blockchain-2be713f662c2

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