File Info
| Exam | BTA Certified Blockchain Solution Architect |
| Number | CBSA |
| File Name | Blockchain.CBSA.PracticeTest.2019-11-04.119q.tqb |
| Size | 713 KB |
| Posted | Nov 04, 2019 |
| Download | Blockchain.CBSA.PracticeTest.2019-11-04.119q.tqb |
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Demo Questions
Question 1
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.
- NSA is spying on us so what’s it matters.
- Depends on input
- False
- True
Correct answer: D
Explanation:
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 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
Question 2
In the Ethereum EVM there are two types of memory areas. (Select two.)
- Storage
- Database
- Memory
- Persistent
- Ephemeral
Correct answer: AC
Explanation:
Reference: https://solidity.readthedocs.io/en/latest/introduction-to-smart-contracts.html#the-ethereum-virtual-machine Reference: https://solidity.readthedocs.io/en/latest/introduction-to-smart-contracts.html#the-ethereum-virtual-machine
Question 3
What are some advantages of Proof of Stake(POS) mining over Proof of Work(POW) mining? (Select three.)
- Energy efficient in regards to that it could consume for electricity as compared to PoW
- Faster Hashing algorithms
- No need for expensive compared to POW
- Faster validations compared to POW
- Better blockchain security compared to POW
Correct answer: ACD
Explanation:
This eliminates the below challenges from PoW and believed to have an advantage. No need of expensive hardware (a normal laptop or computer running the respective coin’s Validator client will do as long as your laptop or computer is online) Energy efficient as it won’t consume high electricity as PoW does More loyal Validators As higher the stake the Validators have for a long time, more chances for the Validator to be picked up for “forging” and earn the transaction fee Faster validations Reference: https://medium.com/@karthik.seshu/cryptocurrency-proof-of-work-vs-proof-of-stake-e1eee1420b10 This eliminates the below challenges from PoW and believed to have an advantage.
No need of expensive hardware (a normal laptop or computer running the respective coin’s Validator client will do as long as your laptop or computer is online)
Energy efficient as it won’t consume high electricity as PoW does More loyal Validators As higher the stake the Validators have for a long time, more chances for the Validator to be picked up for “forging” and earn the transaction fee Faster validations
Reference: https://medium.com/@karthik.seshu/cryptocurrency-proof-of-work-vs-proof-of-stake-e1eee1420b10
