Free BTA Certified Blockchain Solution Architect Exam CBSA Exam Practice Test

What are two advantages of using a DPOS algo in a blockchain? (Select two.)

• Scalable
  
• Governance Model
  
• Efficiency
  
• Fast transactions
  
• Centralized
  

Ethereum currently uses the ___________Consensus Algo and in the future it is planned to go to the __________Consensus Algo?

• PoW, DPoS
  
• PoW, PoS
  
• PoS, PoW
  
• DPoS, PoW
  

When you considering cryptography for a blockchain what would be types ofsymmetric cryptography you could consider? (Select two.)

• Block Ciphers
  
• Rivest-Shamir-Adleman algorithm aka the RSA.
  
• Stream Ciphers
  
• Elliptical Curve Cryptography
  

In public key cryptography, the public key is used to:

• Sign/approve any transaction/action that might be made by the holder of the key pair
  
• Verify the digital signature of a given key pair
  
• Decrypt the private key so valid transactions/actions can be performed
  
• Encrypt the private key
  

Consider the following scenario. A startup is building a chat app for smart phones where the messages sent between users are anonymous and get destroyed within 24 hours of being sent.Which architecture would best solve the product need?

• Ethereum for token management and chat messages; Mobile apps use JSON-RPC to communicate directly with Smart Contracts
  
• Private blockchain to persist chat messages; Custom built token system with private blockchain smart contract
  
• Token management for shareholders in a public blockchain; Mobile apps and data management built on existing multitier systems without use of blockchain
  
• Hybrid blockchain for token management with Proof of Stake; private blockchain to persist the chat messages
  

Ethereum is a programmable blockchain. What is one of the following reasons is NOT correct regarding Ethereum programmability?

• Allows users to create their own operations on any complexity
  
• It serves as a platform for many different types of decentralized blockchain applications
  
• Does not allow users to create their own operations of any complexity
  
• Ethereum also includes a peer-to-peer network protocol
  

Your company is looking to develop a new token and raise funds for this new platform.What is the process your company would like go thru to raise funds?

• Crowfunding
  
• ICO
  
• Audit
  
• IPO
  

In Hyperledger, nodes need a ________________ to be able to communicate to the network.

• Valid Certificate
  
• Valid License
  
• Valid YAML file
  
• Valid JSON file
  

In common blockchain design, identity and transaction approval is possible through:

• AES encryption
  
• Public key cryptography
  
• Secret key cryptography
  
• None of the above
  

Ethereum tries to keep the mining time difference between ____ and _____seconds.

• 10, 18
  
• 10, 20
  
• 10, 29
  
• 10, 19