Blockchain Technology Concepts and Distributed Ledger Technology (DLT) BDC Practice Questions (Page 9)

Questions 41–45

1. 41expert · hard

   A blockchain developer is debugging a synchronization issue in a private blockchain. Node A has a block with hash 'abc123', and Node B has a block with the same height but hash 'def456'. Both nodes believe their chain is valid. What is the most likely cause of this discrepancy?

   • AOne node has a different timestamp in the block header, but the transactions are identical.
   • BThe two nodes have different transaction sets in the block, leading to different block hashes.
   • COne node has a corrupted database that is not affecting the block hash.
   • DThe nodes are using different hash algorithms, but both are valid.
   Reveal Solution Discussion Select an answer first
2. 42foundation · easy

   What is the primary role of cryptographic hashing in a blockchain?

   • ATo compress blocks so they take up less storage space.
   • BTo generate private keys for users.
   • CTo create a unique fingerprint of data that ensures integrity and links blocks.
   • DTo encrypt transaction data so only authorized parties can read it.
   Reveal Solution Discussion Select an answer first
4. 43foundation · easy

   Which of the following best defines a blockchain?

   • AA distributed ledger that records transactions in a chain of blocks, secured by cryptographic hashes and consensus among participants.
   • BA type of distributed database that uses a central authority to validate all transactions before they are added.
   • CA centralized database that stores transaction records in tables and is managed by a single administrator.
   • DA peer-to-peer network that only stores encrypted messages and does not require consensus or a shared ledger.
   Reveal Solution Discussion Select an answer first
5. 44foundation · easy

   Which type of blockchain is typically open to anyone to join and participate in the consensus process?

   • AHybrid blockchain
   • BPrivate blockchain
   • CPublic blockchain
   • DConsortium blockchain
   Reveal Solution Discussion Select an answer first
6. 45foundation · easy

   Which cryptographic technique is primarily used to secure transactions and control access in a blockchain?

   • APublic-key cryptography (asymmetric encryption).
   • BSymmetric encryption with a shared secret key.
   • CQuantum encryption for all data at rest.
   • DSteganography to hide transaction details.
   Reveal Solution Discussion Select an answer first