Blockchain Technology Concepts and Distributed Ledger Technology (DLT) BDC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   Which statement accurately describes a characteristic of Distributed Ledger Technology (DLT)?

   • ADLT requires a central authority to validate and record transactions.
   • BDLT uses a master copy of the ledger that is updated by a designated leader.
   • CDLT maintains a synchronized, replicated ledger across multiple nodes.
   • DDLT stores data in a single, immutable database that is accessible only to authorized administrators.
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   Which of the following is a key function of a smart contract?

   • ATo encrypt all data on the blockchain.
   • BTo mine new blocks in the blockchain.
   • CTo store large files off-chain.
   • DTo automatically enforce and execute the terms of an agreement.
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A logistics consortium wants to share shipment status across 15 partner companies. Each partner must be able to verify that records have not been altered, but no single partner should control the entire dataset. They are considering a blockchain. Which property of DLT most directly addresses their need for shared, tamper-evident records without a central owner?

   • AA central coordinator stores the master copy and distributes read-only snapshots to partners daily.
   • BEach partner runs a local database and periodically emails encrypted backups to the others for reconciliation.
   • CPartners use a shared spreadsheet with version history to track changes and revert unauthorized edits.
   • DEach partner maintains a full copy of the ledger, and updates are agreed upon through a consensus process.
   Reveal Solution Discussion Select an answer first
5. 29expert · hard

   A developer is writing a smart contract for an insurance product that pays out based on weather data. The contract will receive data from an oracle. What is the most important security consideration when designing this contract?

   • AMake the contract's code public so that users can audit it
   • BEnsure the oracle data is signed and the contract verifies the signature before processing
   • CStore the weather data on-chain in an encrypted format
   • DUse a random number generator inside the contract to validate the weather data
   Reveal Solution Discussion Select an answer first
6. 30expert · hard

   A developer is designing a blockchain for a supply-chain application where each shipment is recorded as a transaction. They want to allow auditors to verify that a specific shipment was recorded without revealing the entire shipment history to the auditor. Which approach achieves this?

   • AUse a Merkle tree in each block and provide the auditor with a Merkle proof for the specific transaction
   • BUse a digital signature from the shipper to prove the transaction was recorded
   • CStore the entire blockchain on the auditor's machine
   • DEncrypt each transaction with a different key and give the auditor all the keys
   Reveal Solution Discussion Select an answer first