Blockchain Architecture and Its Core Components BBLC Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the primary method for propagating transactions and blocks in a blockchain P2P network?

   • AStoring data on a shared file system
   • BSending data only to a central server
   • CFlooding the network by sending data to all connected peers
   • DUsing email to notify all nodes
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A blockchain developer is explaining to a client why a block's header includes the hash of the previous block. Which statement best describes the purpose of this field?

   • AIt stores the digital signature of the block's creator for authentication.
   • BIt links the current block to the previous one, creating a chain that makes tampering evident.
   • CIt contains the timestamp of when the previous block was created.
   • DIt identifies the miner who solved the previous block's puzzle.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A blockchain engineer is reviewing the structure of a block. She notices that the block header contains a field that references the previous block. What is the purpose of this field?

   • AIt contains the public key of the previous block's miner.
   • BIt contains the timestamp of the previous block to synchronize clocks.
   • CIt contains the hash of the previous block's header, which links the blocks and ensures the chain's integrity.
   • DIt contains the size of the previous block in bytes.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the primary purpose of a consensus mechanism in a blockchain?

   • ATo store transaction data on a central server
   • BTo encrypt transactions before they are broadcast
   • CTo allow nodes to agree on the valid state of the ledger
   • DTo create new user accounts
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   How does a distributed ledger ensure transparency?

   • ABy storing data on a public cloud server
   • BBy encrypting all data so only the network administrator can view it
   • CBy using a central authority to publish all transactions
   • DBy allowing all authorized participants to view the same ledger data
   Reveal Solution Discussion Select an answer first