Data and Transaction Flow in Blockchain BDC Practice Questions (Page 10)

Questions 46–50

1. 46application · easy

   A node receives a new transaction from a peer. After validating it, the node adds it to its mempool. What should the node do next to ensure the transaction reaches the rest of the network?

   • AForward the transaction to all connected peers that have not already seen it
   • BSend the transaction only to the miner with the highest hash rate
   • CStore the transaction locally and wait for a peer to request it
   • DWait for the next block to be mined before forwarding the transaction
   Reveal Solution Discussion Select an answer first
2. 47foundation · easy

   How are new transactions typically propagated across a peer-to-peer blockchain network?

   • AFlooded to neighboring nodes, which then relay them to their neighbors until the network is covered
   • BStored locally and only shared when a new block is mined
   • CBroadcast to all nodes simultaneously using a global broadcast channel
   • DSent directly to a central server that distributes them to all nodes
   Reveal Solution Discussion Select an answer first
4. 48foundation · easy

   What is the purpose of the Merkle root in a newly created block?

   • ATo store the block's timestamp
   • BTo link the block to the previous block
   • CTo summarize all transactions in the block into a single hash
   • DTo encrypt the transactions in the block
   Reveal Solution Discussion Select an answer first
5. 49application · medium

   A developer is designing a supply-chain tracking system. They need to prove that a specific document existed at a certain time, but the document is too large to store on-chain. Which approach best achieves this while keeping the document off-chain?

   • AEncrypt the document and store the ciphertext on-chain
   • BStore the document in a sidechain and link it via a hash pointer
   • CStore the full document in a transaction's data field
   • DStore a hash of the document in a transaction and keep the document in an external database
   Reveal Solution Discussion Select an answer first
6. 50expert · medium

   A user submits a transaction to a node. The node validates it and adds it to its mempool, but the transaction is not included in the next block. The transaction remains in the mempool for several blocks and is eventually included. Which factor most likely determined the delay?

   • AThe transaction was not propagated to all nodes
   • BThe transaction's signature was invalid
   • CThe transaction was waiting for a locktime to expire
   • DThe transaction's fee rate was lower than other transactions in the mempool
   Reveal Solution Discussion Select an answer first