Blockchain Deployment and Monitoring Tools BDC Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   A blockchain administrator notices that a Bitcoin node's disk usage is growing faster than expected. The node is used for transaction indexing and serves light clients. Which optimization is most likely to reduce disk usage without affecting the node's required functionality?

   • AReduce the number of peer connections to lower network traffic
   • BIncrease the node's memory cache to speed up block processing
   • CEnable pruning to discard old block data while keeping the most recent blocks
   • DDisable the node's transaction index to save space
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   What is the primary purpose of the genesis block in a blockchain network deployment?

   • ATo store the first set of transactions submitted by users
   • BTo store the private keys of all network participants
   • CTo serve as the latest block in the chain after synchronization
   • DTo define the initial state and configuration parameters of the blockchain
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A developer is deploying a smart contract to a private Ethereum network using Truffle. The deployment fails with an error: 'Transaction underpriced.' What is the most likely cause?

   • AThe contract has a compilation error.
   • BThe nonce is incorrect.
   • CThe gas price set in the Truffle config is lower than the network's minimum gas price.
   • DThe account does not have enough funds to cover the gas cost.
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   If monitoring shows that a blockchain node's CPU usage is consistently at 95% and transaction processing is slow, what is the most likely optimization?

   • ADisable all logging to reduce I/O
   • BIncrease the peer count to distribute load
   • CReduce the node's memory allocation
   • DIncrease the node's CPU allocation or optimize the node's configuration
   Reveal Solution Discussion Select an answer first
6. 30expert · medium

   A monitoring dashboard for a Proof-of-Stake (PoS) blockchain shows that a validator node's disk I/O wait time is consistently above 80%, and the node is missing block proposals. The node has plenty of free CPU and memory. The team is considering moving the node to a different cloud instance type. Which instance type characteristic is most important to address the issue?

   • AEnhanced networking with higher bandwidth.
   • BHigher CPU clock speed.
   • CMore memory (RAM).
   • DProvisioned IOPS (Input/Output Operations Per Second) on the attached storage.
   Reveal Solution Discussion Select an answer first