Blockchain Deployment and Monitoring Tools BDC Practice Questions (Page 8)

Questions 36–40

1. 36application · medium

   A developer is deploying an Ethereum smart contract to a testnet using Hardhat. The contract constructor requires an initial owner address. The deployment script currently reads the owner from a hardcoded value in the script. The team wants to avoid committing the owner address to source control and wants the deployment to be reproducible across environments. What should the developer do?

   • AHardcode the owner address in the contract constructor and redeploy for each environment
   • BStore the owner address in the Hardhat config file under networks.testnet
   • CRead the owner address from the first account returned by ethers.getSigners()
   • DUse a .env file with the owner address and reference process.env.OWNER_ADDRESS in the Hardhat script
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2. 37expert · hard

   A blockchain network is experiencing intermittent performance degradation. Monitoring shows that CPU usage is high on all nodes, but block times are still within acceptable limits. The team needs to determine whether the issue is caused by transaction volume or by inefficient node configuration. Which metric would best help differentiate between these two causes?

   • APeer count
   • BDisk I/O wait time
   • CTransaction pool size over time
   • DBlock height
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4. 38expert · hard

   A compliance officer requires that all transaction data on a permissioned blockchain be retained for 7 years. The blockchain network uses a pruning mechanism to reduce storage. The team must ensure compliance without breaking the network's consensus mechanism. What is the most appropriate approach?

   • AIncrease the pruning interval to keep more data on-chain.
   • BUse an off-chain data store (e.g., a database) to archive transaction data before it is pruned.
   • CUse a block explorer to store the transaction data.
   • DDisable pruning on all nodes to retain full transaction history.
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5. 39foundation · easy

   What is the primary purpose of setting up alerts in a blockchain deployment?

   • ATo replace the need for regular backups
   • BTo notify operators of critical events such as node downtime
   • CTo encrypt node communication
   • DTo automatically deploy new smart contracts
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6. 40expert · hard

   A blockchain operations team has set up a Prometheus alert that fires when the 'eth_syncing' metric is true for more than 5 minutes. The alert fires frequently for a newly deployed node, but the node eventually catches up. The team wants to reduce alert fatigue without missing real sync issues. What is the most appropriate action?

   • AAdd a condition that the node's block height must be increasing by at least 1 block per minute.
   • BIncrease the alert threshold to 30 minutes.
   • CChange the alert to fire only when the node's peer count drops to zero.
   • DDisable the alert for the first 24 hours after node deployment.
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