Blockchain Deployment and Monitoring Tools BDC Practice Questions (Page 7)

Questions 31–35

1. 31expert · medium

   A developer is deploying a smart contract to a private Ethereum network. The contract's constructor sets an owner variable. The deployment transaction is successful, but the owner variable is not set correctly. What is the most likely cause?

   • AThe constructor was not called during deployment.
   • BThe contract was compiled with an older version of the Solidity compiler.
   • CThe deployment script passed the wrong argument to the constructor.
   • DThe contract's storage was corrupted during deployment.
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A monitoring alert fires indicating that a blockchain node's disk is 95% full. The node is critical for transaction validation. What is the most appropriate immediate response?

   • AIncrease the disk size of the virtual machine and then restart the node
   • BReduce the node's log level to 'error' to free up space
   • CIgnore the alert because the node will continue to operate until the disk is completely full
   • DDelete the node's blockchain data and resync from genesis
   Reveal Solution Discussion Select an answer first
4. 33expert · hard

   A security analyst notices a series of transactions from a single account that are failing validation due to nonce gaps. The transactions are being submitted repeatedly. The analyst suspects a misconfigured client, but also wants to rule out a malicious attack. Which monitoring data would be most useful to differentiate between these two possibilities?

   • AThe gas price of the failing transactions
   • BThe block height at which the transactions were submitted
   • CThe total number of failed transactions in the last hour
   • DThe source IP address and user-agent of the transaction submissions
   Reveal Solution Discussion Select an answer first
5. 34foundation · easy

   Which of the following is a typical first step in an incident response procedure for a blockchain node failure?

   • AContact all network participants to inform them
   • BImmediately restart the node without investigation
   • CDelete all logs to free up space
   • DIdentify the root cause and assess the impact
   Reveal Solution Discussion Select an answer first
6. 35foundation · easy

   Which metric indicates the current length of the blockchain and is commonly used to assess a node's synchronization status?

   • APeer count
   • BCPU usage
   • CTransaction throughput
   • DBlock height
   Reveal Solution Discussion Select an answer first