Mitigating Blockchain Attacks and Security Practices BFC Practice Questions (Page 7)

Questions 31–35

1. 31application · medium

   A blockchain-based supply chain platform has experienced a security incident where a validator node was compromised. The incident response plan must be updated. Which update is most important to include?

   • ADefine a procedure for rotating validator keys and removing the compromised node from the consensus set
   • BAdd more monitoring alerts for network latency
   • CIncrease the frequency of full backups of the blockchain database
   • DSchedule a public relations campaign to reassure customers
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A consortium blockchain is governed by multiple organizations. They want to ensure that security policies are consistently enforced and that any changes to the network require consensus. Which governance framework element is most essential?

   • AA public bug bounty program to identify vulnerabilities.
   • BA single administrator with full control over the network to make quick decisions.
   • CA formal change advisory board (CAB) with representatives from each member organization that approves all protocol changes.
   • DAn automated script that deploys updates without human review.
   Reveal Solution Discussion Select an answer first
4. 33foundation · easy

   Which network security measure can help mitigate an eclipse attack on a blockchain node?

   • AIncreasing the block size
   • BDisabling encryption on peer connections
   • CLimiting the number of incoming connections from the same IP address
   • DUsing a longer hash algorithm
   Reveal Solution Discussion Select an answer first
5. 34expert · hard

   A proof-of-work cryptocurrency with a market cap of $50M has seen a sudden increase in mining power from a single pool, now controlling 48% of the network hashrate. The development team is considering options to mitigate the risk of a 51% attack. They have limited time and budget. Which option is the most effective immediate mitigation?

   • AIncrease the block reward to attract more miners
   • BChange the consensus algorithm to proof-of-stake
   • CAsk the mining pool to voluntarily reduce its hashrate
   • DImplement a checkpointing mechanism that finalizes blocks every 100 blocks
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A cryptocurrency exchange is concerned about a potential 51% attack on a small proof-of-work coin it lists. The exchange wants to reduce the risk of accepting double-spent transactions. Which measure is most effective?

   • ASwitch the coin to proof-of-stake immediately.
   • BRequire a higher number of confirmations for deposits of that coin.
   • CAccept transactions with zero confirmations for faster user experience.
   • DMonitor the network's hashrate and pause trading if it drops significantly.
   Reveal Solution Discussion Select an answer first