Auditing, Testing, and Monitoring in Blockchain Security BDC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   What is the primary purpose of integration testing for blockchain applications?

   • ATo test individual functions for correctness
   • BTo measure the gas cost of each transaction
   • CTo simulate a 51% attack on the network
   • DTo verify that multiple smart contracts and external systems work together correctly
   Reveal Solution Discussion Select an answer first
2. 27expert · hard

   A proof-of-stake blockchain network has a small number of validators. The security team is concerned about a 51% attack. They want to implement a monitoring solution that detects a potential attack early. Which monitoring approach is most effective?

   • AMonitor the price of the network's native token
   • BMonitor the network's transaction volume and alert on spikes
   • CMonitor the number of active validators and alert if it drops below a threshold
   • DMonitor the block production rate and alert if it deviates from the expected rate
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A blockchain company is subject to GDPR and wants to ensure their smart contract audit process complies with data protection requirements. What should they include in their audit plan?

   • AA requirement to use only open-source tools
   • BA data protection impact assessment and a review of how personal data is handled in the contract and associated systems
   • CA plan to store all audit data on a public blockchain
   • DA review of the smart contract code for vulnerabilities
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A DeFi protocol team is planning a security audit before launch. The protocol uses a custom oracle and a staking contract. The team has limited budget and wants the audit to focus on the highest-risk areas. Which audit scope definition is most appropriate?

   • AScope the audit to the oracle and staking contract, define threat models for both, and include compliance requirements relevant to the protocol's jurisdiction
   • BAudit the entire codebase, including the oracle and staking contract, with a full threat model and compliance review
   • CFocus on the staking contract only, since it handles user funds and is the most critical component
   • DPerform a quick automated scan of all contracts and only manually review the staking contract
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   During a smart contract audit, you find a function that updates a user's balance after an external call. Which combination of testing techniques would best confirm whether this is a reentrancy vulnerability?

   • AUse a combination of static analysis to identify the pattern, then write a unit test that simulates a reentrant call to confirm the exploit
   • BDeploy the contract on a testnet and call it with a reentrancy attack contract
   • CRun a static analyzer and review the function manually
   • DWrite a unit test that calls the function normally and check the balance update
   Reveal Solution Discussion Select an answer first