Common Threats and Blockchain Security Best Practices BBLC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   Which practice is considered a best practice for securing smart contracts before deployment?

   • AConducting a thorough code audit by independent security experts.
   • BDeploying the contract immediately to production to test it in a live environment.
   • CUsing a single large contract to minimize the number of transactions.
   • DKeeping the source code secret to prevent attackers from finding vulnerabilities.
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   A blockchain-based voting platform has detected a potential smart contract vulnerability that could allow an attacker to manipulate vote counts. The incident response team needs to contain the threat immediately. Which action should be taken FIRST?

   • ADeploy a new version of the smart contract to replace the vulnerable one.
   • BPause the smart contract's voting functionality to prevent further exploitation.
   • CNotify all users to change their passwords immediately.
   • DConduct a full forensic analysis of the blockchain to identify the attacker.
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A company operates a blockchain node that is part of a public network. The node's API is publicly accessible and has been targeted by malicious actors trying to exploit vulnerabilities. Which network security control would be MOST effective in protecting the node's API?

   • ADisable the API entirely and only allow access through a VPN.
   • BImplement rate limiting and require API keys for access.
   • CEncrypt all API traffic with TLS.
   • DUse a firewall to block all traffic from suspicious IP addresses.
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   Which cryptographic technique is primarily used to ensure that a transaction has not been altered after it was signed?

   • ASteganography
   • BDigital signatures
   • CSymmetric encryption
   • DHashing
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A company has developed a private blockchain for internal record-keeping. Before going live, they want to ensure that the system is secure. Which approach is the most comprehensive way to identify vulnerabilities?

   • AAsk the development team to self-review the code for common vulnerabilities.
   • BReview the blockchain's consensus algorithm documentation.
   • CRun a penetration test against the network and application layer.
   • DConduct a formal security audit that includes code review, threat modeling, and penetration testing.
   Reveal Solution Discussion Select an answer first