Blockchain Integration with Emerging Technologies BDC Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   What blockchain feature can secure user identities in AR/VR environments?

   • ACentralized authentication server
   • BDecentralized identity management
   • CPublicly visible personal data
   • DShared passwords for all users
   Reveal Solution Discussion Select an answer first
2. 32foundation · easy

   What is the primary threat that quantum computing poses to blockchain security?

   • AIt would increase transaction fees
   • BIt could break the cryptographic algorithms that secure blockchain transactions
   • CIt would make blockchain networks completely centralized
   • DIt would eliminate the need for consensus
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A smart city deploys thousands of sensors that send telemetry to edge nodes. The city wants to enable autonomous machine-to-machine payments (e.g., a sensor paying for data storage) and ensure that data from each sensor cannot be altered after collection. Which architecture best achieves both goals?

   • ASensors sign each data packet and submit hashes to a permissioned blockchain; edge nodes run smart contracts for micro-payments
   • BEdge nodes store all data locally and use a shared spreadsheet to track payments
   • CSensors send raw data directly to a central cloud database, which periodically writes a hash to a public blockchain
   • DSensors use a private key to encrypt data and send it to a central authority that approves all transactions
   Reveal Solution Discussion Select an answer first
5. 34foundation · easy

   What is self-sovereign identity in blockchain?

   • AIdentity is controlled by a government agency
   • BIdentity is public and unchangeable
   • CIdentity is managed by a corporation
   • DUsers have full control over their digital identity and personal data
   Reveal Solution Discussion Select an answer first
6. 35foundation · easy

   How can blockchain facilitate secure vehicle-to-everything (V2X) communication?

   • ABy allowing any node to modify message history
   • BBy using a single central server to relay all messages
   • CBy providing a tamper-proof record of messages exchanged between vehicles and infrastructure
   • DBy broadcasting all messages in plaintext
   Reveal Solution Discussion Select an answer first