Interoperability Innovations BDC Practice Questions (Page 2)

Questions 6–10

1. 6expert · medium

   A cross-chain bridge uses a set of 5 validators, and a security researcher discovers that 3 of the validators are operated by the same entity. What is the most critical risk, and what is the best mitigation?

   • AThe entity could steal user data; mitigate by encrypting all bridge messages.
   • BThe entity could slow down the bridge; mitigate by increasing the number of validators.
   • CThe entity could cause a fork; mitigate by using a different consensus algorithm.
   • DThe entity could collude to approve fraudulent transfers; mitigate by ensuring validators are operated by independent entities.
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A developer is building a parachain on Polkadot and wants to enable communication with other parachains and with external networks like Ethereum. Which set of tools should they use?

   • AUse a federated bridge operated by the Web3 Foundation for all external communication.
   • BDeploy a standalone smart contract on Ethereum and use events to communicate with the parachain.
   • CUse the Cosmos IBC protocol directly for all communication, including with Ethereum.
   • DUse the Polkadot relay chain for parachain-to-parachain messaging and a bridge pallet for external networks.
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   Which of the following is an emerging trend in blockchain interoperability?

   • ACross-chain asset management and liquidity aggregation
   • BThe use of a single global blockchain for all transactions
   • CThe adoption of a single token standard for all blockchains
   • DThe removal of all bridges due to security concerns
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A supply-chain platform wants to track goods across multiple blockchains used by different suppliers and also verify external sensor data. Which emerging trend in interoperability best addresses this need?

   • AUsing a single blockchain for all suppliers to simplify tracking.
   • BCross-chain data sharing combined with oracle integration for off-chain sensor data.
   • CRelying on manual data entry from each supplier into a central database.
   • DUsing a federated bridge to transfer all sensor data to one chain.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A bridge has been exploited because an attacker tricked the bridge's validators into signing a transaction that released funds without a corresponding deposit on the source chain. What type of vulnerability is this?

   • AA smart contract bug in the bridge's token contract
   • BA validator collusion or compromise attack
   • CA denial-of-service attack on the bridge
   • DA replay attack on the source chain
   Reveal Solution Discussion Select an answer first