Interoperability in Blockchain Systems BFC Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A global payment company wants to allow its customers to send payments from a bank account to a recipient who uses a blockchain-based wallet. The company needs to integrate its traditional banking rails with the blockchain network. Which type of interoperability best describes this requirement?

   • AProtocol interoperability, because it uses a standard protocol like ISO 20022.
   • BOff-chain interoperability, because it connects a blockchain with a non-blockchain system.
   • CCross-chain interoperability, because it connects two different blockchain networks.
   • DOn-chain interoperability, because the payment is recorded on the blockchain.
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2. 12application · medium

   A bank wants to integrate a blockchain-based trade finance platform with its existing legacy payment systems that use ISO 20022 messages. The bank needs to ensure that payment instructions from the blockchain can be translated into the bank's standard message format. Which approach best addresses this requirement?

   • AUse a middleware adapter that maps blockchain event data to ISO 20022 payment messages and sends them to the legacy system.
   • BDeploy an Interledger Protocol (ILP) connector that translates blockchain transactions into ISO 20022 messages.
   • CReplace the legacy payment system with a new blockchain-native system that natively supports ISO 20022.
   • DImplement a sidechain that runs ISO 20022 as a smart contract and connects to the legacy system via API.
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4. 13expert · hard

   A blockchain architect is designing a cross-chain bridge between a proof-of-work (PoW) blockchain and a proof-of-stake (PoS) blockchain. The bridge must prevent double-spending and ensure that transactions are final on both chains. Which challenge is most critical to address?

   • AGovernance of the bridge's upgrade process.
   • BScalability of the bridge to handle high transaction volumes.
   • CConsensus differences between PoW and PoS that affect finality guarantees.
   • DThe cost of running bridge validators.
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5. 14application · medium

   A blockchain developer is building a cross-chain application that needs to transfer digital assets between a main chain and a secondary chain. The secondary chain is designed to handle higher transaction throughput by processing transactions off the main chain. The developer wants to ensure that assets are securely locked on the main chain and released on the secondary chain. Which interoperability approach is most appropriate?

   • ARelay chain
   • BSidechain
   • CAtomic swap
   • DNotary scheme
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6. 15expert · hard

   A blockchain architect is evaluating interoperability solutions for a financial institution that requires high transaction throughput and low latency. The solution must support cross-chain asset transfers between a public blockchain and a private consortium chain. The architect is considering a relay chain that requires validators to submit and verify block headers from both chains. What is the primary scalability challenge of this approach?

   • AThe relay chain must process and verify every block header, which can become a bottleneck as transaction volume grows
   • BThe relay chain will increase latency because it must wait for finality on both chains before forwarding transactions
   • CThe relay chain requires a trusted third party to manage the validators, which is not acceptable in a financial context
   • DThe relay chain cannot handle assets from a private chain because private chains do not have public block headers
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