Cross-Chain Communication and Interoperability Protocols BBLC Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which protocol is specifically designed to enable general message passing between independent blockchains in the Cosmos ecosystem?

   • ASidechain
   • BAtomic swap
   • CNotary scheme
   • DInter-Blockchain Communication (IBC)
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   What is the primary purpose of a cross-chain messaging protocol like LayerZero?

   • ATo create a new blockchain that aggregates all other blockchains
   • BTo enable arbitrary data and messages to be sent between different blockchain networks
   • CTo increase the block size of all connected blockchains
   • DTo provide a centralized exchange for cross-chain token swaps
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A multinational supply chain consortium is evaluating Polkadot and Cosmos to connect several independent blockchain networks used by different partners. They want each partner to retain full control over its own network's governance and consensus while still being able to send messages and assets to other networks. Which architecture should they choose?

   • AA single sidechain that all partners validate together
   • BA notary-based bridge between each pair of networks
   • CA single shared blockchain where all partners run nodes
   • DA hub-and-spoke model with a central relay chain and connected parachains
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A financial consortium runs a private Hyperledger Fabric network for interbank settlements and a separate Ethereum-based network for tokenized securities. They want to move a limited set of settlement records from Fabric to Ethereum without exposing the full ledger to either network's validators. Which bridge design best meets this requirement?

   • AA notary scheme with a trusted third-party service that verifies and forwards only the selected settlement records
   • BA generalized message-passing bridge using a relay chain that validates all Fabric blocks
   • CA hash-locked atomic swap between the two networks for each settlement record
   • DA sidechain that maintains a full copy of both networks' state
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   Two users want to exchange 10 BTC for 200 ETH directly without using an exchange. They are on different blockchains and do not trust each other. They want a mechanism where if one party fails to complete the transaction, the other party's funds are automatically returned. Which mechanism should they use?

   • AA notary service that holds both assets until both parties confirm
   • BA sidechain that wraps BTC as an ERC-20 token
   • CA hash time-locked contract (HTLC) atomic swap
   • DA relay chain that processes the trade on a shared network
   Reveal Solution Discussion Select an answer first