Cross-Chain Communication and Interoperability Protocols BBLC Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which mechanism is used in an atomic swap to ensure that the transaction is either fully completed or not at all?

   • ASmart contract oracle
   • BProof-of-stake consensus
   • CMulti-signature wallet
   • DHash time-locked contract (HTLC)
   Reveal Solution Discussion Select an answer first
2. 12expert · hard

   A consortium of banks wants to bridge their private permissioned networks to a public blockchain for asset settlement. They are concerned about the security of the bridge and want to ensure that a single compromised validator cannot steal funds. They also want to minimize operational overhead. Which bridge design should they choose?

   • AA sidechain with a centralized operator that holds all bridged assets
   • BA light-client bridge that verifies the source chain's consensus on the destination chain
   • CA federated bridge with a 5-of-7 multi-signature scheme and regular audits
   • DA notary bridge operated by a single trusted bank
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   A multinational enterprise wants to connect its private blockchain to multiple public chains for supply chain tracking. The enterprise requires that messages between chains are verified without relying on a single trusted intermediary, and the solution must be able to scale to many chains. Which approach best meets these requirements?

   • AA hub-and-spoke model using a relay chain with connected parachains
   • BA network of notary bridges between each pair of chains
   • CA single sidechain that connects to all public chains
   • DA custom atomic swap for each message
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   In the Polkadot ecosystem, what is the role of the relay chain?

   • ATo provide shared security and consensus for connected parachains
   • BTo execute smart contracts for all parachains
   • CTo store all application data for each parachain
   • DTo serve as a bridge to external networks like Ethereum
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A DeFi protocol wants to enable users on Ethereum to trigger smart contract functions on a separate Avalanche subnet. The protocol needs a general-purpose messaging mechanism that can carry arbitrary data and function calls, not just token transfers. Which approach should they use?

   • AA custom atomic swap for each function call
   • BA notary service that manually forwards transactions
   • CA cross-chain messaging protocol like LayerZero or IBC
   • DA sidechain that replicates the entire Avalanche state on Ethereum
   Reveal Solution Discussion Select an answer first