Hyperledger Fabric Architecture and Network Creation BDC Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A client application submits a transaction to a Fabric network. The endorsement policy requires endorsement from at least one peer in OrgA and one peer in OrgB. The transaction is endorsed by the required peers and sent to the ordering service. What happens next in the transaction flow?

   • AThe ordering service sends the transaction back to the endorsing peers for a second round of endorsement before committing.
   • BThe ordering service updates the world state directly and then notifies the client.
   • CThe ordering service orders the transaction into a block and delivers it to all peers on the channel for validation and commit.
   • DThe ordering service delivers the block only to the endorsing peers, which then propagate it to other peers via gossip.
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   Which component in Hyperledger Fabric is responsible for maintaining the blockchain ledger and the current state?

   • AOrdering service
   • BCertificate Authority
   • CChaincode container
   • DPeer nodes
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   In a Fabric network, a client sends a transaction proposal to endorsing peers. After receiving endorsements, the client submits the transaction to the ordering service. What role does the ordering service play in the consensus process?

   • AIt validates the endorsement policy and updates the world state.
   • BIt orders transactions into a sequence and packages them into blocks, but does not execute chaincode.
   • CIt stores the world state for all channels to ensure consistency.
   • DIt executes the chaincode to determine the transaction's outcome before ordering.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What is the purpose of the 'approve' step in the Fabric chaincode lifecycle?

   • ATo start the chaincode container
   • BTo install the chaincode on the peer
   • CTo package the chaincode into a tar file
   • DTo indicate that an organization agrees with the chaincode definition
   Reveal Solution Discussion Select an answer first
6. 25application · easy

   A channel has an endorsement policy that requires endorsement from a majority of organizations in the channel. The channel has three organizations: OrgA, OrgB, and OrgC. A transaction is submitted and endorsed by OrgA and OrgB. Will the transaction be considered valid?

   • ANo, because all organizations must endorse the transaction.
   • BYes, because two out of three organizations is a majority.
   • CYes, but only if OrgA and OrgB are the largest organizations.
   • DNo, because the endorsement must include the organization that submitted the transaction.
   Reveal Solution Discussion Select an answer first