Hyperledger Fabric Architecture and Network Creation BDC Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   A Fabric network uses CouchDB as the state database. A chaincode query needs to find all assets whose owner is 'Org1' and whose value is greater than 100. The query should be executed efficiently against the current state. What is the best approach?

   • AUse the peer chaincode query command to fetch all assets and filter them in the client application.
   • BUse the GetHistoryForKey API to retrieve the history of each asset and filter by owner and value.
   • CUse a CouchDB JSON query from chaincode with the selector {owner: 'Org1', value: {$gt: 100}}.
   • DUse the GetStateByRange API to iterate over all keys and check the owner and value.
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   An organization is joining an existing Fabric network. The network administrator has generated the organization's certificates and MSP. What must be done to allow the new organization to participate in a channel?

   • AAdd the organization's MSP to the channel configuration and update the channel.
   • BInstall the organization's MSP on all existing peers in the network.
   • CCreate a new channel for the organization and migrate all data.
   • DRestart the ordering service to recognize the new organization.
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A Fabric network has a peer that is configured as an endorsing peer for a chaincode. The peer receives a transaction proposal from a client. What is the peer's responsibility during the endorsement phase?

   • AOrder the transaction with other transactions and create a block.
   • BStore the transaction in the blockchain and update the world state immediately.
   • CExecute the chaincode against its local state and return a read-write set and endorsement signature.
   • DValidate the transaction against the endorsement policy and commit it to the ledger.
   Reveal Solution Discussion Select an answer first
5. 34expert · hard

   A new organization wants to join an existing Fabric network. The network currently has three organizations. What is the correct sequence of steps to add the new organization to the network and allow it to participate in an existing channel?

   • AGenerate the organization's cryptographic material, update the network's system channel configuration to include the new MSP, then update the application channel configuration to add the organization, and finally have the new organization's peers join the channel.
   • BCreate a new channel for the new organization and have its peers join that channel.
   • CUse the peer channel update command to add the new organization's peer directly to the channel.
   • DInstall the new organization's MSP on all existing peers and then use the peer channel join command on the new peer.
   Reveal Solution Discussion Select an answer first
6. 35foundation · easy

   Where does chaincode run in a Hyperledger Fabric network?

   • AOn a separate chaincode server
   • BOn the peer nodes that have it installed
   • COn the client application
   • DOn the ordering service
   Reveal Solution Discussion Select an answer first