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Free Linux Foundation HFCP Exam Questions (page: 3)

Page 3 of 16
PDF with 60 Questions

Regarding peer lifecycle chaincode, which of the following is the incorrect (unsupported) subcommand for query?

  1. peer lifecycle chaincode querypackaged
  2. peer lifecycle chaincode querycommitted
  3. peer lifecycle chaincode queryapproved
  4. peer lifecycle chaincode queryinstalled

Answer(s): A

Explanation:

The correct subcommands for querying in the peer lifecycle chaincode arequeryinstalled,queryapproved,checkcommitreadiness,commit, andquerycommitted1. The subcommandquerypackagedis not a supported subcommand for querying in the peer lifecycle chaincode.



When deploying an Orderer environment, variables must be customized or overridden in which artifact?

  1. crypto-config.yaml
  2. docker-compose.yaml
  3. configtx.yaml
  4. orderer.yaml

Answer(s): D

Explanation:

When deploying an Orderer environment in Hyperledger Fabric, the primary configuration file that must be customized or overridden is orderer.yaml. This file contains the configuration settings specifically for the orderer node, including general ledger type, consensus type, and various operational settings like batching, timeouts, and MSP configurations. Other files like crypto-

config.yaml, docker-compose.yaml, and configtx.yaml serve different roles. crypto-config.yaml is used for generating cryptographic material, docker-compose.yaml for defining services, networks, and volumes for containers, and configtx.yaml for channel configuration and consortium definitions. Therefore, orderer.yaml is critical for setting up the orderer's behavior and parameters in the network environment.



Which subcommand adds a peer to a channel in Hyperledger Fabric?

  1. peer channel fetch
  2. peer channel creace
  3. peer channel updace
  4. peer channel join

Answer(s): D

Explanation:

In Hyperledger Fabric, the correct subcommand to add a peer to a channel is peer channel join. This command is used by a peer node to join an existing channel. The command requires a block to be specified which typically is the genesis block of the channel, allowing the peer to synchronize with the channel's ledger from the beginning. Other commands like peer channel fetch, peer channel create, and peer channel update serve different purposes. peer channel fetch retrieves blocks from a channel, peer channel create is used to set up a new channel, and peer channel update modifies channel settings. Thus, peer channel join is the specific command used to connect a peer to a channel.



After the transaction that contains the delState("A") function is committed, what happens to the ledger and state database?

  1. getstate("A") function returns the current state of the key "A".
  2. The deleting transaction sets an empty value to the key "A" in the write set.
  3. The state of the key "A" is removed from the state database, but its history remains in the ledger.
  4. All transaction histories which updated the state "A" are deleted from the ledger.

Answer(s): C

Explanation:

In Hyperledger Fabric, when a transaction that includes the delState("A") function is committed, it results in the removal of the state of the key "A" from the current state database. However, the history of all transactions that have affected the key "A" remains intact in the ledger. This operation ensures that while the current state reflects the deletion, the immutability and traceability of the ledger are preserved, allowing for auditability and verification of past states. Options such as setting an empty value to the key or altering the transaction history are not supported, as they would violate the principles of immutability and transparency central to blockchain technology. Therefore, the correct outcome of a delState("A") operation is that the current state of "A" is deleted, but its transaction history remains accessible in the ledger.



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