Linux Foundation HFCP Exam Practice Test Instant Access

Question 1

In Raft, there are two places for configuration. One is local configuration. What is the other?

AGlobal configuration

BChannel configuration

CConsensus configuration

DPeer configuration

Answer : B

In Raft, configuration occurs at two levels: local and channel. The local configuration pertains to node-specific settings such as TLS communication and file storage. The channel configuration, on the other hand, defines the membership and operational parameters of the Raft cluster for a specific channel, including settings like heartbeat frequency and leader timeouts. This dual-level configuration allows for precise control over the behavior of Raft nodes within the Hyperledger Fabric network .

Question 2

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

Apeer channel fetch

Bpeer channel creace

Cpeer channel updace

Dpeer channel join

Answer : D

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.

Question 3

How can the client application access descriptive error text for each of the endorsing peers following a transaction endorsement failure?

AExtract relevant entries from the endorsing peer logs.

BExamine the message of the associated cause or wrapped error.

CLook up the gRPC status code for the error.

DExtract the details associated with the returned error.

Answer : D

When a client application encounters a transaction endorsement failure in Hyperledger Fabric, the most effective way to access descriptive error text for each endorsing peer is to extract the details associated with the returned error. This error information typically includes details about why the endorsement was unsuccessful, providing insights into issues such as policy violations or execution failures. This method is more direct and informative compared to extracting logs or examining generic error messages and helps developers and administrators quickly diagnose and address issues in transaction processing.

Question 4

Which actions are combined into a single function by the Fabric Gateway client APIs to support transaction submission with a single line of code?

AValidation and Commitment

BEndorsement, Submit, and Commitment

COrdering and Commitment

DEndorsement and Commitment

Answer : B

The Fabric Gateway client APIs in Hyperledger Fabric streamline the transaction submission process by combining endorsement, submission, and commitment into a single function. This allows client applications to efficiently manage transaction submissions with a single line of code, specifically through the SubmitTransaction() function. This consolidation simplifies the interaction model for applications, enabling a focus on business logic rather than the underlying blockchain infrastructure details .

Question 5

How should private data collection be configured and deployed?

APrivate data collection is configured and deployed with the help of a dedicated REST API that is available on the orderers.

BPrivate data collection configuration is setup at the core network structure configuration with the components.

CPrivate data collection is configured at the X5C9 certification generation process of the certificate authorities.

DPrivate data collection configuration is described in a separate ison file and deployed at chaincode deployment.

Answer : D

In Hyperledger Fabric, private data collections are configured using a separate JSON file that describes the details of the collection, such as the name, policy, and member organizations that have access to it. This configuration file is included during the chaincode deployment process. The collections configuration file defines how private data is managed, including its lifecycle, storage, and dissemination between authorized peers. By configuring private data collections in this manner, organizations ensure that sensitive information is only accessible to specific participants in the network, thus maintaining confidentiality and compliance with data governance standards.

Question 6

What happens if the user submits a transaction with no matching function?

AThe peer will have rejected the transaction.

BNothing, the transaction is ignored.

CThe first transaction function is called.

DThe unknownTransaction function is called.

Answer : D

In Hyperledger Fabric, if a user submits a transaction with no matching function specified in the smart contract, the unknownTransaction function is invoked by default. This function serves as a catch-all method that can be used to handle cases where the transaction type is not recognized, providing a mechanism to manage or log these occurrences effectively .

Question 7

How would a developer iteratively test and develop a smart contract without the overhead of the smart contract lifecycle process for every update?

ARunning chaincode for Smart Contracts in development mode.

BManually update the Smart Contract code on the network.

CDeploy the Smart Contract on the network for every update.

DUse a Production Network to test and develop Smart Contracts.

Answer : A

For developers looking to iteratively test and develop smart contracts in Hyperledger Fabric without the overhead of the full lifecycle process for each update, the recommended approach is to run the chaincode in development mode. This mode allows developers to test and debug chaincode directly on their machines without having to package, install, approve, and commit changes on the network each time. Development mode simplifies the iterative development process by allowing direct interaction with the chaincode during its development, making it easier to make and test changes quickly and efficiently. This contrasts with other methods that involve manual updates, redeployments, or using a production network, all of which are more time-consuming and complex.

Linux Foundation HFCP Hyperledger Fabric Certified Practitioner Exam Practice Test