2024 Correct Practice Tests of HFCP Dumps with Practice Exam [Q37-Q51]

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2024 Correct Practice Tests of HFCP Dumps with Practice Exam

Certification Sample Questions of HFCP Dumps With 100% Exam Passing Guarantee

NO.37 Each peer in the Hyperledger Fabric network hosts a copy of the ledger, which also belongs to what component?

The membership services

The Ordering node

The NoSQL databases

A member channel

In Hyperledger Fabric, each peer in the network hosts a copy of the ledger, which is associated with a member channel. The ledger itself is comprised of a blockchain to store the immutable, sequenced record in blocks, and a state database to maintain the current state of the ledger. There is one ledger per channel, and each peer maintains a copy of the ledger for each channel of which they are a member .

NO.38 A smart contract can call other smart contracts both within the same channel and across different channels.
Which of the following transactions is inter-contract communication whose functionality is limited?

Chaincode X calls Getstate in Chaincode Y on the same channel.

Chaincode X calls Putstate in Chaincode Y on the same channel.

Chaincode X calls Getstate in Chaincode Y on a different channel.

Chaincode X calls Putstate in Chaincode Y on a different channel.

In Hyperledger Fabric, inter-contract communication is possible both within the same channel and across different channels. However, the functionality to alter the state (usingPutState) of a chaincode on a different channel is restricted. This limitation is due to the security and isolation principles of channels in Hyperledger Fabric, where each channel represents a separate ledger and state. Transactions within a channel can read and write data freely, subject to endorsement policies, but writing data to another channel’s chaincode directly is not permitted. This prevents unauthorized influence on a separate and potentially isolated business process, ensuring that operations within a channel are controlled and secure.

NO.39 For an endorsed transaction, the gateway service forwards the transaction to the ordering service, which orders it with other endorsed transactions and then completes what?

Sends the transaction to the validation phase.

Packages all endorsed transactions into a block.

Sends the transaction to the endorsement phase.

Broadcasts the transaction to all peers in the channel.

For an endorsed transaction, the gateway service forwards the transaction to the ordering service. The ordering service then packages this transaction with other endorsed transactions into a block. This block is subsequently distributed across the network to all peers for validation and commitment to the ledger. The ordering process ensures the maintenance of transaction order across the network, crucial for the consistency and integrity of the blockchain .

NO.40 Which are the transaction steps that are managed by the Fabric gateway service?

Finding a nonce for a pre-image of a hash function for mining.

Collect transactions into a block and eliminating invalid transactions.

Evaluate, endorse, submit, and get commit status.

Realizing a distributed verifiable random function for leader election.

The transaction steps managed by the Fabric gateway service in Hyperledger Fabric are to evaluate, endorse, submit, and obtain the commit status of transactions. This service simplifies the process for clients by handling these critical transaction steps, which facilitates more efficient transaction processing and management within the network .

NO.41 What is necessary for a chaincode to become ready to commit on a channel?

The chaincode must be previously installed on the channel’s peers.

The policy Channel/Application/Writers must be satisfied.

The policy /Channel/Application/LifecycleEndorsement must be satisfied.

The chaincode must have the endorsement policies correctly defined.

For a chaincode to become ready to commit on a channel in Hyperledger Fabric, it is necessary that the policy
“/Channel/Application/LifecycleEndorsement” be satisfied. This policy specifies who needs to approve the chaincode definition before it can be committed to the channel. It ensures that the chaincode deployment is endorsed according to the governance standardsagreed upon by the network participants, typically requiring a majority or other specified fraction of the organizations in the network to endorse the change. This lifecycle endorsement policy is key to maintaining a secure and agreed-upon update process for chaincodes on the channel.

NO.42 In Hyperledger Fabric, what data structures manage sensitive information between organizations?

Private data collections

State database

Ordering service

Endorsement policies

In Hyperledger Fabric, “private data collections” are used to manage sensitive information between organizations. This feature allows specified subsets of data to be shared among a defined group of network participants while keeping it hidden from others, thus maintaining confidentiality and privacy across the network. Private data collections enable organizations to transact privately without having to establish a separate channel, significantly reducing the overhead associated with channel management .

NO.43 Which actions are combined into a single function by the Fabric Gateway client APIs to support transaction submission with a single line of code?

Validation and Commitment

Endorsement, Submit, and Commitment

Ordering and Commitment

Endorsement and Commitment

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 .

NO.44 What is the purpose of the ordering service in Hyperledger Fabric model?

To endorse transactions and update the world state.

To manage the identities of the participants in the network

To assemble transactions into blocks for the blockchain ledqer.

To validate transactions and maintain the blockchain ledqer

The primary purpose of the ordering service in Hyperledger Fabric is to assemble transactions into blocks and ensure their correct sequencing on the blockchain ledger. This service takes validated transactions, orders them chronologically, and packages them into blocks. These blocks are then distributed to all peers on the network for final validation and commitment to their respective ledgers. This process is crucial for maintaining the integrity and consistency of the ledger across the distributed network. The ordering service does not manage identities or endorse transactions, nor does it validate transactions or directly maintain the blockchain ledger beyond the sequencing and packaging of transactions.

NO.45 The peer and the orderer host an HTTP server that offers a RESTful operations API (Operations Service).
Which of the following function is unprovided as an Operation Service API?

Get log data

Get metrics

Set log level

Do health check

The Operations Service API hosted on the HTTP server by the peer and the orderer in Hyperledger Fabric does not provide the functionality to set the log level. This API is primarily designed to offer operational insights and controls like retrieving log data, fetching metrics, and performing health checks. The ability to dynamically adjust the log level via this API is not supported, as logging levels are typically configured statically through configuration files or environment variables at the time of node startup. This design helps maintain the integrity and stability of the operational log data.

NO.46 When creating a gRPC connection to the Gateway peer using Transport Layer Security (TLS), what information must be supplied by the client application?

The Gateway peer host name, service port number, and a TLS host name override.

A common connection profile that includes the Gateway peer address and TLS certificate.

The endpoint address of the Gateway peer and the certificate of the TLS certificate authority.

The client private key and the public key of the TLS certificate authority.

When creating a gRPC connection to the Gateway peer in Hyperledger Fabric using Transport Layer Security (TLS), the client application must supply the endpoint address of the Gateway peer and the certificate of the TLS certificate authority. This configuration is essential to establish a secure communication channel. The endpoint address specifies where the Gateway peer is located, which the client uses to connect. The certificate of the TLS certificate authority is crucial for validating the identity of the Gateway peer, ensuring that the connection is secure and that the data being transmitted is encrypted. This setup helps prevent man-in-the-middle attacks and ensures that sensitive data remains confidential during transmission.

NO.47 Which of the following statements describes Chaincode correctly?

Chaincode is software for creating new blocks on the ledger.

Chaincode is software defining assets and transaction instructions for modifying the assets on the ledger.

Chaincode is a legally enforceable business contract between organizations.

Chaincode is a code of conduct to manage a blockchain consortium.

Chaincode in Hyperledger Fabric is essentially smart contract software that defines assets and the transaction instructions for modifying these assets on the ledger. Chaincode functions as the business logic layer of the network, where the rules for interacting with the ledger are specified. It is executed on the network peers and is used to encode the policies and constraints associated with asset exchanges or updates within the business network. This setup allows organizations to automate processes and enforce consistency and compliance across transactions.

NO.48 When submitting a transaction, how can a client application send information to be stored only in a private data collection?

Transfer it using an off-chain data store.

Encrypt it using the client private key.

Send it as a chaincode event.

Include it as transient data.

In Hyperledger Fabric, to send information that should be stored only in a private data collection during a transaction submission, the information must be included as transient data. Transient data is sent along with the transaction proposal but is not recorded on the ledger; instead, it is used within the chaincode for processing and can then be stored in private collections as needed. This method ensures that sensitive information is kept out of the public ledger and is only available to authorized parties as defined in the private data collection configuration. Transient data provides a secure way to handle sensitive or confidential information within the network without exposing it on the shared ledger.

NO.49 Which directory is created by the idemixgen tool along with the ca directory and msp directory when configuring membership?

config directory

user directory

orderer directory

tlscacerts directory

The idemixgen tool is used to create configuration files for the Identity Mixer based MSP (Membership Service Provider) in Hyperledger Fabric. When configuring membership, the idemixgen tool creates three directories: /ca/, /msp/, and /user/1. The /ca/ directory contains the issuer secret key, issuer public key, and revocation key, which should only be present for a Certificate Authority (CA). The /msp/ directory contains the issuer public key and revocation public key, which are required to set up an MSP that verifies Identity Mixer signatures. The /user/ directory specifies a default signer configuration1. Therefore, the correct answer is the user directory, which is created alongside the ca and msp directories by the idemixgen tool.

NO.50 Regarding peerlifecycle chaincode, which of the following is the incorrect (unsupported) subcommand for query?

peer lifecycle chaincode querypackaged

peer lifecycle chaincode querycommitted

peer lifecycle chaincode queryapproved

peer lifecycle chaincode queryinstalled

The correct subcommands for querying in the peer lifecycle chaincode
are queryinstalled, queryapproved, checkcommitreadiness, commit, and querycommitted1. The subcommand querypackaged is not a supported subcommand for querying in the peer lifecycle chaincode.

NO.51 Which pluggable component in the Hyperledger Fabric modular architecture is responsible for identities?

Ordering Service

Membership Service Provider

Endorsement Policy

Peer Node

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