[Q20-Q42] Pass Your Hyperledger Fabric HFCP Exam Easily with Accurate PDF Questions [Jul 29, 2024]

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admin • July 29, 2024

[Q20-Q42] Pass Your Hyperledger Fabric HFCP Exam Easily with Accurate PDF Questions [Jul 29, 2024]

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Pass Your Hyperledger Fabric HFCP Exam Easily with Accurate PDF Questions [Jul 29, 2024]

HFCP Certification Exam Dumps Questions in here

NO.20 Which pluggable component in the Hyperledger Fabric modular architecture is responsible for identities?

Ordering Service

Membership Service Provider

Endorsement Policy

Peer Node

NO.21 What is a range query with a start and end key?

A query that searches for all keys that are in the range defined by the start and end keys.

A query that searches for a specific value in a composite key and all values after it.

A query that searches for ledger entries that have values matching the range.

A query that searches for all the key field in the value.

In Hyperledger Fabric, a range query with a start and end key is a type of query that searches for all ledger entries whose keys fall within the specified range defined by the startKey and endKey. This is used, for example, to retrieve a subset of assets from the ledger based on their key values, effectively iterating over a specified range .

NO.22 In Hyperledger Fabric a transaction is initiated where?

Endorser

IPeer

Client

Orderer

In Hyperledger Fabric, a transaction is initiated by a client application. The client creates a transaction proposal and sends it to endorsing peers. The role of the client is critical as it acts as the initiator of transactions, constructing and proposing transactions to the network for endorsement and then submitting the endorsed transactions to the ordering service for inclusion in the blockchain. The client essentially orchestrates the process of transaction creation, endorsement, and submission, starting the entire transaction flow.

NO.23 In a production environment, what peer items require on-going monitoring?

Only the orderer service since it manages the ordering of transactions.

Only the chaincode containers since they handle the business logic.

All peer containers, including their CPU, network, and memory.

Onlythe peer nodes that are runningchaincode, since they consume most resources.

In a production environment of Hyperledger Fabric, it is essential to monitor all peer containers comprehensively, including their CPU, network, and memory usage. This is because each peer node plays a critical role in maintaining the network’s overall health and efficiency. Monitoring these resources helps in detecting potential bottlenecks or failures early, ensuring the smooth operation of the blockchain network.
Focusing only on specific components like the orderer service or chaincode containers would provide a limited view of the network’s health and could lead to issues being overlooked. Comprehensive monitoring enables administrators to maintain optimal performance and reliability across the entire network.

NO.24 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.25 What is the main purpose of certificates in Hyperledger Fabric?

Certificates are used solely in Transport Layer Security (TLS) protocols, providing the necessary keys.

Providing identity for different actors, helping with ledger consistency, authorization and Transport Layer Security (TLS).

Encrypting the stored ledger data in a way that certain data is visible only to certain organizations.

Certificates are certified digital documents making certain parts of the system transparent.

In Hyperledger Fabric, certificates primarily provide identity for various actors within the network, such as peers, orderers, and clients. These certificates facilitate not just node-to-node communication and data integrity but also contribute significantly to the security measures of the network, such as authentication and authorization processes. Importantly, these certificates are utilized in TLS (Transport Layer Security) protocols to secure communications between nodeson the network. Fabric utilizes X.509 certificates for these purposes, which are issued by a Certificate Authority (CA) within the network .

NO.26 Which subcommand adds a peer to a channel in Hyperledger Fabric?

peer channel fetch

peer channel creace

peer channel updace

peer channel join

In Hyperledger Fabric, the correct subcommand to add a peer to a channel ispeer 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 likepeer channel fetch,peer channel create, andpeer channel updateserve different purposes.peer channel fetchretrieves blocks from a channel,peer channel createis used to set up a new channel, andpeer channel updatemodifies channel settings. Thus,peer channel joinis the specific command used to connect a peer to a channel.

NO.27 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.28 Which is the last step in the Hyperledger Fabric transaction flow?

Endorsing and Ordering

Commitment and notification

Ledger updated and commitment

Endorsingand notification

The last step in the Hyperledger Fabric transaction flow is the commitment of the transaction to the ledger and the subsequent notification to the client application1. Once the transaction has been endorsed and ordered, it is committed to the ledger on all peers. After the transaction is committed, the peers asynchronously notify the client application of the success or failure of the transaction. This ensures that the client application is aware of the outcome and can take appropriate actions based on the result of the transaction1

NO.29 After the transaction that contains the delState(“A”) function is committed, what happens to the ledger and state database?

getstate(“A”) function returns the current state of the key “A”.

The deleting transaction sets an empty value to the key “A” in the write set.

The state of the key “A” is removed from the state database, but its history remains in the ledger.

All transaction histories which updated the state “A” are deleted from the ledger.

In Hyperledger Fabric, when a transaction that includes thedelState(“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 adelState(“A”)operation is that the current state of “A” is deleted, but its transaction history remains accessible in the ledger.

NO.30 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.31 What do we call the ordering nodes actively participating in the consensus mechanism for a given channel and receiving replicated logs for the channel?

Committer set

Consenter set

Peers

Endorsers

In Hyperledger Fabric, the ordering nodes that are actively participating in the consensus mechanism for a given channel are referred to as the “Consenter set.” These nodes are part of the ordering service and are responsible for creating blocks by ordering transactions and ensuring consistency across the network. The Consenter set receives the transaction logs that need to be replicated across other orderers and peers in the network. This is distinct from the “Committer set,” which comprises nodes that commit blocks to their ledger, and “Endorsers,” which are responsible for endorsing transactions by checking them against the chaincode execution policies.

NO.32 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.33 An endorsement policy lists what?

The number of organizations involved in a transaction.

The number of peers needed to endorse a transaction.

The order in which transactions are executed.

The identities required for endorsing a transaction.

In Hyperledger Fabric, an endorsement policy specifies which network participants, identified by their digital identities, must endorse a transaction before it can be considered valid. This is crucial for the network’s security and integrity, as it controls how transactions are approved andadded to the ledger. Endorsement policies are part of the channel configuration and can be customized to fit the specific needs of a business network. They dictate the necessary endorsements from specific organizations or even particular roles within those organizations, ensuring that only authorized entities can validate transactions. This mechanism supports the collaborative yet secure nature of the enterprise blockchain, where trust is decentralized across different organizations that are part of the network.

NO.34 What Fabric Gateway client API call could a client application use to update ledger state?

Evaluate

Invoke

Update

Submit

In the context of the Fabric Gateway client API, the call that a client application would use to update the ledger state is Submit1. The Submit function combines the actions of endorsing a transaction proposal, submitting the transaction to the ordering service, and waiting for the transaction to be committed to the ledger into a single blocking call. This simplifies the process for the client application, allowing it to update the ledger state with a single line of code. The Evaluate call, on the other hand, is used to query the current state of the ledger without making any updates2. There are no Invoke or Update calls in the Fabric Gateway client API as per the official documentation

NO.35 What is the only way to recover from a failed migration from Kafka to Raft?

Retry the migration from Kafka to Raft.

Restore the state from a backup.

Revert to the previous version of Kafka.

Rebuild the network from scratch.

Recovering from a failed migration from Kafka to Raft in Hyperledger Fabric involves restoring the state from a backup. This is necessary because once the ordering service is migrated to Raft and begins committing transactions, reverting to Kafka is not supported without a previous backup. If a migration is botched, and a backup was made at the appropriate point, administrators can roll back to this backup to restore the system to its pre-migration state .

NO.36 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.37 What gRPC status code might you expect to be associated with an error invoking a transaction as a result of a transient failure, such as a network disconnection between the client application and Gateway peer?

UNAVAILABLE

ABORTED

DEADLINE EXCEEDED

FAILED PRECONDITION

The gRPC status code “UNAVAILABLE” is commonly expected in scenarios involving transient failures in network communication, such as a disconnection between the client application and the Gateway peer. This status code indicates that the service is currently unavailable, often due to network issues or service downtime, making it suitable for situations where the failure is temporary and the request can be retried. This differs from other codes like “ABORTED” or “DEADLINE EXCEEDED,” which represent different types of errors related to the transaction logic or timing issues, respectively. “FAILED PRECONDITION” would be inappropriate for network disconnections as it suggests issues with the request’s preconditions, not the network status.

NO.38 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.39 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.40 Which channel feature allows organizations to run different versions of Hyperledger Fabric on their peer nodes?

Endorsement policies

Channel capabilities

Consensus protocols

Anchor peers

Hyperledger Fabric allows different versions of the platform to coexist and interoperate on the same network through the use of channel capabilities. Channel capabilities enable organizations running different versions of Fabric binaries to participate on the same channel. These capabilities govern the features that are used by peer nodes and set the minimum version of the Fabric binaries that can be run by peers joined to the channel. This allows for heterogeneousnetwork environments where different nodes might be running different versions of Fabric software .

NO.41 In Hyperledger Fabric, Intercommunication is how a smart contract in a channel updates the World State database. It is achieved by what process?

Setting the endorsement policy to communicate with all peers.

Configuring the Peer-to-peer endorsement options.

Calling smart contracts within the channel and in different channels.

Making use of the cross channel Consensus mechanism.

Intercommunication in Hyperledger Fabric regarding how smart contracts update the World State database is primarily achieved by calling other smart contracts, both within the same channel and across different channels. This process allows smart contracts, also known as chaincode, to interact and transact across the network, updating the World State as necessary based on business logic defined in the contracts. This capability is crucial for complex business processes that span multiple contracts and possibly multiple channels. Unlike setting endorsement policies or configuring peer-to-peer options, calling other smart contracts directly facilitates dynamic and direct interaction between business processes, enhancing the modularity and efficiency of the network. Cross-channel communication must be carefully managed within the permissions and policies defined in the network to maintain security and integrity.

NO.42 What is true about the historic states in Hyperledger Fabric model?

They can be modified by anyone with write access.

Administrator role is required for access.

They are immutable.

They cannot be accessed by anyone.

Historic states in the Hyperledger Fabric ledger are immutable, meaning they cannot be altered after they have been committed to the ledger. This immutability ensures the integrity and traceability of all transactions on the network. Once a transaction is recorded, it is permanent, and its history can be audited to trace back all operations affecting any piece of data. This feature is fundamental in blockchain technology, providing a verifiable and tamper-evident record. The immutability of historic states is a key component of the trust and security model in Hyperledger Fabric, contrary to options that suggest these records can be modified or are inaccessible.

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