Linux Foundation HFCP Exam Practice Test Instant Access

Question 1

Which channel feature allows organizations to run different versions of Hyperledger Fabric on their peer nodes?

AEndorsement policies

BChannel capabilities

CConsensus protocols

DAnchor peers

Answer : B

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 heterogeneous network environments where different nodes might be running different versions of Fabric software .

Question 2

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?

AUNAVAILABLE

BABORTED

CDEADLINE EXCEEDED

DFAILED PRECONDITION

Answer : A

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.

Question 3

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 4

Which pluggable component in the Hyperledger Fabric modular architecture is responsible for identities?

APeer Node

BMembership Service Provider

CEndorsement Policy

DOrdering Service

Answer : B

In Hyperledger Fabric's modular architecture, the Membership Service Provider (MSP) is the pluggable component responsible for handling identities. The MSP abstracts the identity validation and authentication processes, allowing organizations to implement their preferred identity services while maintaining interoperability within the network. It defines the rules by which identities are validated, issued, and revoked. This component is essential for the permissioned nature of Hyperledger Fabric, ensuring that only authorized participants can execute specific actions on the network.

Question 5

Which of the following information do signature policies provide when creating a network in Hyperledger Fabric?

AIdentity specific users who must sign in order to satisfy a policy.
B Number of nodes in the network

CPrivate keys of all network participants.

DType of consensus algorithm used

Answer : A

In Hyperledger Fabric, signature policies specify the identities of specific users who must sign a transaction for it to be considered valid. These policies define the endorsement rules associated with a chaincode and are a critical component of the transaction flow. They ensure that transactions are endorsed by the correct entities as stipulated by the governance of the network. Signature policies are not related to the number of nodes, private keys of participants, or the type of consensus algorithm used but are strictly about defining which users or member organizations' signatures are required to fulfill transaction criteria.

Question 6

What should be taken into account at implementing efficient CouchDB queries from chaincode?

AUsing OLAP (Online analytical processing) and Cube functionality of CouchDB is enough to implement efficient queries.

BUsing complex indexes for certain columns is enough even if full scan operators like $or, $in and $regex are used.

CUsing indexes, focusing on simple queries and avoiding full index scans like with operators $or, $in and $regex.

DUsing advanced relational algebra and SQL query language options of CouchDB is enough to implement efficient queries.

Answer : C

When implementing efficient CouchDB queries from chaincode in Hyperledger Fabric, it is important to use indexes effectively and focus on crafting simple queries that avoid full index scans. Operators such as $or, $in, and $regex can lead to performance issues because they often result in full scans of the database or index. Instead, it is recommended to structure queries that make optimal use of indexes, targeting specific key-value pairs or ranges to minimize the amount of data scanned during query execution. This approach helps in maintaining high query performance and reducing the load on the CouchDB database, which is crucial for achieving efficient data retrieval in a blockchain environment.

Question 7

What is true about the historic states in Hyperledger Fabric model?

AThey can be modified by anyone with write access.

BAdministrator role is required for access.

CThey are immutable.

DThey cannot be accessed by anyone.

Answer : C

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.

Linux Foundation Hyperledger Fabric Certified Practitioner HFCP Exam Practice Test