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Frequently Asked Questions

Linux Foundation HFCP Sample Question Answers

Question # 1

A smart contract can call other smart contracts both within the same channel and acrossdifferent channels. Which of the following transactions is inter-contract communicationwhose functionality is limited?

A. Chaincode X calls Getstate in Chaincode Y on the same channel.
B. Chaincode X calls Putstate in Chaincode Y on the same channel.
C. Chaincode X calls Getstate in Chaincode Y on a different channel.
D. Chaincode X calls Putstate in Chaincode Y on a different channel.

Question # 2

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

A. Using OLAP (Online analytical processing) and Cube functionality of CouchDB isenough to implement efficient queries.
B. Using complex indexes for certain columns is enough even if full scan operators like $or,$in and $regex are used.
C. Using indexes, focusing on simple queries and avoiding full index scans like withoperators $or, $in and $regex.
D. Using advanced relational algebra and SQL query language options of CouchDB isenough to implement efficient queries.

Question # 3

What is the difference between chaincode, transaction, and block events?

A. Use setEvent, setTransactionEvent, setBlockEvent to emit chaincode, transaction and block events in the chaincode.
B. Chaincode events must be programmed in the smart contract, transaction and blockevents work out of the box
C. They are pretty much the same both regarding functionality and programming effort aswell.
D. Block events must be programmed in the smart contract, chaincode events work out ofthe box.

Question # 4

What is the difference between chaincode, transaction, and block events?

A. Use setEvent, setTransactionEvent, setBlockEvent to emit chaincode, transaction and block events in the chaincode.
B. Chaincode events must be programmed in the smart contract, transaction and blockevents work out of the box
C. They are pretty much the same both regarding functionality and programming effort aswell.
D. Block events must be programmed in the smart contract, chaincode events work out ofthe box.

Question # 5

What is the role of the endorsement policy in the context of Hyperledger Fabric'schaincode?

A. Define which organizations are allowed to read the ledger.
B. Define the organizations that have permission to execute a transaction.
C. Define which orderers will order transactions into a block.
D. Define the organizations that must sign a transaction proposal.

Question # 6

Which directory is created by the idemixgen tool along with the ca directory and mspdirectory when configuring membership?

A. config directory
B. user directory
C. orderer directory
D. tlscacerts directory

Question # 7

When submitting a transaction, how can a client application send information to be storedonly in a private data collection?

A. Transfer it using an off-chain data store.
B. Encrypt it using the client private key.
C. Send it as a chaincode event.
D. Include it as transient data.

Question # 8

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

A. Extract relevant entries from the endorsing peer logs.
B. Examine the message of the associated cause or wrapped error.
C. Look up the gRPC status code for the error.
D. Extract the details associated with the returned error.

Question # 9

Each peer in the Hyperledger Fabric network hosts a copy of the ledger, which alsobelongs to what component?

A. The membership services
B. The Ordering node
C. The NoSQL databases
D. A member channel

Question # 10

What is the purpose of the ordering service in Hyperledger Fabric model?

A. To endorse transactions and update the world state.
B. To manage the identities of the participants in the network
C. To assemble transactions into blocks for the blockchain ledqer.
D. To validate transactions and maintain the blockchain ledqer

Question # 11

What gRPC status code might you expect to be associated with an error invoking atransaction as a result of a transient failure, such as a network disconnection between theclient application and Gateway peer?

A. UNAVAILABLE
B. ABORTED
C. DEADLINE EXCEEDED
D. FAILED PRECONDITION

Question # 12

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

A. crypto-config.yaml
B. docker-compose.yaml
C. configtx.yaml
D. orderer.yaml

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