What is the primary purpose of a Corda contract's verify() method?

To define the state's participants

To store the transaction on the ledger

To enforce the business rules of the transaction

To ensure the transaction is signed by all participants

What is the purpose of the DriverDSL in Corda testing?

To run integration tests with real Corda nodes

To mock the network map service

A developer is writing a flow that must handle a scenario where the counterparty rejects the transaction. The flow should be able to retry with a different set of inputs. What is the best approach?

Use a flow that sends the transaction to the counterparty and waits for a response, then manually retries if rejected

Use a flow that does not handle the rejection and lets the flow fail

Catch the FlowException and retry the flow with different inputs

Use a sub-flow that handles the rejection and automatically retries

A developer is writing a unit test for a flow that issues a new BondState. The test uses MockNetwork and a StartedMockNode. The flow returns a SignedTransaction. The developer wants to assert that the transaction is recorded in the node's vault. Which test assertion is appropriate?

Assert that the node's storage service contains the transaction by calling node.database.transactionRepository.

Assert that the BondState is present in the node's vault by querying the vault service with a QueryCriteria.

Assert that the SignedTransaction's id is present in the node's transaction storage using node.transactionStorage

Assert that the flow's result future completes without exception; that is sufficient to confirm recording.

EC-CouncilBlockchain Developer Certification

Domain 8Objective 4

CorDapp Development and Lifecycle BDC Practice Questions (Page 1)

Part of the Enterprise Blockchain Platforms domain, which makes up ~10% of our current practice bank.

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Questions 1–5

1foundation · easy
What is the primary purpose of a Corda contract's verify() method?
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2foundation · easy
What is the purpose of the DriverDSL in Corda testing?
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3foundation · easy
In a Corda CorDapp, which component is responsible for defining the rules that govern how a transaction is validated?
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4expert · hard
A developer is writing a flow that must handle a scenario where the counterparty rejects the transaction. The flow should be able to retry with a different set of inputs. What is the best approach?
Select an answer first
5application · medium
A developer is writing a unit test for a flow that issues a new BondState. The test uses MockNetwork and a StartedMockNode. The flow returns a SignedTransaction. The developer wants to assert that the transaction is recorded in the node's vault. Which test assertion is appropriate?
Select an answer first

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