CBDE questions • Exam prepare

Exam contains 99 questions

Page 14 of 17

Question 79 🔥

Address.Call vs. Address.Delegatecall:

Which database solution meets these requirements?

A. Address.call() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.delegatecall() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and delegatecall can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

B. Address.delegatecall() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.call() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and call() can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

Discussion of the question

Question 80 🔥

It's not possible to use inheritance from multiple sources in Solidity.

Which database solution meets these requirements?

A. True

B. False

Discussion of the question

Question 81 🔥

Assert is used:

Which database solution meets these requirements?

A. to check internal states that should never happen.

B. to check input arguments from users.

Discussion of the question

Question 82 🔥

.Require is used:

Which database solution meets these requirements?

A. to check internal states that should never happen.

B. to check input arguments from users.

Discussion of the question

Question 83 🔥

Truffle:

Which database solution meets these requirements?

A. is a framework that helps developers with Testing, Deployment and Management of Smart Contracts and Distributed Applications.

B. is a library that helps developers to connect to Ethereum nodes, because it abstracts the JSONRPC interface.

C. is a framework for Java, similar to Web3.js for JavaScript. It's a great way to develop distributed Java enterprise applications.

Discussion of the question

Question 84 🔥

Unit-Testing on a local chain is important, because it helps you:

Which database solution meets these requirements?

A. to run tests quickly and especially for free, compared to continuous deployment on the MainNetwork. This way you save a lot of fees, time and costs.

B. to run tests in an environment where logging is activated. On the Main-Net you have no access to transaction logs and this is ultimately the information you need to debug your contracts.

C. to avoid regression bugs with contracts that are updated constantly on the main-net. Once you update a contract on the main-net, the address stays the same, but the code changes and this can have disastrous side-effects.

Discussion of the question

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blockchain CBDE

Exam contains 99 questions

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