Blockchain BTA Certified Blockchain Developer - Ethereum - CBDE 模擬練習

A. the Dagger-Hashimoto hashing while internally the EVM uses Keccack256 which is almost similar to SHA256, but has a different padding so produces different hashes.

B. the Dagger-Hashimoto hashing while internally the EVM uses SHA256 which is an alias for Keccack256.

C. Keccack256 while internally to hash values it's easy to use the Dagger-Hashimoto to create a meaningful hash.

A. all public and private state variables, public, internal and external functions, but not modifiers

B. all public state variables and properties, public functions and modifiers, but not internal, external or private ones.

C. all public state variables and properties, public and internal functions and modifiers.

A. ERC are here to define standards for the usage of Ethereum. EIP are here to improve the Ethereum Protocol itself.

B. ERC are an open platform to discuss continuous forking of the Ethereum platform. Successful forks are then incorporated in the EIP for further voting by the Ethereum Consortium.

C. ERC are here to propose new distributed applications on top of the Ethereum layer, while EIP are here to improve existing mining software.

A. The tokens of a certain ERC20 symbol are all the same, the tokens of an ERC721 symbol are all different. So, ERC20 tokens are fungible, while ERC721 tokens are non-fungible.

B. The tokens of a certain ERC20 symbol are all different, the tokens of an ERC721 symbol are all the same. So, ERC20 tokens are non-fungible while ERC721 tokens are fungible.

A. to sum up all ethers sent from that address.

B. to have an additional checksum for transactions.

C. to protect against replay attacks.

A. only interacting with an already deployed smart contract.

B. no matter the content.

C. only with a new smart contract deployment.