Blockchain Test 2

Question 1

Blockchain addresses, or "accounts," are generated in most blockchain designs by:

Accepted Answer

Creating a hash based on a cryptographic public key and various meta data

Answer

The most recent block height hash combined with a cryptographic private key

Answer

A PRNG output guaranteed to be unique

Answer

A server/node timestamp added to a PRNG output

Question 2

The secret, the function, the key, and the _____ are the essential components of any cryptographic system.

Accepted Answer

Hash

Answer

Token

Answer

Cipher

Answer

None of the above

Question 3

How are data blocks "chained" together to ensure transaction integrity?

Accepted Answer

The hash of the previous block is written to the header of the current block

Answer

The hash of the genesis block is kept in all block headers

Answer

The ID of the previous block is stored in the current block

Answer

A public key is stored in each block for data decryption

Question 4

Which of the following can be used to protect anonymity in blockchain applications?

Accepted Answer

End-to-end encryption

Answer

Blockchain-based data cubes

Answer

Cryptographic hashing

Answer

Centralized application hosting

Question 5

What is the main distinction between a blockchain and a blockless solution?

Accepted Answer

Transactions are not verified by the entire network in a blockless environment

Answer

Blockless solutions are less reliable

Answer

Blockless solutions are slower

Answer

Blockless solutions do not work on mobile devices

Question 6

User identity on a blockchain can be unique and safe in its most basic form:

Accepted Answer

Through cryptographic hashing

Answer

By users utilizing permissioned blockchains

Answer

User identity cannot yet be protected on blockchain systems

Answer

By users utilizing public blockchains

Question 7

What factors go into determining the block difficulty in Ethereum?

Accepted Answer

When the period between mined blocks is less than 10 seconds, the Block Difficulty increases, whereas when the duration is more than 20 seconds, it lowers.

Answer

The Ethereum Committee sets the Block Difficulty every two weeks to match the average number of transactions, and it cannot be affected by the network itself.

Answer

When the period between mined blocks is less than 20 seconds, the Block Difficulty increases, while it drops when the duration is more than 60 seconds.

Question 8

The validating nodes run Chaincode, which is a decentralized transactional application. It implements the ____________________, in particular the Init and Invoke functions, as does every chaincode.

What is the actual implementation?

Accepted Answer

Chaincode interface

Answer

SDK

Answer

REST Interface

Answer

EVM

Question 9

Secured ____________Registry of base Hyperledger images and custom images with chaincodes is enabled by the Secure Registry Services. What kind of register is in place?

Accepted Answer

Docker

Answer

VMWare

Answer

Kubenetes

Answer

EVM