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Questions # 41:

In regards to Fabric blockchain blocks. The structure of a "block header" consists of three sections when it is written. (Select three.)

Options:

Block Data

Block Number

Current Block Hash

Previous Block Hash

Block Metadata

Signature

Answer

B, C, D

Explanation

Let’s have a closer look at the structure of a block. It consists of three sections Block Header This section comprises three fields, written when a block is created. Block number: An integer starting at 0 (the genesis block), and increased by 1 for every new block appended to the blockchain. Current Block Hash: The hash of all the transactions contained in the current block. Previous Block Hash: A copy of the hash from the previous block in the blockchain.

References:

Questions # 42:

What Hyperledger sponsored tool is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing the time and complexity of development.

The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming) details involved in blockchain networks?

Options:

Hyperledger Quilt

Hyperledger Composer

Hyperledger Explorer

Hyperledger Cello

Answer

Explanation

There is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing the time and complexity of development. The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming) details involved in blockchain networks.

Questions # 43:

Hyperledger Fabric Consensus is planned out into 3 phases. Which one is NOT a phase?

Options:

Ordering

Endorsement

Voting

Validation

Answer

Questions # 44:

The concept of a node is common in most blockchains. Which of the following about nodes is INCORRECT?

Options:

Nodes need a valid certificate to be able to communicate to the network

Nodes connect to other nodes and that is how a blockchain is formed

These three types of nodes. Client, peer and Ordered

Nodes use a type of client server protocol for keeping the distributed ledger in sync across the network

Answer

Explanation

Nodes use a Peer to Peer protocol not a Client Server. The concept of node is common in all blockchain technologies. The “Node” becomes the communication end point in blockchain technology. Nodes connect to other nodes and that is how a blockchain is formed. Nodes use a type of peer-to-peer protocol for keeping the distributed ledger in sync across the network.

Questions # 45:

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