In a peer-to-peer (P2P) network, how do nodes communicate?

Using a broadcast protocol that requires a central coordinator

Directly with each other without a central intermediary

Only through a designated leader node

Through a central server that relays all messages

A developer is explaining the architecture of a blockchain to a business stakeholder. The stakeholder asks, 'Where does the application logic that runs on the blockchain live?' Which answer is correct?

In the block header, alongside the timestamp and nonce.

In the consensus protocol, which defines the rules for adding blocks.

In the peer-to-peer network layer, which handles communication.

In smart contracts, which are stored on the blockchain and executed by nodes.

A consortium of 50 healthcare providers wants to share patient records on a permissioned blockchain. They require high throughput, low latency, and the ability to revoke access to a participating node that violates data-sharing policies. Which consensus mechanism and network design best satisfy these requirements?

Proof of Work (PoW) on a public network with anonymous miners.

Delegated Proof of Stake (DPoS) with a fixed set of 21 delegates elected by the public.

Proof of Authority (PoA) with a permissioned network where only approved validators can create blocks.

Proof of Stake (PoS) on a public network with open staking.

A multinational corporation is considering a private blockchain for internal audit trails. They want to ensure that the data is tamper-evident and that auditors can verify the integrity of the ledger without relying on a single entity. Which design choice best achieves this?

Deploy a permissioned blockchain with multiple nodes hosted by different internal departments and external auditors.

Store the ledger in a cloud database with write-once-read-many (WORM) storage.

Use a public blockchain but keep all data encrypted with the company's private key.

Deploy a single-node blockchain that is backed up daily to a secure server.

What primarily ensures the immutability of data on a blockchain?

The use of strong passwords for all users

Encrypting all data with a secret key held by the network

Storing data on read-only media

The cryptographic link between blocks and the consensus of the network

EC-CouncilBlockchain Business Leader Certification

Domain 1Objective 2

Blockchain Architecture and Its Core Components BBLC Practice Questions (Page 7)

Part of the Blockchain Fundamentals for Business domain, which makes up ~11% of our current practice bank.

52questions here

11free pages

10concepts

Questions 31–35

31foundation · easy
In a peer-to-peer (P2P) network, how do nodes communicate?
Select an answer first
32application · medium
A developer is explaining the architecture of a blockchain to a business stakeholder. The stakeholder asks, 'Where does the application logic that runs on the blockchain live?' Which answer is correct?
Select an answer first
33expert · hard
A consortium of 50 healthcare providers wants to share patient records on a permissioned blockchain. They require high throughput, low latency, and the ability to revoke access to a participating node that violates data-sharing policies. Which consensus mechanism and network design best satisfy these requirements?
Select an answer first
34expert · hard
A multinational corporation is considering a private blockchain for internal audit trails. They want to ensure that the data is tamper-evident and that auditors can verify the integrity of the ledger without relying on a single entity. Which design choice best achieves this?
Select an answer first
35foundation · easy
What primarily ensures the immutability of data on a blockchain?
Select an answer first

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