A government agency wants to create a transparent system for tracking the distribution of disaster-relief funds. They need to ensure that funds are traceable from the central treasury to individual recipients, and that any attempt to divert funds is detectable. They also need to protect the personal data of recipients. Which design best meets these requirements?

A public blockchain where all transaction details, including recipient names, are visible to everyone

A permissioned blockchain where transaction metadata is public but recipient identities are stored off-chain with hashed references

A centralized database with a public dashboard showing aggregated spending

A private blockchain operated by the treasury department with no public access

A blockchain network uses a proof-of-stake consensus where validators are selected based on the number of tokens they stake. An attacker controls 35% of the total staked tokens. Which attack is the attacker most likely able to perform?

Creating new tokens out of thin air

Rewriting the entire blockchain history from the genesis block

Stealing funds from other users' wallets

Censorship of transactions by refusing to include them in blocks they propose

In a blockchain, what is the role of the 'chain' in the term 'blockchain'?

It is the list of transactions that are waiting to be confirmed.

It is the sequence of blocks linked by cryptographic hashes.

It refers to the physical network cables connecting the nodes.

It is the set of rules that govern how transactions are validated.

EC-CouncilBlockchain Developer Certification

Domain 1Objective 1

Blockchain Technology Concepts and Distributed Ledger Technology (DLT) BDC Practice Questions (Page 8)

Part of the Blockchain Fundamentals and Architecture domain, which makes up ~14% of our current practice bank.

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Questions 36–40

36expert · hard
A government agency wants to create a transparent system for tracking the distribution of disaster-relief funds. They need to ensure that funds are traceable from the central treasury to individual recipients, and that any attempt to divert funds is detectable. They also need to protect the personal data of recipients. Which design best meets these requirements?
Select an answer first
37expert · hard
A blockchain network uses a proof-of-stake consensus where validators are selected based on the number of tokens they stake. An attacker controls 35% of the total staked tokens. Which attack is the attacker most likely able to perform?
Select an answer first
38foundation · easy
In a blockchain, what is the role of the 'chain' in the term 'blockchain'?
Select an answer first
39foundation · easy
Which component of a blockchain contains the actual data being recorded, such as asset transfers or contract terms?
Select an answer first
40foundation · easy
Which of the following is a common consensus mechanism used in blockchain networks?
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Blockchain Technology Concepts and Distributed Ledger Technology (DLT) BDC Practice Questions (Page 8)

Questions 36–40

A blockchain network uses a proof-of-stake consensus where validators are selected based on the number of tokens they stake. An attacker controls 35% of the total staked tokens. Which attack is the attacker most likely able to perform?

In a blockchain, what is the role of the 'chain' in the term 'blockchain'?

Which component of a blockchain contains the actual data being recorded, such as asset transfers or contract terms?

Which of the following is a common consensus mechanism used in blockchain networks?

Keep studying — Blockchain Fundamentals and Architecture