Types of Blockchain Networks Flashcards
6 cards from real Blockchain Technology practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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Which of the following is a defining characteristic of a public, permissionless blockchain?
Answer: Anyone can join the network, read the ledger, and participate in the consensus process.
Public, permissionless blockchains like Bitcoin and Ethereum are designed to be open and accessible to everyone. Anyone can download the software, connect to the network, view the entire transaction history, and participate in validating transactions (consensus) without needing approval from a central administrator.
A global shipping consortium formed by ten major logistics companies wants to create a shared, immutable ledger. They need to restrict network participation and validation to only member companies to protect sensitive commercial data. Which type of blockchain network is most appropriate?
Answer: Consortium Blockchain
A consortium blockchain is governed by a group of organizations rather than a single entity (private) or being open to the public. This model is ideal for collaboration between multiple companies in the same industry, allowing them to share a ledger with controlled access, ensuring data privacy and joint governance among trusted parties.
What is a primary advantage of a private blockchain when compared to a public blockchain?
Answer: Greater transaction speed and scalability.
Private blockchains have a limited number of known, permissioned nodes. This allows for more efficient consensus mechanisms and significantly higher transaction throughput (speed) and scalability compared to public blockchains, which must secure a vast, anonymous network.
A hospital wants to use a blockchain to store patient medical records. They need to keep sensitive patient data confidential and on a permissioned ledger, but also provide a way for patients to publicly verify the integrity and timestamp of their records without revealing the content. Which network model best addresses this need for both privacy and public verifiability?
Answer: Hybrid Blockchain
A hybrid blockchain combines features of both private and public networks. In this scenario, the confidential medical records can be stored on a private, permissioned chain accessible only to the hospital and patient, while a hash or proof of the record can be anchored to a public blockchain for immutable, publicly verifiable timestamping and integrity checks.
In the context of blockchain network types, what is the key difference between a private blockchain and a consortium blockchain?
Answer: A private blockchain is controlled by a single organization, while a consortium is governed by multiple organizations.
The primary distinguishing factor is governance. A private blockchain is managed and controlled by a single entity. A consortium blockchain distributes control among a group of pre-selected, collaborating organizations.
Which of the following statements best describes a 'permissioned' blockchain network?
Answer: Only a select group of pre-authorized and identified participants can join the network and validate transactions.
Permissioned blockchains, which include both private and consortium types, restrict access. Participants must be granted permission to join the network, and their identities are typically known. This controlled environment allows for greater privacy, scalability, and specific governance rules tailored to the participants' needs.