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Section 1 - Wrap Up

Overview​

  • 1.12 Section 1 - Quiz

[1.12] Section 1 - Quiz​

Question 1:

What undesirable feature of centralised ledgers do distributed ledgers improve upon?
  • The centralised ledger could have too many users
  • There are many possible software options to implement a centralised ledger
  • The centralised ledger is a single point of failure
  • To use a centralised ledger, staff will need training

Question 2:

Which of the following descriptions best describes crash fault tolerance?
  • The distributed ledger can continue to be updated, even if there are multiple users
  • The distributed ledger can continue to be updated, even if one or multiple nodes go offline
  • The distributed ledger can continue to be updated, even if some nodes are sending faulty or malicious messages to others
  • The distributed ledger can continue to be updated, even if nodes are running different client software

Question 3:

How does a node join a permissioned DLT network?
  • It can immediately connect to the network
  • It must solve a computationally difficult puzzle to enter the network
  • The owner of the node must buy the relevant cryptocurrency
  • It must wait for approval by the other nodes of the network

Question 4:

Which of the following are examples of permissionless DLT networks?

(Select all that apply)

  • The Bitcoin Mainnet
  • A Hyperledger Fabric DLT network for a supply chain consortium
  • A Corda DLT network for an inter-bank payment system
  • The Ethereum Ropsten Testnet

Question 5:

Which of the following are essential elements of a DLT network?

(Select all that apply)

  • Providing an identity management system
  • Providing a cryptocurrency
  • Full data replication between DLT nodes
  • Allowing the users to update the ledger via transactions
  • Ordering transactions via a blockchain

Question 6:

Which of the following statements are NOT true regarding distributed ledger technologies?

(Select all that apply)

  • Different DLTs can offer different transaction ordering methods
  • Blockchains can only be used in permissionless DLT networks
  • DLT users are always anonymous
  • Some DLTs allow user defined code to be added to the ledger
  • Consensus protocols must have an anti-sybil mechanism

Question 7:

What of the following correctly describes a light node?
  • A light node contains more data than an archive node
  • A light node contains only a reference to the current state of the ledger
  • A light node only communicates with other light nodes
  • Light nodes can only be implemented in certain programming languages

Question 8:

Which of the following is true regarding DLT gateways?
  • A DLT gateway can only connect to DLT networks of one specific DLT type
  • A DLT gateway can connect only to one DLT node
  • A DLT gateway can only connect to centralised ledgers
  • A DLT gateway can provide additional functionality above what a DLT node provides

Solutions:

  1. C. (See 1.2)
  2. B. (See 1.4)
  3. D. (See 1.8)
  4. A. & D.
  5. A. & D.
  6. B.
  7. B.
  8. D.