Blockchain and its Applications Assignment 11 Answers
1) Hyperledger Aries is used for transmitting verifiable digital credentials.
a. False
b. True
Answer: b
2) Which of the following is true about Hyperledger Aries?
a. Aries cloud agent exposes API to access Aries capabilities
b. Aries controller implements application business logic
c. The controller sends requests
d. Response events are fed back to the controller as webhooks
Answer: a, b, c, d
3) Which of the following is not a risk for blockchain operations?
a. 51% vulnerability
b. Private key security
c. Double spending
d. None of the above
Answer: d
4) Selfish mining attacks cause forking problems in the network.
a. True
b. False
Answer: a
5) Which of the following is/are true for Eclipse Attack.
a. The Attacker partitions miners
b. The attacker re-populates the victim mode’s peer tables
c. The victim node restarts and loses current outgoing connections
d. The victim establishes all new outgoing connections to attacker IP addresses
Answer: a, b, c, d
6) Attacker can perform a front-running attack if he/she knows about upcoming transactions?
a. False
b. True
Answer: b
7) Blockchain Trust is mainly controlled by which of the following?
a. Consensus
b. Immutability
c. Provenance
d. Finality
Answer: a, b, c, d
8) For defining enterprise-level blockchain, which of the below factors need to be analyzed?
a. Network
b. People
c. Assets
d. Transactions
Answer: a, b, c, d
9) In which of the following cases a node stops responding?
a. Power failure
b. Network failure
c. Security updates
d. DoS attacks
Answer: a, b, c, d
10) What is a major problem with Proof of Work in a large-scale network?
a. It is difficult to implement
b. It is Resource-intensive and consumes enormous amounts of power
c. Multiple miners have to be rewarded
d. It is unreliable
Answer: b
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