Quiz 13 - DeFi Security II

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DeFi MOOC

Question 1 - Which of the following is not correct? *

1 point

A DeFi attacker can target any of the system layers (3rd party, DeFi protocol, smart contract, blockchain, network, hardware, etc.)

An attacker can create several high-frequency spy nodes that connects to as many peers as possible, to detect all network layer traffic

Attacker can only front-run, but its hard to back-run victim transactions

Eclipse attack can lead to double spending.

Question 2 - Why MEV (DeFi application layer) is a concern for blockchain consensus layer security? *

1 point

Because miners can censor other MEV searchers, and instead extract MEV themselves, which is unfair.

Because miners can deliberately fork the blockchain, in an attempt to steal MEV extracted by other miners

MEV makes the miners rich, which renders the entire ecosystem more centralised

Question 3 - Assume that all miners in the Ethereum network order blocks by gas price, and do not collaborate with relayer service. Which of the following is the is not correct? *

1 point

An attacker needs to pay a gas price of p+1 to front-run a victim transaction with gas price of p.

An attacker needs to pay a gas price of p-1 to back-run a victim transaction with gas price of p.

To be positioned first in the block, an attacker must pay a higher gas price than every other transaction in the same block.

A sandwich attack requires the attacker to both front- and back-run the victim.

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