Copy of Blockchain Architecture 201 Module 1 Quiz

What is a critical aspect to remember about smart contract security?

Security is proactive, not reactive.

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Security threats and vulnerabilities are static and do not change.

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Staying up to date on the latest vulnerabilities and security best practices is crucial.

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Smart contract code cannot be sandboxed on nodes.

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What is a reentrancy attack in smart contract development?

An attacker repeatedly calls a function before the initial execution completes.

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An attacker accesses private data within the smart contract.

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An attacker modifies the timestamp of a transaction.

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An attacker front-runs transactions with higher gas prices.

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What is the primary defense against front running in blockchain?

Using exact timestamps for transactions.

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Implementing a commit-reveal scheme.

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Increasing the gas price for transactions.

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Allowing only public functions in smart contracts.

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How can developers avoid integer overflow and underflow in Ethereum smart contracts?

Using compiler version 0.7 or lower.

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Employing Safe Math libraries.

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Ignoring arithmetic operations in smart contracts.

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Storing large data sets on-chain.

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What led to the Hedick Attack on the Hedick blockchain?

Reentrancy attack.

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Timestamp manipulation.

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Integer overflow.

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Simple logic error.

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What can result from creating large blocks that exceed the gas limit in a blockchain network?

Improved transaction processing speed.

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Denial of service (DoS) attack.

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Enhanced security against reentrancy attacks.

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More efficient data storage on-chain.

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What is the default visibility setting for functions in many blockchain platforms?

Private.

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Internal.

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Public or external.

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Protected.

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How can timestamp manipulation be avoided in blockchain solutions?

Relying on blockchain for exact timing.

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Avoiding scenarios requiring exact synchronization.

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Using public functions for all smart contract operations.

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Implementing reentrancy guards.

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What is a fifty-one percent attack in a proof-of-work blockchain?

An attack where fifty-one percent of the nodes are offline.

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An attacker controls fifty-one percent or more of the network's processing power.

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An attack that causes a fifty-one percent increase in transaction fees.

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A synchronization issue affecting fifty-one percent of transactions.

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What is a common mitigation for replay attacks in blockchain platforms?

Using exact timestamps for transactions.

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Implementing Safe Math libraries.

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Introducing block nonces.

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Utilizing public functions for transaction verification.

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Copy of Blockchain Architecture 201 Module 1 Quiz

Copy of Blockchain Architecture 201 Module 1 Quiz

June 9, 2024

Blockchain Architecture 201 Module 1 Quiz

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