# Exercises
The following questions are created to help you review the material
this chapter covered.

**How do Light nodes verify payments? How are Merkle Paths involved and 
what are they?**
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**How does the blockchain network guarantee that valid information
spreads quickly but not invalid information?**
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**Describe how a completely new node gets up to speed.**
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**Explain how a new block is generated on a Proof-of-Work blockchain.**
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**Why is it necessary for blocks to always be produced, even if they
are empty, for the blockchain to remain valid?**
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**Describe what a accidental fork is and how it is rectified?**
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**What is the difference between a centralized and peer-to-peer mining pool?
How does the latter produce valid blocks for the main chain?**
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**What is the difference between public and private blockchains?**
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**Briefly explain how blockchain is a solution to the Byzantines General Problem.**
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**Why is it beneficial nodes to have multiple connections in public blockchains?**
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