Blockchain and Crypto Cheat Sheet 2026

The 30 highest-yield Blockchain and Crypto facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What does a VPN provide in terms of network security? → Encrypted communication tunnels over public networks
2. What is a liquidity pool in DeFi? → A reserve of tokens locked in a smart contract
3. What is the primary data structure that gives blockchain its name and immutability? → A hash-linked chain of blocks referencing the previous block's hash
4. What is the most important competency assessed in Cryptography & Data Protection for professionals in this field? → Applied knowledge and practical problem-solving ability
5. What does the phrase 'not your keys, not your coins' mean? → Without direct control of your private keys, you do not truly own your cryptocurrency
6. What is 'impermanent loss' in DeFi? → Temporary value loss experienced by liquidity providers when asset prices diverge
7. What is a DMZ (Demilitarized Zone) in network architecture? → A network segment between internal and external networks that hosts public-facing services
8. What is dollar-cost averaging (DCA) in cryptocurrency investing? → Investing a fixed dollar amount at regular intervals regardless of price
9. Which best describes the scope of Access Control & Identity Management in professional practice? → A comprehensive area covering both theoretical foundations and practical applications
10. What is network segmentation and why is it important? → Dividing a network into smaller segments to contain breaches and control access
11. What is the recommended approach to staying current in Access Control & Identity Management? → Regular professional development, industry publications, and peer collaboration
12. What is the recommended approach to staying current in Vulnerability Assessment & Penetration Testing? → Regular professional development, industry publications, and peer collaboration
13. What is the first step in the risk management process? → Risk identification — recognizing potential threats and vulnerabilities
14. What does Total Value Locked (TVL) measure in DeFi? → The total value of cryptocurrency assets deposited in DeFi protocols
15. What common challenge do professionals face when applying Cloud Computing & Virtualization principles? → Balancing theoretical best practices with practical constraints and real-world conditions
16. Which best describes the scope of Threat Detection & Incident Response in professional practice? → A comprehensive area covering both theoretical foundations and practical applications
17. What is an Automated Market Maker (AMM)? → A smart contract that prices assets using a mathematical formula
18. What common challenge do professionals face when applying System Administration & Configuration principles? → Balancing theoretical best practices with practical constraints and real-world conditions
19. What is yield farming in DeFi? → Earning rewards by providing liquidity to protocols
20. What is wash trading in cryptocurrency markets? → Simultaneously buying and selling the same asset to artificially inflate trading volume
21. What is the most important competency assessed in Operating Systems & Platforms for professionals in this field? → Applied knowledge and practical problem-solving ability
22. What is a Central Bank Digital Currency (CBDC)? → A digital form of a nation's fiat currency issued and regulated by its central bank
23. What common challenge do professionals face when applying Application Security & Development principles? → Balancing theoretical best practices with practical constraints and real-world conditions
24. What is the consequence of non-compliance with mandatory regulations? → Penalties including fines, license revocation, and potential legal action
25. What is the Ethereum Virtual Machine (EVM)? → The runtime environment that executes smart contract bytecode on Ethereum nodes
26. What is slippage in cryptocurrency trading? → The difference between the expected trade price and the actual execution price
27. What is the genesis block in a blockchain? → The first block in the blockchain with no predecessor
28. What is the most important competency assessed in Access Control & Identity Management for professionals in this field? → Applied knowledge and practical problem-solving ability
29. What is the principle of least privilege in network security? → Users should have only the minimum access needed to perform their job functions
30. What is a stablecoin? → A cryptocurrency pegged to a stable reference asset such as the US dollar