Core 2: Security
40 free practice questions with explanations
PassNova has 40 free CompTIA A+ practice questions on Core 2: Security, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Core 2: Security: example questions & answers
Here are 6 example questions from this topic. Practise the full set of 40 free in the browser.
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Which malware disguises itself as legitimate software to trick users into installing it?
- A Worm
- B Trojan ✓
- C Rootkit
- D Ransomware
Answer: A Trojan masquerades as legitimate software to gain access once the user runs it.
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Which malware encrypts a victim's files and demands payment for the decryption key?
- A Spyware
- B Ransomware ✓
- C Adware
- D Rootkit
Answer: Ransomware encrypts files and demands payment, often in cryptocurrency, for the decryption key.
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Which malware self-replicates across networks without user interaction?
- A Trojan
- B Worm ✓
- C Keylogger
- D Adware
Answer: A worm self-replicates and spreads across networks without needing user action.
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Which malware hides deep in the OS to maintain privileged, stealthy access?
- A Adware
- B Rootkit ✓
- C Spam
- D Phishing
Answer: A rootkit conceals itself at a low level (often kernel) to maintain privileged, hidden access.
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Which attack tricks users via fraudulent emails to reveal credentials or click malicious links?
- A DDoS
- B Phishing ✓
- C SQL injection
- D Brute force
Answer: Phishing uses deceptive emails or messages to trick users into revealing data or clicking malicious links.
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A targeted phishing attack aimed at a specific high-value individual is called what?
- A Vishing
- B Spear phishing / whaling ✓
- C Smishing
- D Pharming
Answer: Spear phishing targets specific individuals; whaling targets senior executives specifically.