Network Security
55 free practice questions with explanations
PassNova has 55 free CompTIA Network+ practice questions on Network 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.
Network Security: example questions & answers
Here are 6 example questions from this topic. Practise the full set of 55 free in the browser.
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Which element of the CIA triad ensures data is not altered by unauthorized parties?
- A Confidentiality
- B Integrity ✓
- C Availability
- D Authentication
Answer: Integrity ensures data is not modified by unauthorized parties.
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Which CIA element ensures only authorized users can access data?
- A Confidentiality ✓
- B Integrity
- C Availability
- D Accounting
Answer: Confidentiality ensures data is accessible only to authorized users.
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Which CIA element ensures systems and data are accessible when needed?
- A Confidentiality
- B Integrity
- C Availability ✓
- D Authorization
Answer: Availability ensures resources are accessible to authorized users when needed.
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Which security model assumes no implicit trust and verifies every request?
- A Perimeter security
- B Zero trust ✓
- C Open access
- D Implicit trust
Answer: Zero trust assumes no implicit trust and continuously verifies every access request.
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Which attack floods a target with traffic from many compromised sources?
- A Phishing
- B DDoS ✓
- C SQL injection
- D Spoofing
Answer: A DDoS attack overwhelms a target using traffic from many compromised hosts.
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Which attack sends forged ARP replies to intercept traffic?
- A DNS poisoning
- B ARP spoofing/poisoning ✓
- C SYN flood
- D Smurf
Answer: ARP spoofing sends forged ARP replies to associate the attacker's MAC with a target IP.