Practice Cyber Security MCQs with answers. Threats, encryption, network security, ethical hacking — fully solved for NTS, PPSC, CSS 2026. These MCQs are perfect for NTS, PPSC, FPSC, CSS, OTS, UPSC, GATE, UGC NET, bank exams, university exams, and job interviews. The bold green option ✅ is the correct answer.
⚠️ Threats
1. A cyber attack is:
a) Hardware failure b) Intentional attempt to damage or gain unauthorized access ✅ c) Software update d) Backup process
2. Social engineering targets:
a) Hardware b) Software c) Human psychology ✅ d) Networks only
3. Man-in-the-Middle attack:
a) Installs malware b) Intercepts communication between two parties ✅ c) Deletes files d) Crashes servers
4. Zero-day vulnerability is:
a) An old bug b) Unknown security flaw with no patch available ✅ c) A fixed bug d) A feature request
Encryption
5. Encryption converts:
a) Code to text b) Readable data into unreadable format ✅ c) Images to text d) Audio to video
6. Symmetric encryption uses:
a) Two different keys b) Same key for encryption and decryption ✅ c) No key d) Three keys
7. Asymmetric encryption uses:
a) One key b) Two keys — public and private ✅ c) No keys d) Same key
8. AES stands for:
a) Automatic Encryption System b) Advanced Encryption Standard ✅ c) Applied Electronic Security d) Active Encryption Software
Network Security
9. IDS stands for:
a) Internet Data System b) Intrusion Detection System ✅ c) Internal Defense System d) Intelligent Data Security
10. IPS stands for:
a) Internet Protocol System b) Intrusion Prevention System ✅ c) Internal Process System d) Intelligent Protection
11. A DMZ in networking is:
a) A firewall type b) Buffer zone between private network and internet ✅ c) A VPN type d) A wireless protocol
✅ Best Practices
12. Multi-factor authentication uses:
a) One password b) Two or more verification methods ✅ c) No authentication d) Username only
13. A penetration test is:
a) A virus scan b) Authorized simulated attack to find vulnerabilities ✅ c) A backup d) A software update
14. HTTPS uses port:
a) 80 b) 21 c) 443 ✅ d) 22
15. CIA triad stands for:
a) Central Intelligence Agency b) Confidentiality Integrity Availability ✅ c) Computer Internet Access d) Cyber Investigation Authority
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