Penetration Tester Interview Questions

347 penetration tester interview questions shared by candidates

1. TCP vs. UDP 2. How DNS recursion works 3. What is SQLi 4. What is SQL 5. What is O(logn) 6. What is ARP 7. What is a VLAN 8. What is a DMZ 9. What is a firewall 10. Difference between heap and stack memory 11. User Space vs. Kernel Space 12. How User Space talks to Kernel Space 13. Three Types of XSS 14. Recursion vs. Iteration (Dev Perspective) 15. How many usable IPs in a /26 subnet
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Penetration Tester

Interviewed at ThreatSpike Labs

4.2
Jan 30, 2026

1. TCP vs. UDP 2. How DNS recursion works 3. What is SQLi 4. What is SQL 5. What is O(logn) 6. What is ARP 7. What is a VLAN 8. What is a DMZ 9. What is a firewall 10. Difference between heap and stack memory 11. User Space vs. Kernel Space 12. How User Space talks to Kernel Space 13. Three Types of XSS 14. Recursion vs. Iteration (Dev Perspective) 15. How many usable IPs in a /26 subnet

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