Top 50 VPN Interview Questions [UPDATED 2020]
Question 1 What is VPN?
Question 2 What Security Vulnerabilities Are Addressed By VPN?
Question 3 What is Authentication, Confidentiality & Integrity?
Question 4 Can You List Some Items For A VPN Checklist From Deciding Whether To Use, Then Selecting, Then Deploying, then Maintaining VPN?
Question 5 What is Symmetric and Asymmetric Encryption?
Question 6 What is IPSec VPN?
Question 7 Is VPN A Long-term Solution Or A Short-term Stop Gap Kind Of Thing?
Question 8 At what layer IPsec works?
Question 9 What Are Unreasonable Expectations For VPN?
Question 10 Name a major drawback of IPSec?
Question 11 What is the difference between Transport and Tunnel mode?
Question 12 What are the three main security services that IPSec VPN provides?
Question 13 Define Digital Signatures?
Question 14 What Are Reasonable Expectations For A VPN?
Question 15 What is Authorization?
Question 16 Is There Market Penetration For These Products?
Question 17 What Firewall Issues Are Relevant To VPN Selection And Deployment?
Question 18 What is Site to Site and Remote Access VPN?
Question 19 What are the 3 protocols used in IPSec?
Question 20 Explain IPsec Protocol Headers?
Question 21 How ESP & AH provides anti-replay protection?
Question 22 What is IKE?
Question 23 What Kind Of Resources (staff, Computational Muscle, Bandwidth, etc) Are Required for VPN Deployment, Usage, Maintenance?
Question 24 At what protocol does IKE works?
Question 25 Explain how IKE/ISAKMP Works?
Question 26 Explain the messages exchange between the peers in IKE/ISAKMP?
Question 27 What Is The Relationship Between VPN And Firewalls?
Question 28 What is Diffie-Hellman?
Question 29 How Diffie-Hellman works?
Question 30 What are Security Associations?
Question 31 What is Transform set?
Question 32 What are Crypto access lists?
Question 33 Are There Applications or Environments in Which VPNs Would Really Be Detrimental?
Question 34 What are Crypto map?
Question 35 How do you check the status of the tunnel’s phase 1 & 2?
Question 36 What is IPsec Virtual Tunnel Interface?
Question 37 Are VPNs Used For Specific Kinds Of Applications Or Environments? If So, What Are Some Examples Of Where And Why VPNs Would Be Deployed?
Question 38 What is the difference between Static Crypto Maps and Dynamic Crypto Maps?
Question 39 What is Cisco Easy VPN?
Question 40 What is DMVPN?
Question 41 What Crypto Issues Are Relevant In The VPN Context?
Question 42 What are the three phases of DMVPN?
Question 43 Explain Next Hop Resolution Protocol (NHRP)?
Question 44 What is GRE?
Question 45 Name a major drawback of both GRE & L2TP?
Question 46 Who Are The Major Players In The Market?
Question 47 What is SSL VPN? How it is different from IPsec VPN?
Question 48 At which Layer does SSL VPN operates?
Question 49 What are different SSL VPN Modes?
Question 50 What Are Some Of The Tough Questions To Pose To VPN Product Vendors?
Question 51 Explain SSL Handshake?
Question 52 What Kind Of Performance Issues Does VPN Raise?
Question 53 What Security Vulnerabilities Are Unique To Or Heightened By VPN?