What Is a VPN? | Explained Simply (VPN Types & Modes for Beginners)

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This session is a practical, interview-focused introduction to VPNs presented by Vikas (industry instructor). It covers why VPNs are used, main VPN types, core IPSec concepts (phases, modes, messages), and basic troubleshooting/security considerations.

⏱️⏱️VIDEO CHAPTERS⏱️⏱️:

00:00:00 - Introduction to VPNs: What is a Virtual Private Network and Why Use It?
00:08:00 - Types of VPNs Explained: Individual, Mobile, On-Demand, and Always-On VPN
00:16:00 - Site-to-Site VPNs: Definition, Use Cases, and IPSec Overview
00:24:00 - IPSec VPN Phases: Phase 1 and Phase 2 Detailed Explanation
00:32:00 - Tunnel Mode vs Transport Mode in VPNs: Key Differences
00:40:00 - IKE and ISAKMP: Internet Key Exchange Mechanisms for VPN Security
00:48:00 - Main Mode vs Aggressive Mode: VPN Message Exchanges and Security
00:56:00 - Understanding VPN Payloads: SA, Proposal, Transform, and Hegel Parameters
01:04:00 - DH Key Exchange and Nounce Numbers in VPN Encryption
01:12:00 - Shared Secret Generation and Authentication in IPSec VPNs
01:20:00 - Perfect Forward Secrecy (PFS) in VPNs: Importance and Implementation
01:28:00 - Aggressive Mode in VPNs: When and Why to Use It
01:36:00 - VPN Crypto Profiles: Configuration, Best Practices, and Course Conclusion

#VPN #VirtualPrivateNetwork #MPLS #RemoteWork#IKE #ISAKMP #Phase1 #Phase2 #IPSecSA#CryptoProfiles #DH #Nonces #TransformPayload#Troubleshooting #NATTraversal #InterviewPrep #NetworkAdmin #Networking#Nwkings#Networkkings

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