Introduction to Cisco IPSec VPN Technologies
If you are new to the basic concepts of VPN (Virtual Private Network) and IPSec, please learn following lessons before continuing.
• What is VPN (Virtual Private Network)
• What is IPSec and Why we need IPSec
• Important Technical Terms Related with IPSec
• What are the terms Encryption, Decryption, Clear-Text and Cipher-Text
• What are the terms Symmetric Encryption and Assymetric Encryption
• Important Symmetric and Assymmetric Encryption Algorithms
• What are Hash values? Important Hash value Algorithms
• How Hash Values can be used to determine Integrity of Data
• What is HMAC (Hashed Message Authentication Code)
• What is Diffie-Hellman Key Exchange
• What is Diffie-Hellman Group
• Main Components of IPSec - IKE, ESP and AH
• IPSec VPN Modes - Tunnel Mode and Transport Mode
• Security Association and Security Parameter Index
• IKEv1 Main Mode, Aggressive Mode and Quick mode Message Exchanges
• What is Perfect Forward Secrecy (PFS)
• IKEv2 Phase 1 (IKE SA) and Phase 2 (Child SA) Message Exchanges
• What is NAT-Traversal (Network Address Translation - Traversal)