The key that is created during Phase 2 of a site-to-site VPN is a symmetrical IPSec key3. This key is used to encrypt and decrypt the data that is exchanged between the VPN peers3. The symmetrical IPSec key is derived from the shared secret and the Diffie-Hellman public keys that are exchanged during Phase 13. References: Site to Site VPN in R80.x - Tutorial for Beginners
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