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AES 

Advanced Encryption Standard

Symmetric encryption algorithm that is widely used in IPsec for data encryption.

It comes in different key sizes (e.g., AES-128, AES-256).

CBC

CBC does not have this "authentication" capability 


GCMGalois/Counter Mode

AES-GCM is an authenticated encryption algorithm designed to provide both authentication and privacy.



https://www.juniper.net/documentation/en_US/junos/topics/concept/ipsec-encryption-solutions.html

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CBC

Cipher Block Chaining



IV ( initialization vector ) is to avoid to start at 1 to n, instead random to another random number


GCMGalois/Counter Mode
to encrypt the data

GCM but only authGMAC or Galois Message Authentication Code 
just for authenticate the date



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