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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).

CBCCipher Block Chaining

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

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






CBC

Cipher Block Chaining


if Plain text block is 128 bits  >> 

IV ( initialization vector )

will be 128bitsI guess the key will be also 128bits

is to avoid to start at 1 to n, instead random to another random number

Image Added


GCMGalois/Counter Mode
to encrypt the data
GCM but only authGMAC or Galois Message Authentication Code 
just for authenticate the date