Final answer:
IKE is the most likely protocol used with IPsec to establish secure communication channels and negotiate cryptographic keys.
Step-by-step explanation:
The most likely protocol to be used with IPsec is the Internet Key Exchange protocol (IKE). IKE is used to establish secure and authenticated communication channels between devices to negotiate the cryptographic keys used for IPsec encryption. It provides a framework for authentication, key management, and secure communication.
IKE uses a combination of cryptographic algorithms for key exchange and authentication, such as the Diffie-Hellman protocol for secure key exchange and digital certificates for verifying the identity of the communicating parties.
Once the secure channel is established, IPsec uses cryptographic algorithms such as AES or 3DES to encrypt the data in transit. These algorithms ensure the confidentiality, integrity, and authenticity of the transmitted data.