Secure Tunneling Protocols

C.

Among the given options, the protocol that is used with a tunneling protocol to provide security is IPSec.

IPSec, or Internet Protocol Security, is a suite of protocols that is used for securing Internet Protocol (IP) communications. It provides security services such as authentication, encryption, and integrity checking, which are crucial for ensuring the confidentiality, integrity, and authenticity of network communications.

Tunneling, on the other hand, is a technique that is used to encapsulate one protocol within another, such as encapsulating IP traffic within another protocol such as Secure Sockets Layer (SSL) or Transport Layer Security (TLS) for secure communication. Tunneling helps to hide the original IP packets from unauthorized access and can be used to establish secure connections between two networks or hosts.

When a tunneling protocol is used, such as Point-to-Point Tunneling Protocol (PPTP) or Layer 2 Tunneling Protocol (L2TP), IPSec can be used to provide an additional layer of security by encrypting the encapsulated traffic. This means that not only is the original traffic hidden, but it is also encrypted, making it much more difficult for unauthorized parties to intercept and access the data being transmitted.

In summary, IPSec is used with tunneling protocols to provide an additional layer of security by encrypting encapsulated traffic, thus ensuring the confidentiality, integrity, and authenticity of network communications.