Which of the following technologies allows for the secure exchange of encryption keys within an internal network?

AES (Advanced Encryption Standard) is a symmetric block cipher used to encrypt data in transit or at rest, not a mechanism for exchanging or establishing encryption keys between parties.

RC4 is a stream cipher used for encrypting data and does not provide any key exchange or key agreement functionality.

Diffie-Hellman enables two parties to derive an identical shared secret key over an insecure channel using the mathematical properties of modular exponentiation, without ever sending the key across the network. Even if the exchange is intercepted, the shared secret cannot be computed by an attacker without solving the discrete logarithm problem. It is widely used in protocols such as TLS and IPsec to establish session keys before symmetric encryption begins.

3DES (Triple Data Encryption Standard) is a symmetric block cipher that applies DES encryption three times to each data block and does not provide a mechanism for securely exchanging keys.