Which term describes the relationship where two forests can authenticate and share resources?

The term that describes the relationship where two forests can authenticate and share resources is "Forest Trust." A Forest Trust is a specific type of trust relationship in Active Directory that allows users in one forest to access resources in another forest. This is particularly useful in multi-forest environments where organizations need to facilitate collaboration while maintaining separate directories.

Forest trusts enable the sharing of identities across different Active Directory forests, allowing for secure authentication and authorization across organizational boundaries. They can be one-way or two-way, depending on the nature of the trust relationship established between the forests.

In contrast, other options pertain to different concepts related to access and security within network environments. Domain Trusts refer specifically to relationships between domains within the same forest or among different forests, but they do not encompass the broader capabilities of Forest Trusts which involve entire forests. Single Sign-On refers to an authentication process that allows a user to access multiple applications with one set of credentials, not necessarily involving forests. Access Control Lists are used to define permissions for users and groups on specific objects, not on the establishment of trust relationships between forests.