Creates a trust relationship between networks and their AD services to allow authentication.

Creates a trust relationship between networks and their AD services to allow authentication.

• A. SDN
• B. Directory Services
• C. Peering
• D. Cross-Domain Connections

Answer: (B)

Authentication across different networks relies on Directory Services, which manage identities and the credentials used to prove them. Directory services store user accounts, enforce access policies, and provide the authentication mechanisms that enable a trust between domains or forests. When such a trust exists, a user in one domain can be authenticated to access resources in another, with the directory service handling the verification of credentials and permissions. The other options don’t provide the mechanism for authentication across domains: SDN focuses on network control, peering relates to linking networks for data routing, and a generic cross-domain connection doesn’t specify the directory-backed trust that enables authentication.