Reading Time: 3 minutesHorizon allows you to configure one or more replica Connection Server instances in a single Connection Server group to provide both more performance and more resiliency. This configuration use the Microsoft Active Directory Lightweight Directory Services (AD LDS), formerly known as Active Directory Application Mode (ADAM). AD LDS has some similar aspects of the traditional Active Directory, for example the LDAP schema, the replication across servers, and the master node concept.