Generally, a genealogical DNA test might use either autosomal STRs or autosomal SNPs. (STR's are Short Tandem Repeats; SNPs are single-nucleotide polymorphisms.) However, testing companies do not currently offer autosomal STRs tests that use enough STR markers for genealogy.
The schema is the Active Directory component that defines all the objects and attributes that the directory service uses to store data. The physical structure of the schema consists of the object definitions. The schema itself is stored in the directory.
This chapter will teach you. 1  What Active Directory is. 2  How standard protocols like DNS dynamic update protocol and Lightweight Directory Access Protocol (LDAP) are used. 3  How to plan for migrating to Active Directory.  What objects, schema, object classes, and attributes 1  are. How replication and partitioning work.