A replication topology defines whether databases replicate data directly with each other, or through intermediate hub databases. Two typical replication topologies are Point-to-Point and Hub and Spoke.
Point-to-Point topology
With the Point-to-Point topology, each database
generates a transfer package for one of two uses. The uses include
a database to which information is to be sent or a database to which
control of a CR is to be handed over.
Hub and Spoke topology
In the Hub and Spoke topology, spoke databases do not replicate directly between each other. Instead, they replicate via one or more hub databases.