In this post we can explore an Architect Track topic.
SharePoint Topology determines the number of servers in a SharePoint farm.
For example: SharePoint Farm consists of the following type of servers:
- Web Front Ends (WFE)
- Application Server
- Database Server
Other subdivisions of servers would be:
- Search Database Server
- Sandbox Code Execution Server
- Crawl & Administration Server
In the matter of Topology determination we can use the following PDF from Microsoft.