What is the difference between Web Layer (Presentation Tier) vs Application Layer (Logic Tier) vs Database Layer (Data Tier)
1. Presentation Layer is the interface to outside world e.g. web site.
2. Application Layer is a framework to create the interface to the Web site or Presentation Tier
3. Database Layer is the database and associated logic needed to query details.
Web Layer (Presentation Tier)
Contains Virtual Machines and Physical Machines with OS can be Windows, UNIX or Linux
Contains Apache web Server, Apache tomcat, Sun Java Web Server or MS Internet Information Services (IIS)
Application Layer (Logic Tier)
Contains Virtual Machines and Physical Machines with OS can be Windows, UNIX or Linux
Contains Apache tomcat, Red Hat JBoss, BEA Web Logic or IBM WebSphere app server
Database Layer (Data Tier)
Contains Virtual Machines and Physical Machines with OS can be Windows, UNIX or Linux
Contains SQL or Oracle