Chapter 2 Advanced Routing for FortiOS 5.0 : Advanced Static Routing : Routing concepts
  
Routing concepts
Many routing concepts apply to static routing. However without first understanding these basic concepts, it is difficult to understand the more complex dynamic routing.
This section includes:
Routing in VDOMs
Default route
Adding a static route
Routing table
Building the routing table
Static routing security
Multipath routing and determining the best route