Terminology (Cont.)

• Dynamic Routing

• • Routers and hosts use an IGP or EGP to update their routing tables periodically
  • • Typically used in network backbone and WANs, and groups of LANs

• Static Routing

• • Routers and hosts are administratively configured with some number of routes that will not change
  • • Typically used on hosts and on “edge routers”

• Policy-Based Routing

• • Routing decisions are not just made upon topological, connectivity or traffic considerations
  • Local administrative policy may determine or influence routing.
  • • E.g., “send all packets from customer X on network Y”

• Most networks use some combination of all three