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- A ROUTE is needed to send data to a remote host.
- It may require making many hops along the way.
- Routers (and gateways) perform these duties.
- To find routes each router must know about the topology of the subnet that connect it to the other routers and choose appropriate paths through it.
- This is achieved hierarchically with some complex algorithms generating routing tables for each router.
- Internet routing operates with packet (OSI Network layer).
- Each packet contains a destination address used by the router to decide which output line it should be sent on.
- Static routing don't care about network variables (load, changes in topology, temporary failures); routing tables are fixed.
- Dynamic routing changes routing tables to reflect the status of the net and achieve optimal performances. It's more complex to setup.
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