Each router's routing table shows the best route to the destination address;
When a circuit or router fails, an alternate equal-cost path to the destination exists in every routing table.
The NAT router checks the routing table to see if it has an entry for the destination address.
Each router's routing table shows the best route to the destination address; for addresses that may be several hops away, it shows the best next-hop router.
This route, placed at the top of the routing table, matches all requests ending with suffix and sets them up to use the json output type. That's not all it does though.
Optional dynamic update to routing tables and other configuration.
More to the point, it allows every device to have its own IP address, and the routing tables to be sufficiently sparse that routing is cheap.
