170.170.10.1

170.170.11.1

When your network has multiple tiers of Routers the routing works the same way. However once we have a router to router connection an IGP (Interior Gateway Protocol) will be used to determine the best route

Router to Router

Layer 3

170.170.10.0

170.170.12.0

170.170.12.1

170.170.13.1

170.170.11.0

170.170.13.0

170.170.0.0/30

255.255.255.252

170.170.0.4/30

255.255.255.252

170.170.0.1

170.170.0.2

170.170.0.5

170.170.0.6

There are 2 types of IGP's

Link State

Distance Vector

IGP Used

IGP Used