CCNA Discovery 2, Chapter 6
6.1.1: Routers decide where to forward a packet by using information stored in routing tables. A router maintains a list of its interfaces and which networks are connected to those interfaces in its routing table. You can manually add a static route to a routing table, or routers can dynamically learn about routes from other routers, using a routing protocol. The following key points define the process a router uses to forward a packet:
1. A packet arrives at the router containing a destination IP address and subnet mask. The router uses the subnet mask to determine the packet’s network bits and destination network.
2. The router references its routing table to find an entry with a matching destination network. In ...
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