Routers see networks, not hosts. Routers are a little like a taxi driver in New York. If you tell the driver to take you to room 201 of the Empire State Building, he or she will ignore the room number and take you to the building. Similarly, a router looks at a destination network, not the specified host portion of a destination address. Chapter 6 of CCNA Discovery 2 covers the concepts behind how a router learns about destination networks to forward a packet to its intended destination.