Follow these directions to routing table on a Cisco router or switch in IOS.

1. In IOS, type enable and press enter
2. Type show ip route and press enter. The routing table is displayed.

Here is a simplified example routing table.

Gateway of last resort is 0.0.0.0 to network 0.0.0.0
D 0.0.0.0/0 [1/2] via 192.168.0.1, 1424:17:58,
C 127.0.0.0/8 is directly connected, GigabitEthernet0/0  192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.0.0/24 is directly connected, GigabitEthernet0/0L 192.168.0.1/24 is directly connected, GigabitEthernet0/0

Notice GigabitEthernet0/0.  GigabithEthernet0/0 connects to the switch and the LAN.

• Routes that begin with the letter C are connected routes.
• Routes that being with the letter D are EIGRP (enhanced interior gateway routing protocol).

When the router receives a packet with destination IP address 192.168.x.x, the packet is sent out the GigabithEthernet0/0 interface (to the switch).  When the router receives a packet where the destination IP address is not 192.168.x.x, the Gateway of last resort is used, which is Serial 0/0/0 which connects to the ISP.