How Data sent from Source Host to Destination Host
R1 receives Ethernet frame from user computer
R1 strips off Ethernet Frame
R1 examines destination IP
R1 Checks the routing table for destination IP
R1 then looks up next hop IP address
R1 re-encapsulates IP packet with a new Ethernet frame
R1 forwards ethernet packet out to outside interface
A router forwards each packet from one network to another. A source host creates a packet, places the destination address in the packet header, and then sends packet to nearest router.
When a router receive a packet, the router uses the destination address to select the next router on the path to the destination, and then transmit the packet. Eventually, the packet reaches a router that can deliver the packet to its final destination.
