In a star topology, each device has dedicated point to point link only to a central controller or concentrator that usually called a hub. Computer workstation are not directly linked to each other. If one workstation (A) want to send data to other workstation (B), first workstation A sends data to a hub and then the hub retransmit data that was received to the destination address is workstation B.
To send data from workstation A is reference on OSI architecture with is complete with header contain address and trailer as error correction. Logic address in header this value is dynamic. When Work Station A send data to Work Station B, the first logic address value at bit stream data is number IP Hub, but the physical address always is the last destination address is workstation B.
