Computer Network: Using Star Topology

 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.

When hub receive data from Work Station A and switches the data to workstation B with logic address  change become number IP of last destination number.

If hub that was used is an active hub so the process that happen on hub is not just switching but the signal will be repeat or generate again. The activity of hub is controlled by software that is installed on the computer server.

To expand the field of network so the network can connect to internet use modem which have connection to phone line with proxy system. Modem is used to change data digital from computer to data analog to connection to internet, because phone line used analog data. Modem is connection to computer server use serial cable, which is the server is used as gateway by workstation.

Each the workstation must enter the number IP server to identification column on gateway to do data communication. With other computer on outdoor of internet network so data was sent to hub and the hub read the destination or physical address on the bit stream address. If the destination address were not found on table physical address number that was had by hub so the hub send data to gateway / server and then server will retransmit to other network/ internet. If the destination number on internet or other network not found then the data will remove from network depend of time to life.