A star network is where devices are connected to a central hub or switch. An advantage would be the fact that its very reliable and if one cable or device fails then all the others will continue to work. But a disadvantage would be its costly and if a hub fails the whole network looses connection.
A bus network connects several workstations, servers and printers. The advantages would be its easy and cheap to install. However there's more disadvantages such as if the main cable fails or gets damaged the whole network will fail, as more workstations are connected the performance of the network will become slower causing the connection to slow down ,every workstation on the network can see all of the data on the network so this is a security risk.