Yes; Ethernet is really not a single technology, but a family of technologies. Details vary, for example between fiber optic and copper cable; but it is still considered "Ethernet".
10 Base 2 uses RG58. Since this is in the Catagory for Xbox. you can not connect this directly to your Xbox, you must use 10BaseT or a converter to get from 10Base2 to ethernet with an RJ45 Connector.
Gigabit = 1,000,000,000 bps (bits per second) = 125,000,000 Bps (Bytes per second) = 125 MBps (Megabytes per second (10^3)) = 119.209... MiBps (Mebibytes per second (2^10))10 Gigabit = 10,000,000,000...
a switch is more expensive and a network built with switches is generally considered faster than one built with hubs. Yes. And a hub just blatts all inputs to all outputs - effective, but data...