First you need to turn 256kbytes in to bit so * 8 = 2048 kbit then you need to turn it in to gbits so divide by 1024 to get mbits 2 then divide by 1024 to gbits = 0.002gbits
then divide 0.002 gbits by the 1 gigbit = 0.002 secounds
As you've not listed any of the 10Gbit protocols, we can't help. Try looking up Wikipedia for your answer.
Yes, you can buy gigbit switches for your network job on the following website: http://www.netgear.com/default.aspx?aspxerrorpath=/products/business/switches/smart-switches/gs724t.aspx. They have a great product.
no such thing as tetrabit. its terabit. >_> 1000 gigbit = 1 terabit.
Gigabit Ethernet : 1Gbps // ATM : 25, 45, 155, or 622 Mbps // Cable Modem : 512 Kbps to 5 Mbps // SDSL : Up to 2.3 Mbps // ISDN : 64 Kbps to 128 KbpsTelephone Lines : 56 KbpsThe question states SLOWEST TO FASTEST so it would be in reverse order:Telephone lines: 56kbps, ISDN: 64 Kbps to 128 KBps, SDSL: Up to 2.3 MBPS, Cable Modem: 512 Kbps to 5 Mbps, ATM: 25, 45, 155, or 622 MBps and Gigbit Ethernet: 1Gbps