Ethernet 10/100Base-T Crossover Cable This cable can be used to cascade hubs, or for connecting two Ethernet stations back-to-back without a hub. It works with both 10Base-T and 100Base-TX
Ethernet 10/100Base-T Straight Thru Cable This cable will work with both 10Base-T and 100Base-TX and is used to connect a network interface card to a hub or network outlet. These cables are sometimes called "whips".
Ethernet 100Base-T4 Crossover Cable This cable can be used to connect two computers together without a hub, or to connect two hubs together (without using an uplink port). If you're connecting two hubs together and one of them has an uplink port, use a straight cable.