Wireless computing seems so convenient: we don't have to be tied to a desk and can compute almost anywhere. There are several reasons, though, why it might be better to use your Ethernet cable instead.
A wired Ethernet connection is faster than wireless. So if you are computing within reach of a data port, use the cable.
Wireless cards use more energy. If you are running on battery, it will drain more quickly while using wireless. If you can plug into power, do; when you can't, turn off the Airport card (Mac) or wireless card (PC) when you are not using it. If you need help finding this function, call the Help Desk (x5418) for assistance.
When using a wired connection it is always best to turn off the wireless adapters, because they have been known to conflict when both are active.
A wired Ethernet connection is more secure. If you are not within reach of a data port, make sure you exercise caution. See the Tech Tip Archives article on Public Wireless Security for more info on safer wireless computing.