If your network guy says you need a cable, it probably means that wireless isn't available for you. Just to make sure, you could ask someone who you see using a laptop wirelessly how they do it. If you don't see anyone using a laptop wirelessly, that would be additional confirmation that it isn't available.

I don't think you should be talking about "crack"ing you employer's wireless. Your employer might object. Cracking means getting access without permission of the person who set up wireless.