Our office Netgear router has 24 ports. I am about to fill the last 3 empty ports. Is it dangerous to use all ports? How can I add more? Can I buy another router or hub and plug in to an empty port on the netgear router? What if I added a wireless router? For security I assume that since it would be behind our firebox that a person would have to have our network domain login in order to jump on the wireless network? Is this a pretty simple thing I am asking or should I consult a professional?