We have our backbones using fiber, then to cat5. Cat5 for single machines in the labs, and cat5 on our Gigabit switches going to our servers and to the firewall > t1 router.
A few years ago, there was cat6 and cat5e (something never put in place here). Am I missing out? Am I losing anything by using cat5 for some the high traffic switch ports (like the fileserver and internet)?