Yep, the parking permit you pick up (I don't think you can BUY it there! you order it online) at 'parking services' in the building across the street from the vet-med complex (you can order it online in ISIS I think, and then pick it up once you get into town).. it allows you to park daily in the back parking lot (behind Trotter). That's pretty much where we all park during the day, unless you're walking or biking to school.
The front lot is reserved for hospital clients, I think faculty, etc. The red lines signify such, and other signs mark the client-only spots. You can park in the front lot after 5 pm, and I think all day on weekends - I can't remem now.
So, yep, get the parking permit if you're going to be driving to class.
* this same parking permit will allow you access to many other campus lots (each lot has colors and letters... our permits are green and give us access to... uhm.. W, Z and I can't remem which other lots). So, say your folks come to town and you want to catch a show at the KSU theater.. you can park in that lot, for example, with your permit. Or, go see the bug zoo, or the gardens, etc. on campus. You'll get a map with the campus lots you're legal for.