We use Revolution rather than Advantage. Also please DO NOT use any flea powders and especially no flea collars on your cat. Fleas collars can and have killed cats.
Over the counter medications and powders are often ineffective and can cause more harm than good.
The best use for a flea collar is to cut it up and put it in your vacuum. After each vacuuming, take the bag outdoors. Fleas usually jump on kitty, have their lunch and jump off in the carpets, upholstery, etc. to procreate. You will have to vacuum every day in order to get all them critters as they hatch. Some folks have used flea bombs but you must take the cat out of the house for several hours as well as the humans. I've never used anything like that myself but if you do a search on this site for "fleas" you'll find many, many threads with excellent advice.