Ok. If GThill says that you're right, then I'm wrong which I admit. For some reason, I thought that RTS/CTS is optional. When I read chapter 8, there was no mention of RTS/CTS until I read it in chapter 9 where it is used in a b/g mixed environment. So logically, I thought since 802.11b clients require RTS/CTS (or so I thought) and in a mixed environment, you have to use CTS to self, if you turned that off, 802.11b clients won't be able to communicate because the AP won't give them a chance. Now that I read page 296, it's a little more clear for me on understanding g-only mode.