Guys, I've been considering doing the CCNA: Security, and I was wondering what kind of kit I should get. I was thinking that a kit with a firewall would be necessary, but, apparently, not. I'm also curious as to why most of the kits include two routers as opposed to one. Basically, I'd like some help on choosing the right kit. Any help would be much appreciated. Right now, I'm thinking about going with two routers and a switch.