There is a used book store nearby that is selling quite a number of Cisco training books - routing, IP, etc. I looked on the back cover, and they would regularly retail for anywhere from $80 to $100 CDN, but of course they are used so they go for less - like about $2.95 each... I am not really up on how networking stuff changes and at what rate it changes, but these books are only about 4-5 years old. Are they way out of date, or what? Either way, the price is pretty darn good, and I might buy a few, but I was curious as to whether or not they will basically be the same as the ones that are new in the store right now.
The details will be out of date, but the concepts and terminology will remain the same because they don't change much.