802.11ac: A Survival Guide (all about modern routers}

http://chimera.labs.oreilly.com/books/1234000001739

If you interesting on learning and understanding all about routers, this e-book is free! I read the whole book, on-line. I do testify and will tell you, it did provide me excellent knowledge and understanding about legacy routers and the new AC technology for routers.

Enjoy

Knowledge is power.