The ExamPrep for Net+ is a good book. But if you already have your CCNA, you should already know which layers of the OSI model bridges, brouters, routers, switches and hubs work at. Plus you already know all about advanced IP addressing and subnet masking, Net+ should be a piece of cake. Net+ only covers the basics of subnet masking and IP addressing.
"Oh my beloved Ice Cream Bar, how I love to lick your creamy center" - Ren