useful onlione free books for IT Professionals and IT Students.

http://www.ebooksquad.com/category/hardware/lan-and-wlan

http://www.intelligentedu.com/blogs/post/category/free_computer_books


http://www.pdftutorials.com/tutorials/NETWORKING/networking-books-shelf3.html

http://www.intelligentedu.com/newly_researched_free_training/Networking.html