Linux network administration is a good learn linux book. We used it my freshman year of college and i still use it a reference.
Cisco Penetration Testing is another good one on ways to approach Pen testing and exploits.
Im waiting for the metasploit book which should be great!
hope those first 2 books help.
[editz] I havent gotten around to it yet, but i hear the 2 books by kevin mtnick are good. Art of intrustion and art of deception. [/editz]



