21st Century C: C Tips From the New School
Ben Klemens
Building DMZs for Enterprise Networks
Robert J. Shimonski & Will Schmied & V Chang & Thomas W. Shinder
Linux With Operating System Concepts
Richard Fox
Networking for Systems Administrators (IT Mastery) (Volume 5)
Michael W Lucas
Hacking VoIP: Protocols, Attacks, and Countermeasures
Himanshu Dwivedi