network administrator free ebook guide
Securing Mac OS X.pdf
This guide is aimed at users in environments requiring stronger security controls in an operating system, making full use of the protection features offered in OS X.
Introduction to Linux: a Beginner’s Guide.pdf
Short Table of Contents of free Linux ebook, Introduction to Linux: a Beginner’s Guide.pdf:
Chapter 1 What is Linux
Chapter 2 Quickstart
Chapter 3 About Files and the Filesystem
Chapter 4 Processes
Chapter 5 I/O Redirection
Chapter 6 Text Editors
Chapter 7 Home Sweet /home
Chapter 8 Printers and Printing
Chapter 9 Fundamental Backup Techniques
Chapter 10 Networking
Chapter 11 Sound and Video
Appendix A Where to go from here
Appendix B DOS versus Linux Command
Appendix C Shell Features
Breaking into Computer Networks from the Internet.pdf
Toolmakers will frown upon this document and yet it may provide you with some useful insight (even if it better the tools you manufacture). It attempts to provide a methodology for HACKing. It attempt to answers to “how to” question, not the “why” or the “who”. It completely sidesteps the moral issue of HACKing; it also does not address the issue of HACKers/crackers/black hats/gray hats/white hats.
Linux Network Administrator’s Guide 2nd Edition
This book was written to provide a single reference for network administration in a Linux environment. Beginners and experienced users alike should find the information they need to cover nearly all important administration activities required to manage a Linux network configuration.
Linux Network Administrator’s Guide
Networking is a fundamental part of Linux. As a stand-alone computer system it is impressive enough, but sooner or later you, the user, are going to want to send someone a file, mount a file system from another computer, read Usenet news, or search the World Wide Web.

