can't understand
 

hi i using redhat linux es 4

and when i read the RH253 Red Hat Linux Networking & Security Administration outlines

i found the following
Unit 7: Security Concerns and Policy


* Diagnostic Utilities
* Remote Service Detection
* Response Strategies and Resources


please i want to know and understand every title of these


please answer me quickly

Read the manuals found here;

http://www.redhat.com/docs/manuals/enterprise/

The three which covers this are;

Red Hat Enterprise Linux Introduction to System Administration
Red Hat Enterprise Linux Security Guide
Red Hat Enterprise Linux SELinux Guide

Basically how to secure your system(s) and detect/prevent unauthorized access with the tools/skills needed/used to monitor and respond.