Physical Security of a Linux Box
BIOS Firmware Security
Single User Mode Security (RHEL6,7)
Securing Boot Loader
Overview of PAM Security
Concepts of PAM
PAM Modules & Configurations
Control Flags in PAM
User Account Security
Forcing strong passwords
Security by Account Locked
Understanding Password Aging Policy
Overview of File & Directory Permission
Controlling files with ACL
General Security
Overview of Network Security
Securing SSHD
Linux Firewall
Port forwarding & Masquerading using firewall
Implementing Mandatory Access Control with SELinux
SELinux Security Concepts
Audit logs & Troubleshooting SELinux

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