|4.01||Basic File Permissions||4.04||A Security-Enhanced Linux Primer|
|4.02||Access Control Lists and More||Two-Minute Drill|
|4.03||Basic Firewall Control||Q&A||Self Test|
Linux security starts with a concept known as “discretionary access controls.” They include the permissions and ownership associated with files and directories. Default permissions on new files depend on the umask. Permissions can go further with specialized bits. Linux discretionary access controls can be configured ...