Red Hat Certified Specialist in Linux Diagnostics and Troubleshooting Exam

To help you prepare, the exam objectives highlight the task areas you can expect to see covered in the exam. Red Hat reserves the right to add, modify, and remove exam objectives. Such changes will be made public in advance.
Candidates for the Red Hat Certificate of Expertise in Linux Diagnostics and Troubleshooting should be able to:

Understand and employ general methods for troubleshooting

Collect system information to aid in troubleshooting
Consult documentation resources to aid in troubleshooting
Monitor systems for vital characteristics
Configure systems to send log messages to a centralized host

Diagnose and troubleshoot system start up issues

Identify and resolve service failures affecting boot
Regain root control of a system
Troubleshoot boot issues
Identify hardware and hardware problems
Manage kernel modules and their parameters

Diagnose and troubleshoot file system issues

Recover corrupted file systems
Recover mis-configured or broken LVM configurations
Recover data from encrypted file systems
Identify and fix iSCSI issues

Resolve package management issues

Resolve package management dependency issues
Recover a corrupted RPM database
Identify and restore changed files

Troubleshoot and fix network connectivity issues

Use standard tools to verify network connectivity
Identify and fix network connectivity issues
Inspect network traffic to aid troubleshooting

Diagnose application issues

Identify library dependencies for third-party software
Identify if an application suffers from memory leaks
Use standard tools to debug an application
Identify and fix issues related to SELinux

Identify and fix authentication issues

Identify and fix pluggable authentication module (PAM) issues
Identify and fix LDAP and Kerberos identity management issues

Gather information to aid third party investigation of issues

Create kernel crashdumps
Compile and execute SystemTap modules