The Red Hat Exam Prep guide says that you may have to diagnose and correct problems with network services during the Troubleshooting and System Maintenance portion of the RHCE exam. These are the same network services that you may need to configure during the Installation and Configuration portion of the same exam. Example scenarios and solutions are shown as follows. Needless to say, the solutions are far from complete: for example, firewalls and network configuration issues can prevent communication to any network service