排错和系统维护
RHCE除了必须具有上述RHCT技能以外，还应该具有以下技能：
* use the rescue environment provided by first installation CD
* diagnose and correct boot failures arising from bootloader, module, and filesystem errors
* diagnose and correct problems with network services (see Installation and Configuration below for a list of these services)
* add, remove, and resize logical volumes
安装配置
RHCE除了必须具有上述RHCT技能以外，还必须掌握以下网络服务的配置和使用：
* HTTP/HTTPS
* SMB
* NFS
* FTP
* Web proxy
* SMTP
* IMAP, IMAPS, and POP3
* SSH
* DNS
对于以上每一种服务，RHCE必须具备如下技能：
* install the packages needed to provide the service
* configure the service to start when the system is booted
* configure the service for basic operation
* Configure host-based and user-based security for the service