You've read about the configuration files in the /etc/sysconfig hierarchy. Some are important for networking, and others are important for basic parameters such as the system clock, mouse, and keyboard. You also learned about a number of related networking commands, including ifup, ifdown, ifconfig, netstat, arp, and dhclient.
A number of important network client services are associated with Red Hat Enterprise Linux. CUPS supports the configuration of printers locally or over the network. With CUPS, the configuration files are stored primarily in the /etc/cups directory. However, it also includes a list of printers in /etc/printcap to accommodate sharing through Samba. You can edit the CUPS configuration files directly with Red Hat's Printer Configuration tool or the CUPS Web-based interface.
The cron and at daemons can help you manage when and how services start on your system. Finally, log files can be configured to collect data from any number of services.