After a fresh installation my network interfaces were not recognized. How to enable it?

Issue

• After a fresh installation of Red Hat Enterprise Linux, my network interfaces were not recognized.
• The output of ifconfig reports only the loopback interface

         # ifconfig
         lo        Link encap:Local Loopback  
                   inet addr:127.0.0.1  Mask:255.0.0.0
                   inet6 addr: ::1/128 Scope:Host
                   UP LOOPBACK RUNNING  MTU:16436  Metric:1
                   RX packets:16204 errors:0 dropped:0 overruns:0 frame:0
                   TX packets:16204 errors:0 dropped:0 overruns:0 carrier:0
                   collisions:0 txqueuelen:0 
                   RX bytes:91855053 (87.5 MiB)  TX bytes:91855053 (87.5 MiB)