CentOS system administration
5.0(3)Debian system administration
5.0(3)Ubuntu system administration
5.0(3)Suse system administration
5.0(3)Essential Carrier Ethernet course
5.0(3)Definitive Samba for engineers
5.0(3)Essential Broadband access for engineers
5.0(3)Linux engineer certification 1 (LPIC-2)
5.0(3)Certified Wireless Network Administrator
5.0(3)