CentOS system administration
5.0(3)Suse system administration
5.0(3)Ubuntu system administration
5.0(3)Red Hat system administration
5.0(3)OpenStack for NFV and SDN
5.0(3)Securing Microsoft systems
5.0(3)Definitive Kamailio for engineers
5.0(3)Definitive Kubernetes for engineers
5.0(3)