classes:  lecturer. It is necessary to have practice sessions on the lab so that students have practical access to network devices, applying the knowledge of the theory learned to practice.  curriculum. It is necessary to have practice sessions on the lab so that students have practical access to network devices, applying the knowledge of the theory learned to practice.  facility. It is necessary to have practice sessions on the lab so that students have practical access to network devices, applying the knowledge of the theory learned to practice.  general. It is necessary to have practice sessions on the lab so that students have practical access to network devices, applying the knowledge of the theory learned to practice.