Next-generation 5G cellular networks will support various applications, including Industry 4.0, vehicle network, and IoT. The applications require different criterion. Network virtualization is developed to satisfy the requirements by combining software and hardware resources into a single software-based administrative entity. This course introduces several network virtualization technologies including software-defined networking, P4 language, network slicing, and network function virtualization. All topics start from the concept and then open source software is provided to build up virtualized networks. The new security issues for the new network technologies are also introduced. In addition, students can have a chance to operate their own experimental networks and work on related course projects.