Next-generation communication networks offer faster speeds and lower latency as well as higher capacity and bandwidth. While previous communication networks were focused on mobile phones, the future of networking starting from 5G, allows for an outburst of innovation and technological advancement of most industries, notably healthcare, manufacturing and automation. In order to fulfill the aforementioned requirements, technologies such as Software Defined Networking (SDN), Network Functions Virtualization (NFV), edge computing and virtualization are introduced, which make the future of networking vastly different from existing 4G networks. Due to the differentiation of 5G technology and architecture, the properties and security mechanisms of existing networks are hereby insufficient. Moreover, by adopting many different technologies, 5G networks not only take advantage of the benefits, but inherit the inherent both existing and future security challenges of those technologies as well.