SDN
As the term implies, software is used to provide NFs. It is done by using application programming interfaces (APIs) to communicate with network hardware and direct network traffic over a virtual overlay network. SDN aims to bring the benefits of cloud computing to network deployment and the management of networks by delivering them as code.
The devices, such as a router or switch, in a traditional network are only aware of the status of the network device next to it. SDN, on the other hand, can manage all the devices because of the centralization of network control.
Simply put, companies are using SDN because it’s a way to efficiently control network traffic and can be scaled as needed. SDN separates the control plane (that is, routing and packet forwarding functions) from the data plane (that is, underlying infrastructure). The brain of the SDN network is the centralized SDN controller, which offers a secure network since network administrators can set access...
