This video will explain how the Priority Flow Control (PFC) protocol operates in the Media Access Control (MAC) header. This is based on IEEE . PFC can facilitate lossless Ethernet. This can be very useful in Data Center environments, often referred to as Data center bridging (DCB). PCF provides a link level flow control mechanism that can be controlled independently for each frame priority. The goal of this mechanism is to ensure zero loss under congestion in DCB networks.