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Frame Relay In this lesson we cover Frame Relay. Frame Relay is the third encapsulation type that is also non-broadcast multi-access technology. You'll learn why this is important to know, what it supports, what OSI model layers are not supported and why. You'll also observe from our diagram what a customer edge router is, how it connects to other switch resources, the function of the Provider Edge Router how they interact to become a Permanent Virtual Circuit (PVC) and what a Hub and Spoke topology's purpose it.