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Optional FCS Retention for Ethernet, Frame Relay, and HDLC/PPP Port Mode Current specifications leave payloads vulnerable to undetected accidental or deliberate alterations in the encapsulating network Provide end customers a service where transparency and non-alteration of end-to-end frames is guaranteed Security enhancement Optional for vendors and service providers Signaling is backward compatible with current drafts Nothing comes for free; adds the overhead of transporting the FCS end-to-end in every frame |