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A packet traveling through the frame-relay network has been marked as DE or Discard Eligible and could be dropped in case of network congestion. What could be the reason for this behavior?
The BECN count is incrementing
The FECN count is incrementing
The traffic rate exceeds the allowed Local Access Rate
The traffic rate exceeds the allowed CIR
Each Virtual Circuit has a CIR (a guaranteed bandwidth to be delivered allowed by the service provider). When a traffic on a frame-relay network is marked as DE, they can be dropped in case of network congestion. The reason for this is that the traffic exceeds the allowed CIR or Committed Information Rate (due to bandwidth _bursting). The Local Access Rate is the maximum transfer rate of an interface defined by the clock rate (DCE side). FECN (Forward Explicit Congestion Notification) and BECN (Backward Explicit Congestion Notification) are both congestion avoidance mechanism. FECN notifies the destination DTE that a congestion occurred, and BECN notifies the originating/sender that a congestion occurred. (CCNA Routing and Switching Study Guide by Todd Lammle, pp. 925-930)
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