Cisco Certified Network Associate (CCNA) Practice Exam

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Which bit of the Frame Relay frame header indicates congestion in the direction that the frame is traveling?

  1. Backward Explicit Congestion Notification (BECN)

  2. Forward Explicit Congestion Notification (FECN)

  3. Data Link Connection Identifier (DLCI)

  4. Virtual Circuit Identifier (VCI)

The correct answer is: Forward Explicit Congestion Notification (FECN)

The choice of Forward Explicit Congestion Notification (FECN) is indeed the correct option because it specifically serves to indicate congestion in the direction that the frame is traveling. When a Frame Relay frame encounters congestion in the network as it is being transmitted, the FECN bit is set to notify the receiving end that the network is experiencing congestion. This allows the receiving device to take appropriate action, such as slowing down transmission rates or implementing congestion control measures. In contrast, the Backward Explicit Congestion Notification (BECN) bit is utilized to indicate congestion in the reverse direction of transmission, alerting the sender of the frame about issues in the return path. The Data Link Connection Identifier (DLCI) and the Virtual Circuit Identifier (VCI) simply serve identification purposes for the virtual circuits established in the Frame Relay network. They do not provide any information regarding congestion state.

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