Multiple choice

Which Frame Relay flow control mechanism is used to signal routers that they should reduce the flow rate of frames?

  1. DE

  2. BE

  3. CIR

  4. FECN

  5. CBIR
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

FECN (Forward Explicit Congestion Notification) is the Frame Relay mechanism used to signal congestion in the forward direction. When switches detect congestion, they set the FECN bit in frames heading toward the destination to inform routers to slow down their transmission rate. BECN (Backward Explicit Congestion Notification) would signal in the reverse direction, while CIR is the committed information rate, not a signaling mechanism.

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